Intermolecular Research Articles

Structure, vibrational characterization and SHG of the recrystallization product of L-phenylalanine from aqueous HCl solution

Direct recrystallization of L-phenylalanine from aqueous solution of HCl yields good quality single crystals of L-phenylalanine - L-phenylalaninium chloride (LPLP+Cl−). The compound crystallizes in the non-centrosymmetric space group P21 of the monoclinic system with two molecules in the asymmetric unit. This compound belongs to the ionic co-crystals. Both L-phenylalanine-L-phenylalaninium chloride molecules in the asymmetric unit are bound by a strong symmetric O–H‧‧‧O hydrogen bond with an O‧‧‧O distance of 2.43 Å. Such cationic dimers of (L-phenylalanine - L-phenylalanine) + interact with chloride anions forming two dimensional layers parallel to (001) plane. Hirshfeld surface analysis and the 2D fingerprint plot were used to visualize the many types of intermolecular interactions that govern the formation of supramolecular architecture. The compound was also characterized by vibrational spectroscopy. Molecular structure, vibration frequencies and vibration band intensities were interpreted by structure optimization and normal coordinate force field calculations based on density functional theory (DFT). Second harmonic generation (SHG) efficiency of the crystals LPLP+Cl− is about 50% of the standard KDP.

Dielectric characterisation and intermolecular interactions in propionitrile-dimethyl sulphoxide mixtures using a time domain reflectometry

ABSTRACT Complex permittivity spectra of propionitrile (PN) – dimethyl sulphoxide (DMSO) mixtures in the 10 MHz–30 GHz frequency range were investigated using time-domain reflectometry (TDR). The Debye model was employed to fit the measured dielectric spectra, allowing for the calculation of dielectric parameters like the static dielectric constant (ε 0 ) and relaxation time (τ). Excess dielectric constant (ε 0 E ) and excess inverse relaxation time (1/τ) E were subsequently calculated from the measured ε 0 and τ. The observed variations in these excess parameters provide evidence for intermolecular interactions within the PN-DMSO mixtures. Theoretical estimates of the ε 0 were obtained using Luzar’s hydrogen-bonded model.

Dynamic viscosity, interfacial tension and diffusion coefficient of n-hexane, cyclohexane, 2-methylpentane with dissolved CO2

In this work, n-hexane, cyclohexane and 2-methylpentane were selected to represent linear-alkane, cycloalkane and branched-alkane, respectively. Based on the dynamic light method (DLS), the viscosity, interfacial tension and diffusion coefficient of n-hexane/CO2, cyclohexane/CO2 and 2-methylpentane/CO2 systems under saturation condition were measured in order to explore the change trend of thermophysical properties of the systems with the same carbon atom number but different molecular structures. The experiments were conducted at the temperatures of 303, 343 and 383 K and at pressures up to 5.64 MPa. The expanded uncertainties（k = 2）of dynamic viscosity, interfacial tension and diffusion coefficient were 3 %, 3 % and 4.4 % respectively. The experimental results show that n-hexane and 2-methylpentane with similar molecular structure have more similar value of the properties. The effects of different alkane structures on system viscosity, interfacial tension, and diffusion coefficient were explained at the molecular level through radial distribution function, interface thickness, and CO2 coordination number. At 303.15 K and 4 MPa, the peak radial distribution function of CO2/cyclohexane is 1.845, which is greater than that of CO2/n-hexane and CO2/2-methylpentane molecules. It has been proven that the arrangement of CO2/cyclohexane is more orderly, resulting in higher viscosity and lower diffusion coefficient of the system. The interface thickness of CO2/cyclohexane is 6.13 nm which is smaller than CO2/n-hexane (7.53 nm) and CO2/2-methylpentane (6.3 nm). The smaller the interface thickness, the more compact the structure, the stronger the intermolecular forces, and the greater the interfacial tension. At 303.15 K and 2 MPa, the number of CO2 coordination sites within 1 nm around liquid phase alkanes is 3.96, which is smaller than 4.78 for cyclohexane and 6.62 for 2-methylpentane. Prove that the coordination number is directly proportional to the diffusion coefficient and inversely proportional to viscosity and interfacial tension.

