3D Coordination Framework Research Articles

Mn(II) 3D Coordination Framework with Mixed 5-Aminoisophthalato and Pyridyl-isonicotinoyl Hydrazone Bridges: Structure, Electrical Conductivity, Anticancer Activity, and Drug Delivery

Mn(II) 3D Coordination Framework with Mixed 5-Aminoisophthalato and Pyridyl-isonicotinoyl Hydrazone Bridges: Structure, Electrical Conductivity, Anticancer Activity, and Drug Delivery

2D and 3D Ag(I) coordination polymers with a 2-methylimidazole substituted cyclotriphosphazene ligand: Structures and dye adsorption properties

Coordination polymers are a promising crystalline framework for dye capture and separation in recent years. We are reporting herein the two new, Ag(I) coordination polymers, namely {[Ag3(MeIm-Cp)2](NO3)3}n (1) and {[Ag(MeIm-Cp)](CH3PhSO3)} (2), were synthesized from hexapodal-shaped 2-methylimidazole substituted cyclotriphosphazene, (MeIm-Cp). MeIm-Cp was characterised by 1H NMR, 31P NMR and mass analysis. Structure of each isolated compounds were assigned by single crystal X-ray crystallography. In complex 1, MeIm-Cp has a κ6N coordination mode by connecting six Ag(I) ions to constitute a 3D coordination framework whereas the ligand in complex 2 displays κ4N coordination mode via linking four Ag(I) ions together to create a 2D coordination polymer. Topologically, coordination polymer 1 exhibits a 4,4,6-connected three nodal net with point symbol {44.62}3{46.68.8}2, while coordination polymer 2 displays a four-connected network having the point symbol {43.63}. According to thermogravimetric analysis, the thermal stability of MeIm-Cp is higher than complexes. The synthesized coordination polymers were used for the adsorption of some cationic and anionic organic dyes in aqueous media, Dye adsorption studies were performed out using UV–Vis. absorption spectroscopy. Adsorption experiments show that complex 1 removes the anionic methyl orange (MO) and tartrazine (E102) from water but shows no adsorption behaviour toward the cationic methylene blue (MB).

Influence of solvent coordination on crystal structure and luminescent property in lanthanide MOFs

Two isomorphous Ln-MOFs with pyridine-2, 4, 6-tricarboxylic acid (H3PTC), Eu-PTC-DMF and Tb-PTC-DMF, were prepared by solvothermal synthesis method and characterized by IR spectroscopy, and thermogravimetric analysis, and powder X-ray diffraction techniques. Single-crystal structural analyses indicate that the Ln1 and Ln2 coordination polyhedra are connected by sharing corners of polyhedra to construct 1D chain, which further form a 3D coordination framework through the connection of PTC3- ligands, and the solvent molecules of DMF and H2O, as the terminal ligands, are bound to polyhedra of Ln3+ ions. Investigation of the photophysical property at ambient conditions revealed that both Ln-MOFs emit characteristic luminescence of Ln3+ ions. Eu-PTC-DMF and Tb-PTC-DMF possess microsecond scale emission lifetime with absolute quantum yields as high as 33.1% and 50.8%, respectively.

Lanthanide Hexacyanidoruthenate Frameworks for Multicolor to White-Light Emission Realized by the Combination of d-d, d-f, and f-f Electronic Transitions.

