2D Motifs Research Articles

Art inheritance: Revitalizing traditional material culture motifs through innovative graphic design and artistic expression

Orang Ulu's culture and traditions are adapting to modernization and finding new ways to thrive amidst changes that have influenced various aspects of their lives and material culture in Malaysia. This paper highlights the exciting potential for Orang Ulu’s material culture to flourish through the development of motif design and presents the first Orang Ulu woven fabric in a 3D graphical view. Motif design is a beautiful way to preserve and promote the rich cultural identity of Orang Ulu through graphical expression. It also has the potential to boost the local economy by providing employment opportunities for skilled artisans. The paper highlights the importance of Orang Ulu motif design in their material culture, emphasizes the value of art as a tool for cultural expression and preservation, and outlines the development of these designs through graphic design and research. This study has adopted mixed-methods research to achieve its goal. The accomplished method for this study is categorized into three phases: research and inspiration in Orang Ulu's material culture market; 2D motif design conceptualization; and 3D artistic creation. This study recommends exploring the potential for incorporating Orang Ulu motifs in apparel products. The findings showcase the exciting potential for small and medium enterprises to preserve and promote the Orang Ulu cultural heritage and sustainability while providing economic benefits for the community.

High-throughput screening and machine learning classification of van der Waals dielectrics for 2D nanoelectronics

Van der Waals (vdW) dielectrics are promising for enhancing the performance of nanoscale field-effect transistors (FETs) based on two-dimensional (2D) semiconductors due to their clean interfaces. Ideal vdW dielectrics for 2D FETs require high dielectric constants and proper band alignment with 2D semiconductors. However, high-quality dielectrics remain scarce. Here, we employed a topology-scale algorithm to screen vdW materials consisting of zero-dimensional (0D), one-dimensional (1D), and 2D motifs from Materials Project database. High-throughput first-principles calculations yielded bandgaps and dielectric properties of 189 0D, 81 1D and 252 2D vdW materials. Among which, 9 highly promising dielectric candidates are suitable for MoS2-based FETs. Element prevalence analysis indicates that materials containing strongly electronegative anions and heavy cations are more likely to be promising dielectrics. Moreover, we developed a high-accuracy two-step machine learning (ML) classifier for screening dielectrics. Implementing active learning framework, we successfully identified 49 additional promising vdW dielectrics. This work provides a rich candidate list of vdW dielectrics along with a high-accuracy ML screening model, facilitating future development of 2D FETs.

3D Hierarchical-Architectured Nanoarray Electrode for Boosted and Sustained Urea Electro-Oxidation.

Exploring active and durable Ni-based materials with optimized electronic and architectural engineering to promote the urea oxidation reaction (UOR) is pivotal for the urea-related technologies. Herein a 3D self-supported hierarchical-architectured nanoarray electrode (CC/MnNi@NC) is proposed in which 1D N-doped carbon nanotubes (N-CNTs) with 0D MnNi nanoparticles (NPs) encapsulation are intertwined into 2D nanosheet aligned on the carbon cloth for prominently boosted and sustained UOR electrocatalysis. From combined experimental and theoretical investigations, Mn-alloying can regulate Ni electronic state with downshift of the d-band center, facilitating active Ni3+ species generation and prompting the rate-determining step (*COO intermediate desorption). Meanwhile, the micro/nano-hierarchical nanoarray configuration with N-CNTs encapsulating MnNi NPs can not only endow strong operational durability against metal corrosion/agglomeration and enrich the density of active sites, but also accelerate electron transfer, and more intriguingly, promote mass transfer as a result of desirable superhydrophilic and quasi-superaerophobic characteristics. Therefore, with such elegant integration of 0D, 1D and 2D motifs into 3D micro/nano-hierarchical architecture, the resulting CC/MnNi@NC can deliver admirable UOR performance, favorably comparable to the best-performing UOR electrocatalysts reported thus far. This work opens a fresh prospect in developing advanced electrocatalysts via electronic manipulation coupled with architectural engineering for various energy conversion technologies.