Artificial neural network framework for the selection of deep eutectic solvents promoted enhanced oil recovery by interfacial tension reduction mechanism

Estimation of interfacial tension (IFT) and % reduction in IFT of Brazil and China regions’ heavy crude oil is employed by Artificial Intelligence (AI) led frameworks. The uniqueness of proposed approach lies in using AI frameworks that are constructed using Artificial Neural Network (ANN) and meta-heuristic algorithms i.e. Genetic Algorithm (GA) and Grey Wolf Optimization (GWO) forms three AI frameworks namely ANN, ANN-GA, and ANN-GWO is employed for IFT estimation of heavy oil and deep eutectic solvent-brine interface. The hyper-parameters of the frameworks are trained, validated, and tested over 18228 IFT data points obtained from the Omani heavy crude oil. The intermolecular interactions between oil, brine, and DES are obtained by generating surface segments in COnductor like Screening MOdel for Real Solvent (COSMO-RS) framework. The composition of brine, mole ratio of oil, DES, and temperature are other input parameters for AI model. The IFT estimation leads to the selection of 3 hydrophilic DESs capable of greater than 75 % IFT reduction and 14 hydrophilic DESs capable of 50–75 % IFT reduction. ANN-GWO scores best AI framework among 3 whereas ANN-GA fails to estimate IFT reduction greater than 50 %. Analysis of IFT with respect to mole fraction reveals the most suitable range of DES addition for IFT reduction.

Synthesis, spectral elucidation and DNA binding studies of cadmium(II) carboxylates with nitrogen donor heteroligands

A new series of novel homoleptic and heteroleptic Cd(II) complexes using cyclopropanecarboxylic acid (HL1) and cyclopentanecarboxylic acid (HL2) as main ligands and N-donor species like 2,2′-bipyridine (bpy), 1,10-phenanthroline (phen), and 2,9-dimethyl-1,10-phenanthroline (Me2phen) as co-ligands were prepared and characterized by FT-IR, multinuclear (1H and 13C) NMR, and UV–Visible spectroscopies. Furthermore, the crystal structure of the Cd(II) complex coordinated by cyclopentanecarboxylic acid (HL2) and 1,10-phenanthroline (phen) was explored by single crystal X-ray diffraction (SC-XRD) analysis. The crystal structure was binuclear, in which the coordination geometry around each cadmium center was distorted pentagonal bipyramidal coordination geometry. Various intermolecular interactions were accountable for stabilizing the supramolecular associations, which were seen by Hirshfeld surface analysis in terms of interatomic contacts. The spectroanalytical data of the synthesized complexes confirm the absence of the –OH band in the spectra of complexes as compared to the spectra of the free ligands, which favour the formation of complexes. The nature of complex-DNA interaction and the effect of the coordination of heteroligands on the binding strength of complexes were probed through UV–Visible spectroscopy and cyclic voltammetry. The obtained data confirm that the interaction of DNA with the complexes is dual: intercalation as well as groove binding. The DNA binding constants (Kb) and Gibb’s free energy changes (ΔG) were also determined for these complexes. This study aims to project effective drugs with the least harmful effects that could be useful for mankind against dreadful diseases.

Developing an Efficient Biobased Nucleating Agent with Antimicrobial Properties by Controlling the Conformation of Poly(lactic acid) Based on Intermolecular Forces

Developing an Efficient Biobased Nucleating Agent with Antimicrobial Properties by Controlling the Conformation of Poly(lactic acid) Based on Intermolecular Forces

Volumetric properties of CO2-loaded and unloaded 3-amino-1- propanol/1-amino-2-propanol/3-dimethylamino-1-propanol + N, N-dimethylacetamide binary mixture at (288.15 to 323.15) K and 101 kPa

ABSTRACT In this work, the densities of CO2-loaded and unloaded alkanolamine (1) + N, N-dimethylacetamide (DMAC) (2) mixtures were determined at temperature of (288.15 to 323.15) K and 101 kPa. The alkanolamines were primary amines, 3-amino-1-propanol (3A1P) and 1-amino-2-propanol (1A2P), and tertiary amine, 3-dimethylamino-1-propanol (3DMA1P). There CO2-unloaded 3A1P/1A2P/3DMA1P + DMAC binary systems with the whole concentration and two CO2-loaded 3A1P/1A2P + DMAC systems with alkanolamine mass fraction of (0.2, 0.3 and 0.4) were investigated. Based on the density values of CO2-unloaded binary systems, the thermal expansion coefficient ( α p ), excess molar volume ( V m E ), and apparent molar volume ( V φ , i ) were calculated and discussed in terms of intermolecular interactions and spatial structure. The V m E values were positive under the studied conditions and increased with the temperature, and the maximum followed the decreasing order of 1A2P + DMAC > 3DMA1P + DMAC > 3A1P + DMAC. Additionally, the V m E data were well fitted with the Redlich-Kister equation with a small standard deviation (σ ≤ 0.024). For the CO2-loaded systems, the density values were correlated with temperature and concentration using different empirical equations, and the average relative deviations (ARD%) were less than 0.299%.