We report an effective strategy toward tunable room-temperature multicolor to white-light emission realized by mixing three different lanthanide ions (Sm3+, Tb3+, and Ce3+) in three-dimensional (3D) coordination frameworks based on hexacyanidoruthenate(II) metalloligands. Mono-lanthanide compounds, K{LnIII(H2O)n[RuII(CN)6]}·mH2O (1, Ln = La, n = 3, m = 1.2; 2, Ln = Ce, n = 3, m = 1.3; 3, Ln = Sm, n = 2, m = 2.4; 4, Ln = Tb, n = 2, m = 2.4) are 3D cyanido-bridged networks based on the Ln-NC-Ru linkages, with cavities occupied by K+ ions and water molecules. They crystallize differently for larger (1, 2) and smaller (3, 4) lanthanides, in the hexagonal P63/m or the orthorhombic Cmcm space groups, respectively. All exhibit luminescence under the UV excitation, including weak blue emission in 1 due to the d-d 3T1g → 1A1g electronic transition of RuII, as well as much stronger blue emission in 2 related to the d-f 2D3/2 → 2F5/2,7/2 transitions of CeIII, red emission in 3 due to the f-f 4G5/2 → 6H5/2,7/2,9/2,11/2 transitions of SmIII, and green emission in 4 related to the f-f 5D4 → 7F6,5,4,3 transitions of TbIII. The lanthanide emissions, especially those of SmIII, take advantage of the RuII-to-LnIII energy transfer. The CeIII and TbIII emissions are also supported by the excitation of the d-f electronic states. Exploring emission features of the LnIII-RuII networks, two series of heterobi-lanthanide systems, K{SmxCe1-x(H2O)n[Ru(CN)6]}·mH2O (x = 0.47, 0.88, 0.88, 0.99, 0.998; 5-9) and K{TbxCe1-x(H2O)n[Ru(CN)6]}·mH2O (x = 0.56, 0.65, 0.93, 0.99, 0.997; 10-14) were prepared. They exhibit the composition- and excitation-dependent tuning of emission from blue to red and blue to green, respectively. Finally, the heterotri-lanthanide system of the K{Sm0.4Tb0.599Ce0.001(H2O)2[Ru(CN)6]}·2.5H2O (15) composition shows the rich emission spectrum consisting of the peaks related to CeIII, TbIII, and SmIII centers, which gives the emission color tuning from blue to orange and white-light emission of the CIE 1931 xy parameters of 0.325, 0.333.

Tunable Intervalence Charge Transfer in Ruthenium Prussian Blue Analog Enables Stable and Efficient Biocompatible Artificial Synapses.

Emerging concepts for neuromorphic computing, bioelectronics, and brain-computer interfacing inspire new research avenues aimed at understanding the relationship between oxidation state and conductivity in unexplored materials. This report expands the materials playground for neuromorphic devices to include a mixed valence inorganic 3D coordination framework, a ruthenium Prussian blue analog (RuPBA), for flexible and biocompatible artificial synapses that reversibly switch conductance by more than four orders of magnitude based on electrochemically tunable oxidation state. The electrochemically tunable degree of mixed valency and electronic coupling between N-coordinated Ru sites controls the carrier concentration and mobility, as supported by density functional theory computations and application of electron transfer theory to in situ spectroscopy of intervalence charge transfer. Retention of programmed states is improved by nearly two orders of magnitude compared to extensively studied organic polymers, thus reducing the frequency, complexity, and energy costs associated with error correction schemes. This report demonstrates dopamine-mediated plasticity of RuPBA synapses and biocompatibility of RuPBA with neuronal cells, evoking prospective application for brain-computer interfacing.

A Multifunctional Fluorescence Europium‐Organic Framework for Turn‐On Sensing of pH and Turn‐Off Sensing of 2‐Thiazolidinethione‐4‐carboxylic Acid and Aztreonam