Self-assembled H-bonded supramolecular interactions in monomeric complex [Mg(H2O)6].L2.2bipy.H2O; [LH = 2-amino-5-nitrobenzoic acid, bipy = 4,4′-bipyridine]]]]: Joint theoretical calculations and Hirshfeld surface analysis

The prepared monomeric H-bonded complex [Mg(H2O)6].L2.2bipy.H2O I [LH = 2-amino-5-nitrobenzoic acid, bipy = 4,4′-bipyridine], has been characterized by single-crystal X-ray crystallography, IR spectroscopy, elemental analysis, and thermal stability. This complex has been solved crystallographically in the monoclinic centrosymmetric space group (P21/n). In the molecular structure, the Mg2+ ion is connecting with six water molecules through coordination whereas L, bipy, and one lattice water are present as counter atoms. The L is behaving as a counter anion and the overall charge of this H-bonded complex is stabilized by [Mg(H2O)6]2+cationic unit. The stability of I is attained due to collective coordination and H-bonding interactions which are responsible for organizing it into a supramolecular 2D motif. Hirshfeld surface analysis has been applied to scrutinize supramolecular H-bonding interactions as well as short or weak contacts and then compared the results with single-crystal X-ray data. The fingerprint plots demonstrate that the huge number of weak non-bonding interactions as compare to strong contacts is important for stabilizing the crystal packing. DFT calculations demonstrated that the thermodynamic stabilization of I may be attributed to the existence of inter-and intramolecular hydrogen interaction. NBO–Second-order perturbation theory analysis, displayed detraction in positive charge on Mg2+ ion upon coordination with surrounding water molecules.

Hydroxy Derivatives of Poststerone and Its Nontrivial 13(14→8)-Abeo-analogues: Synthesis, Crystal Packing, and Intermolecular Hydrogen Bonds

ABSTRACT The 6,20-dioxo-Δ2,3-pregnane and 6,20,14-trioxo-13(14→8)-abeo-pregnane steroid hydroxyl derivatives are synthesized via the reduction with metal hydrides (NaBH4, LiAlH4, and L-Selecride). The structures of the derivatives were elucidated with single-crystal X-ray diffraction analysis, MALDI TOF/TOF mass spectrometry, and 1D and 2D NMR spectroscopy. The topological analysis with a QTAIM approach, the analysis of molecular electrostatic potentials mapped on a Hirshfeld surface, and the CLP-PIXEL method show unequivocally that there is a complex network of intramolecular and intermolecular interactions in the crystals of the pregnane steroids. The molecules of 20(R)-2β,3β-dimesyloxy-14α,20-dihydroxy-5β-pregn-7-en-6-one 2 form a 2D motif (network) due to strong O–H...O hydrogen bonds. The (8R)-8,13-cyclo-13,14-seco-5β-pregn-2-ene-6,14,20-trione 4 and 6α,8R-8,13-cyclo-13,14-seco-5β-pregn-2(3)-en-6-hydroxy-14,20-dione 9 provide two-dimensional network of a brick wall type in their crystals due to weak С–Н...О contacts, whereas 6α,14α,8R,20R-8,13-cyclo-13,14-seco-5β-pregn-2(3)-en-6,14,20-triol 10 forms one-dimensional network (chains) in its crystals owing to strong O–H...O intermolecular interactions. When the number of hydroxyl groups in abeo-steroid increases, the contribution of O...H contacts to the Hirshfeld surface decreases from 26 to 11%.

3D-to-2D Dimensional Reduction for Exploiting a Multilayered Perovskite Ferroelectric toward Polarized-Light Detection in the Solar-Blind Ultraviolet Region.

Polarized-light detection in solar-blind ultraviolet region is indispensable for optoelectronic applications, whereas new 2D candidates targeted at solar-blind UV range remain extremely scarce. 2D hybrid perovskite ferroelectrics that combine polarization and semiconducting properties are of increasing interest. Here, using the 3D-to-2D dimensional reduction of CH3 NH3 PbCl3 , we designed a multilayered hybrid perovskite ferroelectric, (CH3 CH2 NH3 )2 (CH3 NH3 )2 Pb3 Cl10 , which shows spontaneous polarization and a high Curie temperature (390 K) comparable with that of BaTiO3 (393 K). The wide band gap (ca. 3.35 eV) and anisotropic absorbance stemming from its intrinsic 2D motif, greatly favor its polarization-sensitive activity in UV region. The device displays excellent polarization-sensitive behavior under 266 nm, along with a large dichroic ratio (ca. 1.38) and high on/off current ratio (ca. 2.3×103 ).