Preparation and characterization of Iturin A/chitosan microcapsules and their application in post-harvest grape preservation

Iturin A (IA) encapsulated in chitosan (CS) microcapsules (IA/CS) underwent thorough physicochemical characterization using thermogravimetric analysis (TGA), Fourier-transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM). SEM confirmed the smooth, spherical morphology of the IA/CS microcapsules, while FTIR revealed complex intermolecular interactions between IA and CS. TGA demonstrated thermal stability within the 0–100 °C range, while particle size analysis revealed an average diameter of 553.4 nm. To evaluate IA/CS efficacy in post-harvest grape preservation, grapes were treated with sterile water (CK), 10 g/L CS, 0.1 g/L IA/CS, and 0.1 g/L chitosan empty microcapsules (CKM), then stored at 25 °C for 16 days. IA/CS significantly reduced decay and respiration intensity by 52.3 % and 23.8 %, respectively, compared to CK. IA/CS treatment also inhibited abscission rate, weight loss, firmness reduction, total soluble solids consumption, titratable acidity consumption, polyphenol oxidase, and peroxidase activities on par with CS treatment (p > 0.05), but performed better than CK (reductions of 26.9 %, 41.2 %, 25.8 %, 27.2 %, 24.2 %, 19.4 %, and 17.4 %, respectively) and CKM (p < 0.05). Sensory evaluation confirmed that IA/CS effectively suppressed decay, slowed post-harvest metabolic activity, and maintained grape quality. Therefore, IA/CS microcapsules offer a promising method for extending grape shelf life and preserving quality.

Efficient Molecular Array Control and Vapochromic Behavior Changes by Positional Isomer‐Dependent Molecular Building Blocks

AbstractStructurally flexible organic porous molecular arrays are promising for the development of vapochromic materials with superior detection performance. Exploring the photophysical control of vapochromic materials using these molecular arrays is important for the design of new vapochromic materials. However, difficulties arise in the formation and control of organic porous molecular arrays owing to weak and less‐oriented noncovalent forces and their tendency to arrange into energetically preferred high‐density configurations. Herein, an efficient strategy is presented to control molecular arrays by manipulating the shapes of donor–acceptor–donor system‐based molecular building blocks using positional isomerism and report on the correlation between controlled molecular arrays and vapochromic behavior. Depending on their shape (Z‐shaped, quasi‐Z‐shaped, or linear shape), the building blocks formed different molecular arrays that controlled the intermolecular interactions and void volumes. This led to differences in the final microstructural morphologies. Consequently, they exhibited different vapochromic behaviors, and an in‐depth understanding of the correlation between the molecular arrays and vapochromism/vapofluorochromism is obtained.

Metronidazole-Picric acid salt formation: Synthesis, characterization, Hirshfeld surface analysis, single crystal X-ray diffraction, computational studies, and molecular docking studies against Clostridioides difficile

The salt formation of metronidazole (MET) and picric acid (PA) is obtained via slow evaporation of their mixture in methanol which afforded a novel organic salt, C6H10N3O3+⋅C6H2N3O7- (METPA). The structure of METPA salt was analyzed using single crystal X-ray diffraction. METPA crystallizes in the triclinic space group P-1 with cell dimensions: a = 8.2446(1), b = 9.1843(1), c = 11.5832(2) Å, α = 106.190(1)°, β = 99.483(1)°, γ = 106.635(1)°, Volume (Å3) = 778.02(2) and Z = 2. The formation of METPA salt was analyzed by comparing the IR spectrum of MET, PA and METPA salt. In order to visualize the intermolecular interactions in the crystal of METPA salt, Hirshfeld surface analysis was employed. QTAIM calculations were performed using the AIMALL program package to estimate the strength of hydrogen bonding interactions in terms of bond critical points (BCP) and ring critical points (RCP). Molecular docking of the MET and METPA was conducted against three toxins of Clostridioides difficile such as C. difficile toxin A (TcdA), C. difficile toxin B (TcdB), C. difficile transferase (CDT). The results showed that the docking score calculated based on the knowledge-based iterative scoring function ITScore-PP indicates that METPA with higher negative value of docking score in case of all three toxins when compared to MET. This shows that the binding model of METPA salt is more favorable than MET.