Comprehensive SummaryA luminescent lanthanide‐organic framework [Eu2(adip)(H2adip)(DMF)2]·CH3OH (1) was synthesized by a solvothermal method using anthracene‐based ligand 5,5’‐(anthracene‐9,10‐diyl)diisophthalic acid (H4adip). 1 possesses a 3D coordination framework, which could be rationalized as a 4,8‐connected 2‐nodal (416612)(4462) topological network. 1 shows an excellent linear increase in fluorescence intensity as the pH value rises from 4.8 to 7.1. Particularly, the fluorescence enhancement percentage reaches 588% for each increase of pH value, which is the highest value recorded for fluorescence pH sensing materials, promoting the sensitivity of pH detection within the physiological pH range. In addition, 1 can also specifically recognize carbon disulfide biomarkers 2‐thiothiazolidine‐4‐carboxylic acid (TTCA) and antibiotic aztreonam (ATM) by fluorescence quenching, with the KSV values of 1.02 × 105 L·mol–1 (0—10 μmol·L–1) and 4.67 × 105 L·mol–1 (0—50 μmol·L–1), the limit of detection (LOD) of 86 nmol·L–1 and 19 nmol·L–1, respectively. Among only a few cases reported, the detection sensitivities of 1 for both TTCA and ATM are the highest. The sensing mechanisms of pH, TTCA, and ATM are also discussed in detail.

3D Ag(I) coordination polymer constructed from a flexible pyridyloxycyclotetraphoshazene linker: Synthesis, crystal structure and dye adsorption properties

The reaction of the flexible polydentate ligand octakis(3-pyridyloxy)cyclotetraphosphazene (O3PyCP) with AgNO3 afforded a new coordination polymer, [Ag2(O3PyCP)](NO3)2]n (1). The resultant coordination polymer was characterized by single-crystal X-ray crystallography and infrared spectroscopy. The ligand O3PyCP acts in the κ6N coordination mode by connecting six Ag(I) ions to form a 3D coordination framework. Topological analysis confirms that compound 1 shows a 3D structure with a fsc topology with the vertex symbol of {44.610.8}{44.62}. The thermal stability of O3PyCP and compound 1 were investigated by thermogravimetric analysis. The study of dye adsorption by tetracyclophosphazene-based coordination polymers was carried out for the first time in this study. According to dye adsorption studies, compound 1 adsorbs anionic methyl orange (MO) from water, but does not exhibit any adsorption behaviour toward cationic methylene blue (MB). A pseudo-second-order kinetic model is suitable to explain the adsorption kinetics.

Unique Ligand Exchange Dynamics of Metal–Organic Polyhedra for Vitrimer-like Gas Separation Membranes

Unique Ligand Exchange Dynamics of Metal–Organic Polyhedra for Vitrimer-like Gas Separation Membranes

Zn-diarylethene organic framework for anticounterfeiting: Crystal structure, photochromism and fluorescence switch

A new photochromic metal-organic framework [Zn(BCM)2(bpfb)] where H2BCM ​= ​1,2-bis(5-carboxylic acid-2-methylthien-3-yl)hexafluorocyclopentene, bpfb ​= ​N,N-bis-(4-pyridylformamide)-1,4-benzenediamine, was synthesized and characterized by Single Crystal X-ray Diffraction, Powder X-ray Diffraction, Elemental Analysis, Fourier Transform Infrared Spectroscopy (FT-IR) and Thermogravimetric Analysis (TGA). [Zn(BCM)2(bpfb)] crystallizes in a monoclinic P21/n space group. The Single crystal X-ray structure determination revealed a three dimensional (3D) coordination framework of dinuclear zinc clusters [Zn2(COO)4N2] interconnected both BCM2− and bpfb. And [Zn(BCM)2(bpfb)] exhibited reversible photochromism behavior derived from diarylethene BCM2− ligand. Besides, [Zn(BCM)2(bpfb)] can be further used to photo-switch the luminescence emission, which can achieve precisely reading out and concealing information in reversible transformation.

Structural Diversity of Silver Fluorinated β-Diketonates: Effect of the Terminal Substituent and Solvent.