3D‐to‐2D Dimensional Reduction for Exploiting a Multilayered Perovskite Ferroelectric toward Polarized‐Light Detection in the Solar‐Blind Ultraviolet Region

AbstractPolarized‐light detection in solar‐blind ultraviolet region is indispensable for optoelectronic applications, whereas new 2D candidates targeted at solar‐blind UV range remain extremely scarce. 2D hybrid perovskite ferroelectrics that combine polarization and semiconducting properties are of increasing interest. Here, using the 3D‐to‐2D dimensional reduction of CH3NH3PbCl3, we designed a multilayered hybrid perovskite ferroelectric, (CH3CH2NH3)2(CH3NH3)2Pb3Cl10, which shows spontaneous polarization and a high Curie temperature (390 K) comparable with that of BaTiO3 (393 K). The wide band gap (ca. 3.35 eV) and anisotropic absorbance stemming from its intrinsic 2D motif, greatly favor its polarization‐sensitive activity in UV region. The device displays excellent polarization‐sensitive behavior under 266 nm, along with a large dichroic ratio (ca. 1.38) and high on/off current ratio (ca. 2.3×103).

Alkyl-Substituted Selenium-Bridged V-Shaped Organic Semiconductors Exhibiting High Hole Mobility and Unusual Aggregation Behavior.

Toward the development of high-performance organic semiconductors (OSCs), carrier mobility is the most important requirement for next-generation OSC-based electronics. The strategy is that OSCs consisting of a highly extended π-electron core exhibit two-dimensional (2D) aggregated structures to offer effective charge transport. However, such OSCs, in general, show poor solubility in common organic solvents, resulting in limited solution processability. This is a critical trade-off between the development of OSCs with simultaneous high carrier mobility and suitable solubility. To address this issue, herein, five-membered ring-fused selenium-bridged V-shaped binaphthalene with decyl substituents (C10-DNS-VW) is developed and synthesized by an efficient method. C10-DNS-VW exhibits significantly high solubility for solution processes. Notably, C10-DNS-VW forms a one-dimensional π-stacked packing motif (1D motif) and a 2D herringbone (HB) packing motif (2D motif), depending on the crystal growth condition. On the other hand, the fabrication of thin films by means of both solution process and vacuum deposition techniques forms only the 2D HB motif. External stress tests such as heating and exposure to solvent vapor indicated that 1D and 2D motifs could be synergistically induced by the total balance of intermolecular interactions. Finally, the single-crystalline films of C10-DNS-VW by solution process exhibit carrier mobility up to 11 cm2 V-1 s-1 with suitable transistor stability under ambient conditions for more than two months, indicating that C10-DNS-VW is one of the most promising candidates for breaking the trade-off in the field of solution-processed technologies.

Supramolecular networks supported by the anion...π linkage of Keggin-type heteropolyoxotungstates.

Anion...π interactions are newly recognized weak supramolecular forces which are relevant to many types of electron-deficient aromatic substrates. Being less competitive with respect to conventional hydrogen bonding, anion...π interactions are only rarely considered as a crystal-structure-defining factor. Their significance dramatically increases for polyoxometalate (POM) species, which offer extended oxide surfaces for maintaining dense aromatic/inorganic stacks. The structures of tetrakis(caffeinium) μ12-silicato-tetracosa-μ2-oxido-dodecaoxidododecatungsten trihydrate, (C8H11N4O2)4[SiW12O40]·3H2O, (1), and tris(theobrominium) μ12-phosphato-tetracosa-μ2-oxido-dodecaoxidododecatungsten ethanol sesquisolvate, (C7H9N4O2)3[PW12O40]·1.5C2H5OH, (2), support the utility of anion...π interactions as a special kind of supramolecular synthon controlling the structures of ionic lattices. Both caffeinium [(HCaf)+ in (1)] and theobrominium cations [(HTbr)+ in (2)] reveal double stacking patterns at both axial sides of the aromatic frameworks, leading to the generation of anion...π...anion bridges. The latter provide the rare face-to-face linkage of the anions. In (1), every square face of the metal-oxide cuboctahedra accepts the interaction and the above bridges yield flat square nets, i.e. {(HCaf+)2[SiW12O40]4-}n. Two additional cations afford single stacks only and they terminate the connectivity. Salt (2) retains a two-dimensional (2D) motif of square nets, with anion...π...anion bridges involving two of the three (HTbr)+ cations. The remaining cations complete a fivefold anion...π environment of [PW12O40]3-, acting as terminal groups. This single anion...π interaction is influenced by the specific pairing of (HTbr)+ cations by double amide-to-amide hydrogen bonding. Nevertheless, invariable 2D patterns in (1) and (2) suggest the dominant role of anion...π interactions as the structure-governing factor, which is applicable to the construction of noncovalent linkages involving Keggin-type oxometalates.