Enhancing the stability of O/W emulsions by the interactions of casein/carboxymethyl chitosan and its application in whole nutrient emulsions

The influence of Carboxymethyl chitosan (CMCS) on the emulsification stability mechanism of casein (CN) and its effects on the stability of whole nutrient emulsions were investigated. The complex solutions of CN and CMCS were prepared and the turbidity, ultraviolet (UV) absorption spectrum, fluorescence spectrum, circular dichroism (CD) spectrum, Fourier transform infrared (FTIR) spectrum, interfacial tension and microstructural observations were used to study the inter-molecular interaction of CMCS and CN. The effects of CMCS on the emulsion stability of CN were further analyzed by particle size, ζ-potential, instability index and rheological properties. Moreover, the accelerated stability of whole nutrient emulsions prepared by CMCS and CN was evaluated. The results revealed that CN-CMCS complexes were mainly formed by hydrogen bonding. The stability of the CN-CMCS composite emulsions were improved, as evidenced by the interfacial tension decreasing from 165.96 mN/m to 158.49 mN/m, the particle size decreasing from 45.85 μm to 12.98 μm, and the absolute value of the potential increasing from 29.8 mV to 33.5 mV. The stability of whole nutrient emulsion was also significantly enhanced by the addition of CN-CMCS complexes. Therefore, CN-CMCS complex could be served as a novel emulsifier to improve the stability of O/W emulsions.

Boosting Organic Solar Cells to Over 18% Efficiency through Dipole-Dipole Interactions in Fluorinated Nonfused Ring Electron Acceptors.

This study successfully designed and synthesized two nonfused ring electron acceptors, 412-6F and 412-6Cl, modified with fluorine and chlorine substituents, respectively. Single-crystal analysis revealed that 412-6F possesses a planar molecular backbone and exhibits pronounced dipole-dipole interactions between the fluorine atoms on the lateral phenyl groups and the carbonyl oxygen atoms on the end groups. This specific interaction promotes dense end-group stacking, leading to a reduced interlayer spacing. Improved crystallinity and coherence length are observed in the D18:412-6F blend film. Conversely, 412-6Cl adopts a more distorted configuration and lacks these interactions. As a result, the organic solar cell (OSC) based on D18:412-6F achieved a remarkable power conversion efficiency of 18.03%, surpassing the performance of the D18:412-6Cl OSC. This underscores the importance of designing novel acceptors with beneficial intermolecular interactions to enhance OSC efficiency, thus providing a new direction for organic photovoltaic advancement.

The effect of constant electric field on the crack growth process of aluminum nanosheet using molecular dynamics simulation

Aluminum nanosheets are a form of Al nanoparticle that have been recently manufactured on an industrial scale and have a variety of uses. Al nanoparticles are extensively used in a variety of sectors, including aerospace, construction, medical, chemistry, and marine industries. Crack propagation in various constructions must be investigated thoroughly for structural design purposes. Cracks in nanoparticles may occur during the production of nanosheets (NSs) or when different mechanical or thermal pressures were applied. In this work, the effect of a continuous electric field on the fracture formation process of aluminum nanosheets was investigated. For this study, molecular dynamics simulation and LAMMPS software were used. The effects of various electric fields on several parameters, including as stress, velocity (Velo), and fracture length, were explored, and numerical data were retrieved using software. The results show that the amplitude of the electric field parameter affected the atomic development of modeled Al nanosheets throughout the fracture operation. This effect resulted in atomic resonance (amplitude) fluctuations, which affected the mean interatomic forces and led the temporal evolution of atoms to converge to certain specified initial conditions. The crack length in our modeled samples ranged from 22.88 to 32.63 Å, depending on the electric field parameter (0.1–1 V/Å). Finally, it was determined that the crack growth of modeled Al nanosheets may be controlled using CEF parameters in real-world situations.