In order to demonstrate the role of the fluorination and some solvents in the structural organization of the Ag(I) coordination polymers with β-diketonate ligands (R1C(O)CαHC(O)R2)− we synthesized a series of the compounds containing tfac- (R1 = CH3, R2 = CF3) and pfpac- (R1 = CH3, R2 = C2F5) anions. Solvent-free [Ag(L)]∞ (L = tfac 1, pfpac 2) compounds and the corresponding acetonitrile and toluene adducts have been characterized by elemental analysis and/or NMR, IR and single-crystal XRD. This series includes five new coordination polymers. Compound 1 is a 3D coordination framework based on Ag–Ochelate/bridge, Ag–Cα bonds, and argentophilic interactions. An increase in the fluorinated group leads to a chain coordination polymer 2 of an unusual structural organization. These chains can be represented as a “DNA-type”, where two intertwined helices based on Ag–Ochelate and Ag–Cα bonds are connected through Ag–Obridge ones. Two structural types of chain coordination polymers, [Ag(tfac)(CH3CN)] and [Ag2(L)2(solvent)], have been revealed for the adducts. The latter structural type differs significantly from the previously studied toluene and acetonitrile adducts of fluorinated Ag(I) β-diketonates of the same stoichiometry. Thermal analysis in helium showed that both 1 and 2 decompose to metallic silver with the compound of pfpac-ligand being slightly more stable.

Four new cobalt(II)/zinc(II) complexes derived from the naphthalene-bridging bis(pyridyl)-bis(amide) ligand: Fluorescence sensing Fe3+ ions and CrO42− anions, photocatalytic degrading dyes

Four cobalt(II)/zinc(II) metal-organic coordination complexes [Co(Hbtc)(L)]∙H2O (1), [Co2(bpt)(OH)(L)]∙3H2O (2), [Zn3(btc)2(L)2(H2O)4]·2H2O (3), and [Zn2(bpt)(OH)(L)]∙2H2O (4) have been synthesized from hydrothermal reaction of cobalt (or zinc) nitrate with the mixed ligands of the naphthalene-bridging amide L (N′,N″-di(pyridin-3-yl)naphthalene-2,6-dicarboxamide) and two kinds of tricarboxylic acids (H3btc ​= ​1,3,5-benzenetricarboxylic acid, H3bpt ​= ​biphenyl-3,5,4′-tricarboxylic acid). Complex 1 shows an interesting 3D coordination framework with 3,5-connected {42.65.83}{42.6} topology, which represents a 2-fold interpenetrating 3D net constructed by 1D [Co(Hbtc)]n ribbon chains and 1D [Co(L)]n wave chains. Complexes 2 and 4 exhibit similar unique 3D networks based on the 2D [M2(bpt)(OH)(L)]n (M ​= ​Co for 2, Zn for 4) layers and μ2-bridging L ligands, showing the 3,10-connected {410.632.83}{43}2 topology. Complex 3 displays a 2D layered coordination framework with the 3,4-connected {6.82}2{64.82}2{8} topology, representing an interesting three-fold interpenetrating feature. The diverse framework structures of four cobalt(II)/zinc(II) complexes reveal the influences of different metal ions and tricarboxylic acids on the construction of these coordination frameworks. The fluorescent emission behaviors of 1–4 and the fluorescent sensing efficiencies of 3–4 have been studied. Complexes 3–4 display remarkable fluorescence quenching phenomenons towards Fe3+ ions and CrO42− anions. Moreover, the photocatalytic activities of 1–4 towards degrading dye molecules have also been investigated.

Catalytic C-H Bond Activation and Knoevenagel Condensation Using Pyridine-2,3-Dicarboxylate-Based Metal-Organic Frameworks.