The application of jBatik software for batik products

Batik is one of Indonesia’s cultural heritage that must be preserved. jBatik is an application that introduces the process of making batik motif designs using technology. The purpose of this study is to apply the technology for making batik motif designs in the batik industry. the use of technology in batik designs is expected to facilitate the making of motif designs and provide more creative quality craftsmen. and can prepare for industry challenges of the 4.0 era. The technology used is jBatik is an application to make batik motifs with fractal principles. The paper writing method is in the form of jBatik application analysis which is already available on the internet. this finding shows that the process of making batik motif designs using jBatik application is faster and more effective by producing two types of motifs namely 2D and 3D motifs depending on the parameters used. The use of jBatik application is practical and facilitated by various variations of batik motifs.

Syntheses, Structures, and Catalytic Hydrocarbon Oxidation Properties of N-Heterocycle-Sulfonated Schiff Base Copper(II) Complexes

Reaction of the o-[(o-hydroxyphenyl)methylideneamino]benzenesulfonic acid (H2L) (1) with CuCl2·2H2O in the presence of pyridine (py) leads to [Cu(L)(py)(EtOH)] (2) which, upon further reaction with 2,2’-bipyridine (bipy), pyrazine (pyr), or piperazine (pip), forms [Cu(L)(bipy)]·MeOH (3), [Cu2(L)2(μ-pyr)(MeOH)2] (4), or [Cu2(L)2(μ-pip)(MeOH)2] (5), respectively. The Schiff base (1) and the metal complexes (2–5) are stabilized by a number of non-covalent interactions to form interesting H-bonded multidimensional polymeric networks (except 3), such as zigzag 1D chain (in 1), linear 1D chain (in 2), hacksaw double chain 1D (in 4) and 2D motifs (in 5). These copper(II) complexes (2–5) catalyze the peroxidative oxidation of cyclic hydrocarbons (cyclooctane, cyclohexane, and cyclohexene) to the corresponding products (alcohol and ketone from alkane; alcohols, ketone, and epoxide from alkene), under mild conditions. For the oxidation of cyclooctane with hydrogen peroxide as oxidant, used as a model reaction, the best yields were generally achieved for complex 3 in the absence of any promoter (20%) or in the presence of py or HNO3 (26% or 30%, respectively), whereas 2 displayed the highest catalytic activity in the presence of HNO3 (35%). While the catalytic reactions were significantly faster with py, the best product yields were achieved with the acidic additive.

Out-of-plane doming behaviour from constrained auxetics

Auxetics expand laterally when uniaxially stretched. In many cases, this behaviour has been attributed to the interplay between the geometry of the system and its deformation mechanism. This work revisits a class of 2D motifs, the so-called chiral honeycombs, which are closely associated with auxetic behaviour. More specifically, we show that systems based on this motif, particularly those having a Poisson’s ratio of −1, can be engineered with specific constraints that limit the in-plane expansion, with the result that on inducing deformation of the systems, these veer out-of-plane to form dome-like structures. This effect is demonstrated in simple prototypes and it is shown through a simplified mathematical model that the extent of curvature can be controlled through the various parameters that describe such structures.

A Combined Theoretical Calculation and Hirshfeld Surface Analysis of Cooperative Non‐covalent Interactions in the Crystal Packing in [Cu(L1)2(EDA)

The monomeric complex [Cu(L1)2(EDA)] (I) [L1 = 2,4‐dinitrobenzoic acid, EDA = ethylenediamine), was solved in orthorhombic space group (Pbca) and characterized by elemental analysis, IR spectroscopy, powder XRD analysis, and single‐crystal X‐ray crystallography, in addition to photoluminescence and thermal stability investigation. The Cu2+ ion is connecting with two L1 through monodentate mode of coordination and two nitrogen atoms from EDA. I is associated through cooperative non‐covalent interactions, which are also responsible for the strengthening of the molecular assembly and organize it into a supramolecular 2D motif. Hirshfeld surface analysis was also applied to investigate the cooperative non‐covalent supramolecular interactions and the results were compared with the single‐crystal X‐ray diffraction data. To get clear insights into the both species, electronic properties such as HOMO‐LUMO, electronic chemical potential and other derived parameters were also highlighted using DFT calculations at M06‐2X/ 6‐31G** level of theory. The observed photoluminescence of complex I arises mainly from an excited LLCT state with small MLCT contributions (from Cu2+ to the unoccupied p orbital of L1). The presented work exhibits another example of the utility and prosperity of such kinds of subtle information and features especially, and for complex I at molecular level, generally.