Impact of konjac glucomannan with varied deacetylation degrees on plant-based meat analogue: Study on the gel properties, digestibility, and microstructure

Polysaccharides are widely used to improve the quality of plant-based meat analogue (PMA). In this study, four kinds of konjac glucomannan (KG) with different deacetylation degrees (DD) were prepared, namely KG1 (native KG, DD = 0.00 %), KG2 (DD = 41.40 %), KG3 (DD = 80.01 %) and KG4 (DD = 89.07 %), and their effects on the quality of PMA were studied. Results manifested that KG3 improved the hardness (from 3017.16 g to 3307.16 g) and protein digestibility (from 49.65 % to 53.01 %) of PMA without reducing the P21, KG2 and KG4 were less effective than KG3, while KG1 led to a significant decline in the hardness and protein digestibility of PMA. The rheological properties and intermolecular force analysis showed that the partially deacetylated KG was more conducive to improving the G' of the protein system during heating and the proportion of covalent bonds in PMA. These findings suggested that partially deacetylated KG was more promising than native or highly deacetylated KG in PMA. Furthermore, scanning electron microscopy revealed that the morphology of KG gradually changed from fine filaments, to coarse filaments, short filaments and granules as DD increased. This study provides a theoretical basis for the application of partially deacetylated KG in PMA.

Volumetric and ultrasonic studies of molecular interactions in binary mixtures of N,N-dimethylacetamide with some polyethylene glycols at temperatures from 293.15 to 323.15 K

The intermolecular interactions in N,N-dimethylacetamide (DMA) + polyethylene glycol (PEG) mixtures have been examined from the measurements of the densities, ρ and speeds of sound, u of DMA + PEG 200 or PEG 300 or PEG 400 or PEG 600 mixtures over the entire mole fraction range at temperatures, T = (293.15–323.15) K and atmospheric pressure. Various excess parameters, viz., excess molar volume, excess isentropic compressibility, excess intermolecular free length, excess speed of sound, excess molar isentropic compressibility and excess acoustic impedance were evaluated using measured data. These excess properties were correlated with the Redlich–Kister equation. In addition, the partial molar volume and compressibility; excess partial molar volume and compressibility of the components over the entire composition range; and partial molar volume and compressibility and excess partial molar volume and compressibility of the components at infinite dilution have also been calculated. These evaluated parameters have been interpreted by means of prevailing intermolecular interactions in these mixtures. The presence of strong intermolecular interactions among DMA and PEG molecules have been revealed from the evaluated parameters of these mixtures. The speeds of sound were predicted theoretically using scaled particle theory and compared with experimental values. FT-IR spectra of pure DMA, PEG 200 and their equimolar mixtures were also recorded and analysed for better understanding of prevailing intermolecular interaction.

Porous Supramolecular Crystalline Probe that Detects Non-Covalent Interactions Involved in Molecular Recognition of Furanic Compounds.

Selective separation and conversion of furan-based biomass-derived compounds, which are closely related to biorefineries, is currently an important issue. To improve their performance, it is important to deepen the understanding of non-covalent interactions that act on the molecular recognition of furanic compounds on separation or catalyst matrices. Here, a new method is reported to comprehensively visualize such intermolecular interactions using a porous supramolecular crystalline probe with polar and non-polar binding sites within a low-symmetric nanochannel consisting of four isomeric PdII 3-macrocycles. Single-crystal X-ray diffraction analysis of the crystals including 5-hydroxymethylfurfural, furfural, furfuryl alcohol, or 2-acetylfuran reveals a variety of interactions involving their furan rings and polar substituents. It is also found that cooperative and competitive effects between guest and solvent molecules significantly change their recognition mode.

PREPARATION, CHARACTERIZATION AND ANALYSIS OF NANOSCALE MORPHOLOGY OF POLY(VINYL ALCOHOL) FILMS ASSOCIATED WITH SILK FIBROIN FUNCTIONALIZED WITH COPAÍBA OLEORESIN