Three 1D coordination polymers (CPs) [M(pdca)(H2O)2]n (M = Zn, Cd, and Co; 1–3), and a 3D coordination framework {[(CH3)2NH2][CuK(2,3-pdca)(pa)(NO3)2]}n (4) (2,3-pdca = pyridine-2,3-dicarboxylate and pa = picolinic acid), have been synthesized adopting a solvothermal reaction strategy. The CPs have been thoroughly characterized using various spectral techniques, that is, elemental analyses, FT-IR, TGA, DSC, UV/vis, and luminescence. Structural information on 1–4 was obtained by PXRD and X-ray single-crystal analyses, whereas morphological insights were attained through FESEM, AFM, EDX, HRTEM, and BET surface area analyses. Roughness parameters were calculated from AFM analysis, whereas dimensions of small domains and interplanar spacing were defined with the aid of HRTEM. CPs 1–3 are 1D isostructural networks, whereas 4 is a 3D framework. Moreover, 1–4 display moderate luminescence at rt. In addition, 1–4 have been applied as economic and efficient porous catalysts for the Knoevenagel condensation reaction and C–H bond activation under mild conditions with good yields (95–98 and 97–99%), respectively. Notably, 1–3 can be reused up to seven cycles, whereas 4 can be reused up to five catalytic cycles with retained catalytic efficiency. Relative catalytic efficacy toward the Knoevenagel condensation reaction follows in the order 2 > 1 > 3 > 4, whereas 2 > 4 > 1 > 3 for C–H activation. The present result demonstrates synthetic, structural, optical, morphological, and catalytic aspects of 1–4.

Hydrothermal synthesis, structure and properties of a new 3D two-fold Co-based coordination framework

A new 3D coordination polymer, [Co2(MIP)2(BMIP)] n (1), [H2MIP = 5-methyl-isophthalic acid, BMIP = 1,5-bis-(2-methyl-imidazol)pentane] has been synthesized and characterized by single crystal X-ray diffraction analysis. The results of structural analyses show that 1 has a two-fold interpenetrated 3D network with a pcu topology. In addition, the luminescent, electrochemical properties and degradation of MB and MO of the complex were studied. The photocatalytic mechanism was proposed and confirmed by trapping experiments of radical species.

A Three‐Dimensional Pentanuclear Co(II) Coordination Polymer: Structural Topology, Hirshfeld Surface Analysis and Magnetic Properties

AbstractA 3D pentanuclear coordination polymer of Co(II); {[Co5(L2‐)4(HL‐)2(bpmp)2 (H2O)2].(H2O)5}n (CP1) was synthesized by the self‐assembly of semi‐flexible 5‐benzylamino‐isophthalic acid (H2L) and N‐donor auxiliary ligand 1,4‐bis(4‐pyridinylmethyl)piperazine (bpmp) using Co(NO3)2 ⋅ 6H2O under hydrothermal condition. The CP1 has been structurally characterized by elemental analysis, TGA, Powder‐XRD and IR spectroscopy which was further corroborated by single crystal X‐ray studies. Structurally, it is a 3D pentanuclear cobalt cluster secondary building units (SBUs) which are formed by carboxylates oxygen of H2L and nitrogen of bpmp. The topological analysis revealed that CP1 possesses a 2‐nodal 5,6‐connected three‐dimensional (3D) coordination framework with pcu net. Variable temperature magnetic measurements demonstrate that CP1 shows antiferromagnetic behavior.

Three Functionalized Zinc(II)/Cobalt(II) Coordination Complexes Demonstrating Fluorescent Sensing Activities towards Fe3+ Ions and Photocatalytic Selectivity for Organic Dyes

Three new zinc(II)/cobalt(II) coordination complexes [Zn(HBTB)(L)0.5] (1), [Zn(HCPPA)(L)] (2), and [Co(HCPPA)(L)]·2H2O (3) [H3BTB = 1,3,5‐tri(4‐carboxylphenyl)benzene, H3CPPA = 5‐(4‐carboxyl‐phenoxy)‐isophthalic acid, L = N1,N4‐bis(3‐pyridyl)naphthaldiamide] were solvothermally synthesized. The structural characterization reveals that complex 1 represents a 3D coordination framework with a binodal 3,4‐connected {4.102}2{4.105}2 topology constructed from the 2D [Zn(HBTB)]n polymeric double‐layers and the bidentate L ligands. Complex 2 is a 1D metal‐organic chain derived from the dinuclear [Zn2(HCPPA)2] loops and [Zn2(L)2] loops. Complex 3 possesses a binodal 3,5‐connected {42.6}{43.6.84.102} topological 2D layered architecture based on the [Co2(HCPPA)2] ribbon chains and the bidentate L ligands. For 2 and 3, their adjacent chains or layers are respectively stacked into 3D supramolecular architectures via the hydrogen bonds. Moreover, the fluorescent and fluorescent sensing activities towards small solvent molecules of coordination complexes 1 and 2, the photocatalyitc properties of 1–3 towards organic dyes were studied.