Regioselective Synthesis of Eight-Armed Cyclosiloxane Amphiphile for Functional 2D and 3D Assembly Motifs.

A crystalline tetramethylcyclotetrasiloxane (TMCS)-derived amphiphile was regioselectively synthesized with eight peripheral hydrophilic amide groups and hydrophobic dodecyl chains by Pt(0)-catalyzed hydrosilylation and amidation reactions. The as-synthesized materials showed ordered lamellar structure formation in the powder form. It also exhibits superior two-dimensional (2D) monolayer formation properties at the air-water interface with unexpectedly high collapse surface pressure and elastic modulus. The monolayers act as two-dimensional building blocks with finely controllable thickness on a several nanometer scale irrespective of the substrate type and properties. The amphiphile forms nanofibers spontaneously by good-poor solvent strategies, which contributes to porous three-dimensional (3D) structures possessing superhydrophobic surface wettability.

2D Motif Basis Applied to the Classification of Digital Images

The classification of raw data often involves the problem of selecting the appropriate set of features to represent the input data. Different types of features can be extracted from the input dataset, but only some of them are actually relevant for the classification process. Since relevant features are often unknown in real-world problems, many candidate features are usually introduced. This degrades both the speed and the predictive accuracy of the classifier due to the presence of redundancy in the set of candidate features. Recently, a special class of bidimensional motifs, i.e. 2D motif basis has been introduced in the literature. 2D motif basis showed to be powerful in capturing the relevant information of digital images, also achieving good performances for image compression. Here, we investigate the effectiveness of 2D motif basis, when they are used as features for image classification. We embed such features in a bag-of-words model, and then we apply K-Nearest Neighbour for the classification step. Results obtained on both benchmark image datasets and video frames datasets show that, despite the pixel-level nature of the considered features, the achieved accuracy is high and comparable with that of other techniques proposed in the literature.

Superior visible light hydrogen evolution of Janus bilayer junctions via atomic-level charge flow steering.

Although photocatalytic hydrogen evolution (PHE) is ideal for solar-to-fuel conversion, it remains challenging to construct a highly efficient PHE system by steering the charge flow in a precise manner. Here we tackle this challenge by assembling 1T MoS2 monolayers selectively and chemically onto (Bi12O17) end-faces of Bi12O17Cl2 monolayers to craft two-dimensional (2D) Janus (Cl2)-(Bi12O17)-(MoS2) bilayer junctions, a new 2D motif different from van der Waals heterostructure. Electrons and holes from visible light-irradiated Bi12O17Cl2 are directionally separated by the internal electric field to (Bi12O17) and (Cl2) end-faces, respectively. The separated electrons can further migrate to MoS2 via Bi–S bonds formed between (Bi12O17) and MoS2 monolayers. This atomic-level directional charge separation endows the Janus bilayers with ultralong carrier lifetime of 3,446 ns and hence a superior visible-light PHE rate of 33 mmol h−1 g−1. Our delineated Janus bilayer junctions on the basis of the oriented assembly of monolayers presents a new design concept to effectively steer the charge flow for PHE.

Influence of Steric Hindrance of N‐Heterocyclic Ancillary Ligands on the Structure and Magnetic Properties of Manganese(II) Coordination Polymers

AbstractThree biphenyl‐3,5‐dicarboxylic acid (H2L) based coordination polymers, namely, [Mn3(L)3(2,2′‐bpy)2]n (1), {[Mn(L)(phen)]·(MeOH)}n (2), and [Mn(L)(dipt)]n (3), (2,2′‐bpy = 2,2′‐bipyridine, phen = 1,10‐phenanthroline, and dipt = 2,9‐dimethyl‐1,10‐phenanthroline) were synthesized and characterized by single‐crystal X‐ray diffraction and analyses of their magnetic properties. 1 is a trinuclear manganese structure with a 2D motifs, which can join by hydrogen bond bridges to give 3D supramolecular architectures. 2 has a dinuclear center forming a 1D supramolecular ladder chain. The mononuclear complex 3 displays 1D metal‐organic chains driven by μ2‐L linkers. Their structural differences were investigated, revealing that the influence of steric hindrance on the structures of acid‐based coordination polymers is realized through changing the N‐heterocyclic ancillaries of diverse steric hindrance. Obviously, with decreasing of the steric hindrance of the N‐donor ligand, complexes 1–3 show structures from 1D to 2D and mononuclear to multinuclear. Magnetic susceptibility measurements indicate that 1 and 2 have dominating antiferromagnetic couplings between metal ions, whereas compound 3 is paramagnetic.