Biodegradable films based on poly(vinyl alcohol) (PVA) and bioactive substances have been receiving great attention in the food industry, as they offer an eco-friendly alternative to conventional packaging. In this context, we synthesized PVA (PVAF) films containing silk fibroin (SF) formulations functionalized with copaiba oleoresin (CO) for use as bioactive packaging. Four different formulations were prepared using the casting method, varying the SF-CO concentrations from 0 to 15% (v/v) in the PVA matrix. The samples were characterized regarding morphology, nanotexture, physicochemical, and barrier properties. SEM images revealed the uniform morphology of the films, and AFM data allowed the quantification of surface characteristics such as uniformity and homogeneity, confirming the uniform distribution of SF-OC in the PVA matrix. All films showed high water absorption power (more than twice their mass weight), and the incorporation of SF-CO did not change the water vapor permeability rate of PVAF. In contrast, the solubility of PVAF decreases with SF-CO content. FTIR and UV-vis spectra confirmed the presence of SF-CO in PVAF and indicated possible intermolecular interactions between PVA and SF-CO. Finally, our findings suggest that the incorporation of SF-CO into the PVA matrix is a viable alternative for producing eco-friendly packaging.

Polar Alternating Cations Intercalated Hybrid Perovskite with Iodine‐Substituted Spacers Toward Efficient Passive X‐Ray Detection

Abstract2D hybrid perovskites, with their high X‐ray absorption and extended carrier transport, present excellent promise for efficient direct X‐ray detection. However, most of the current devices require external bias voltage, which results in the need for significant energy consumption and severe ion migration, therefore, it is urgent to develop new types of materials for achieving efficient passive X‐ray detection. Herein, two novel chiral polar alternating cations intercalation (ACI)‐type hybrid perovskite materials, named (R/S‐PPA)(IEA)PbBr4 (1‐R/S, (R/S)‐PPA = R/S‐1‐phenylpropylamine; IEA = iodoethylamine), are constructed by integrating the chiral aromatic spacer R/S‐PPA and the iodine‐substituted spacer IEA. Various intermolecular interactions, such as I···I, C─H···I, π···π interactions, are introduced due to the introduction of I‐substituted chain amines, which effectively suppresses ion migration and thus lead to improved operational stability. The device constructed along the polar axis displays superior X‐ray detection performance, such as relatively high sensitivity and an ultra‐low limit of detection (LoD) of 3.0 nGy s−1, making it the first chiral ACI‐type perovskite material for realizing efficient passive X‐ray detection. Furthermore, 1‐R also presents low dark current drift and exceptional irradiation stability. This work provides new thought for using novel ACI‐type polar perovskite for high‐performance passive direct X‐ray detection.

The effect of protein-glutaminase from Chryseobacterium proteolyticum on physicochemical and functional properties of high-temperature soybean meal protein

Protein-glutaminase (EC 3.5.1.44, PG) can significantly improve the functional properties of food proteins. However, the low yield of PG has limited industrial applications. Results showed that 0.02 % tea saponin could increase the PG yield by 18.93 %. The transcription level of the PG gene was significantly enhanced, which promoted the extracellular secretion of PG through an increase in membrane permeability. On this basis, PG was used to modify high-temperature soybean meal protein (HSMP) due to its poor properties. In this study, the deamidation degree (DD) of PG-modified HSMP was optimized to 58.61 % by the response surface method. HSMP with different DD was prepared and its physicochemical and functional properties were studied. After PG treatment, the intermolecular repulsive force of HSMP increased, the particle size distribution became uniform, and the solution system was more stable. In addition, the surface morphology of HSMP gradually became loose and porous. The solubility of HSMP significantly improved, reaching 11.34 times that of untreated HSMP at pH 5.00. Meanwhile, the emulsifying and foaming capacity of HSMP significantly improved, but the foaming stability was reduced.

Narrowband clusteroluminescence with 100% quantum yield enabled by through-space conjugation of asymmetric conformation

Different from traditional organic luminescent materials based on covalent delocalization, clusteroluminescence from nonconjugated luminogens relies on noncovalent through-space conjugation of electrons. However, such spatial electron delocalization is usually weak, resulting in low luminescent efficiency and board emission peak due to multiple vibrational energy levels. Herein, several nonconjugated luminogens are constructed by employing biphenyl as the building unit to reveal the structure-property relationship and solve current challenges. The intramolecular through-space conjugation can be gradually strengthened by introducing building units and stabilized by rigid molecular skeleton and multiple intermolecular interactions. Surprisingly, narrowband clusteroluminescence with full width at half-maximum of 40 nm and 100% efficiency is successfully achieved via an asymmetric conformation, exhibiting comparable performance to the traditional conjugated luminogens. This work realizes highly efficient and narrowband clusteroluminescence from nonconjugated luminogens and highlights the essential role of structural conformation in manipulating the photophysical properties of unconventional luminescent materials.