Construction of a series of Zn(II) and Cd(II) coordination polymers bearing 1,3-bis(benzimidazol-1-yl)-2-propanol ligands: Syntheses, crystal structures, and sensing properties

Five coordination polymers (CPs), namely {[Zn(L)(ip)·H2O]8}n (1), {[Zn(L)(2-ntp)]·H2O}n (2), {[Zn(L)(tdc)·2H2O]2}n (3), {[Cd(L)(tp)·H2O]·3.43H2O}n (4) and [Cd(L)(5-mip)]n (5) (L ​= ​1,3-bis(benzimidazol-1-yl)-2-propanol, H2ip ​= ​isophthalic acid, 2-H2ntp ​= ​2-nitroterephthalic acid, H2tdc ​= ​2,5-thiophenedicarboxylic acid, H2tp ​= ​terephthalic acid and 5-H2mip ​= ​5-methylisophthalic acid) have been hydrothermally synthesized. 1 exhibits a 3D 4-connected coordination framework with the rarely (86)-hxg/p topology. 2 is 2D (6,3) network incorporating [Zn2(L)2] loops, and further extended into a 3D supramolecular framework by O–H⋯O hydrogen bondings. 3 possesses a three-fold interpenetrated diamond network. 4 also forms a 2D (6, 3) layer, which is extended to a 3D supramolecular framework by the aromatic stacking interactions. 5 displays a 3,5-connected 3D 3,5T1 framework with a point symbol of {42·65·83}{42·6}. Further, 1 and 2 exhibit highly selectivity and sensitivity for luminescence sensing of acetone/Cr2O72− anions in aqueous solution, respectively.

A 3D Cu(ii) tetrazolate coordination polymer based on pentanuclear units with a large coercive field.

A novel 3D coordination polymer {[Cu4.5 (BTZE)1.5 (μ3-OH)3(μ-OH)(SO4)(H2O)1.5·4H2O]}n (1) was synthesized by a solvothermal reaction of 1,2-bis(tetrazol-5-yl) ethane (BTZE) with copper sulfate. Compound (1) contained triangular [Cu3(μ3-OH)] cluster based magnetic Δ-chains linked with in situ generated μ2-BTZE ligands to form a 2D cyclic annular layer. This 2D layer structure was further modified with sulfate and symmetry-related μ3-OH groups, extending to a 3D coordination framework structure. The magnetic performance of (1) was characterized in the temperature range of 2-300 K in terms of direct-current and alternating-current magnetic susceptibilities, revealing that (1) was a canted ferromagnet with a critical temperature (Tc) of 9.5 K. Notably, (1) behaved as a hard magnet with a coercive field of 2.3 kOe at 2 K, showing significant unique characteristics compared to those of the reported spin canting systems based on pure Cu(ii) ions.