Photoluminescence properties of three d10 complexes constructed from the bifunctional benzimidazole-carboxylate-based connector

To study the photoluminescence properties, three 2D complexes {Ag2(Hmbbc)2(ClO4)2(H2O)}n (1), {Ag(mbbc)}n (2) and {Cd(mbbc)2}n (3) based on d10 metal centres and flexible ligand 4′-[4-methyl-6-(1-methyl-1H-benzimidazoly-l-2-group)-2-n-propyl-1H-benzimidazolylmethyl]-biphenyl-2-carboxylic acid (Hmbbc) have been synthesized under solvothermal conditions. Complex 1 possesses a 2D layer architecture, which comprises two crystallographically 2D motifs, whereas complex 2 features a binuclear-based 2D network with Ag⋯Ag distance of 7.667Å. In complex 3, the Hmbbc acts as a bisdentate connector bridging Cd(N2O4) to form a 2D framework. In contrast to mbbcNa, the phosphorescence emission of complexes 1 and 2 has been enhanced, indicating metal center and structure-dependent photoluminescence.

1,2,4-Triazolyl-Carboxylate-Based MOFs Incorporating Triangular Cu(II)-Hydroxo Clusters: Topological Metamorphosis and Magnetism

Bifunctional 1,2,4-triazole-carboxylate ligands, an achiral 1,2,4-triazol-4-yl-acetic acid (trgly-H) and a chiral (d)-2-(1,2,4-triazol-4-yl)-propionic acid (d-trala-H), derived from the corresponding α-amino acid precursors revealed unique binding abilities in the construction of Cu(II)-coordination polymers composing discrete triangular [Cu3(μ3-OH)] clusters. A related series of MOFs, [Cu3(μ3-OH)(trgly)3(SO4)]·2H2O (1a), [Cu3(μ3-OH)(trgly)3(H2O)3]SO4·16H2O (1b), Cu3(μ3-OH)(d-trala)3(ClO4)0.5](ClO4)1.5·1.5H2O (2), was prepared, and their crystal structures were determined by means of X-ray diffraction. Being singly deprotonated, the organic ligands act as multidentate μ3- or μ4-donors using tr and -COO(-) moieties. The generated [Cu3(μ3-OH)(tr)3] cluster core is primarily supported by three [-N-N-] triazole heterocycles in a basal plane and tripodal-assisted μ3-anions (SO4(2-): 1a; ClO4(-): 2) capping the axial faces. The carboxylate groups join the units into either two-dimensional (2D) layer (1a, 2) or 3D zeolite-like networks (1b). Compound 1b represents the topology of α-Po (pcu: 4(12).6(3)) and crystallizes in the noncentrosymmetric space group I4̅3m, in which the six-connected [Cu3(μ3-OH)] clusters and trgly self-assemble in an open-channel cubic array possessing ∼56% solvent-accessible volume. Upon slight thermal treatment (∼60 °C), the structure irreversibly shrinks to the nonporous 2D motif 1a that belongs to a uninodal (3,6) network type. In structure 2 (space group R32), due to the [-N-N-] triazole and 1,3-bidentate carboxylate binding mode, each organic ligand bridges three metal clusters affording cross-linking of two adjacent layers with the same (3,6) topology. The resultant 3,9-c net is novel and can be categorized as two-nodal with point symbol {4(18).6(18)}{4(2).6}3. Spin frustration and antisymmetric exchange effects, resulting in abnormally low g values in the S = 1/2 states, were observed in the magnetic properties and the EPR spectra.

An unusual polythreaded coordination network self-assembled from 2D motifs with two distinct lateral arms

Self-assembly of the trigonal 1,3,5-benzenetricarboxylate (H3btc) and copper salt in the presence of large trigonal N-containing ligand yields a fascinating entangled network, [Cu(Hbtc)(Htpba)]·1.5H2O (1) (Htpba=4-([4,2′:6′,4″-terpyridin]-4′-yl) benzoic acid). Compound 1 exhibits a novel (2D→3D) polythreaded network that is first assembled from 2D layers with two types of lateral arms. By inspection of the structure of 1, it is believed that the trigonal ligands with uncoordinated groups acting as dangling lateral arms play an important role in the formation of polythreaded network. The magnetic properties of compound 1 have been studied in the temperature range 2–300K.