Cluster-based CaII, MgII and CdII coordination polymers based on amino-functionalized tri-phenyl tetra-carboxylate: Bi-functional photo-luminescent sensing for Fe3+ and antibiotics

Excess and deficiency of iron(III) and antibiotics from normal permissible limits will induce serious disorders, so their detection is important but challenging. In this work, the asymmetric amino-functionalized tetra-carboxylate H4L (2′-amino-1,1’:4′,1″-terphenyl-3,3″,5,5″-tetracarboxylic acid) containing large conjugated ter-phenyl aromatic backbones have been synthesized and employed. Through a one-pot powerful solvo-thermal synthetic strategy, a series of unique tri-nuclear cluster-based CaII, MgII and CdII coordination polymers, namely [Ca1.5(μ8-HL)(DMF)]n (1), {[Mg1.5(μ7-HL)·(H2O)2]·3H2O}n (2) and {[Cd1.5(μ10-L)0.75]n·H2O·DMF}n (3) have been successfully prepared. 1–3 exhibit excellent photo-luminescent properties and good fluorescence stability. Structural analyses reveal that tri-nuclear CaII secondary building blocks (SBUS) are linked via HL3−, forming the 2D clustered-based micro-porous coordination polymer 1. As for 2, three carboxylate groups of partly de-pronated HL3− also link these neighboring tri-nuclear MgII SBUS, which constructs the 2D MgII coordination framework 2. As for 3, fully de-pronated L4− also links these neighboring tri-nuclear CdII SBUS, which ultimately constructs the 3D micro-porous coordination framework 3. Experimental powder x-ray diffraction (PXRD) patterns coincide well with the theoretical patterns, which indicate that we have successfully synthesized the pure phase material 1–3. Photo-luminescent experiments demonstrate that coordination polymers 1–3 can be successfully applied towards bi-functional sensing for sensitive detection of Fe3+ and the antibiotics NZF (Nitrofurazone). To the best of our knowledge, this is the first example of the application of amino-functionalized tri-phenyl tetra-carboxylate based MOFs towards bi-functional discrimination of Fe3+ and NZF antibiotics with high efficiency Ksv values (For Fe3+: 7.28 × 104 M−1 for 1; 3.38 × 104 M−1 for 2 and 3.29 × 104 M−1 for 3 and for NZF antibiotics: 4.47 × 103 M−1 for 1; 4 × 103 M−1 for 2 and 5.6 × 103 M−1 for 3).

Ultra-highly selective trapping of perrhenate/pertechnetate by a flexible cationic coordination framework.

The selective binding and trapping of perrhenate/pertechnetate is of great interest in the contamination remediation of nuclear waste. Herein, we report a cationic metal-organic framework (TJNU-216, TJNU = Tianjin Normal University), with ultra-high selectivity in trapping perrhenate/pertechnetate in the presence of a large excess of SO42- (20 000 times) or NO3- (300 times), and the highest exchange capacity of 417 mg g-1 (1 mol mol-1). The exchange mechanism can be confirmed by the crystal structure of TJNU-216(Re) via single-crystal-to-single-crystal transformation.

Syntheses, Structures, and Luminescent Properties of Two Alkaline Earth Metal Coordination Polymers from Hydroxymethyl Imidazole Dicarboxylate

Two new alkaline earth metal coordination polymers, which are [Ba(H2IDC)-(H3HmIDC)(H2O)2]n (I) and [Sr(H2HmIDC)]n (II) [H3IDC = 1H-imidazole-4,5-dicarboxylic acid, H4HmIDC = 2-(hydroxymethyl)-1H-imidazole-4,5-dicarboxylic acid), respectively, have been successfully synthesized under solvothermal conditions by employing H4HmIDC as the starting material. Both compounds I and II were structurally characterized by diverse techniques, such as single crystal X-ray diffraction (CIF files CCDC nos. 1839705 (I) and 1839706 (II)), FT-IR spectra, powder X-ray diffraction, and thermogravimetric analyses. Compound I exhibits a two-dimentional (2D) coordination network with a (4, 4) topology based on dinuclear [Ba2O4] as second building units (SBUs). Whereas compound II features a 3D coordination framework based on infinite 1D inorganic chains as SBUs, which can be further simplified as a 5‑connected noy topology. In addition, the photoluminescent properties of both compounds I and II were also investigated.