Tetracarboxylic Acid Research Articles

The effect of central metal in phthalocyanine for photocatalytic hydrogen evolution via artificial photosynthesis

Abstract Phthalocyanines (Pcs) are promising sensitizers in photocatalytic hydrogen evolution reaction from water splitting owing to the unique absorption properties and familiar sensitizers for light phase of photosynthesis. In this paper, two phthalocyanines (Pcs) bearing tetra carboxylic acid at the peripheral position with Zn and Co atoms as a central metal have been prepared in order to investigate the effect of the central metal atoms on the performance of photocatalytic hydrogen evolution from water splitting for mimicking photosynthesis. The photoelectrochemical and photocatalytic hydrogen evolution experiments have been carried out by using Pcs sensitized TiO2 (TiO2, ZnPc/TiO2 and CoPc/TiO2) and Pt co-catalyst in the presence of triethanolamine (TEOA) as a sacrificial electron donor under visible light. The hydrogen production rate of ZnPc/TiO2 and CoPc/TiO2 have been determined as the 1146 and 1051 μmolg−1h−1, respectively. The hydrogen evolution rates of ZnPc/TiO2 and CoPc/TiO2 have been enhanced by in situ photodeposited Pt, which are reached by 3448 and 3328 μmolg−1h−1 for the ZnPc/TiO2/Pt and CoPc/TiO2/Pt, respectively. These results have been established that ZnPc sensitized TiO2 shows more photocatalytic activity than CoPc sensitized TiO2 in the both absence and presence of Pt. These obtained results can be attributed to the spectral response of Pc sensitizers.

Electrospun antibacterial poly(vinyl alcohol)/Ag nanoparticles membrane grafted with 3,3′,4,4′-benzophenone tetracarboxylic acid for efficient air filtration

In this study, poly(vinyl alcohol) (PVA) membranes containing Ag nanoparticles (AgNPs) were prepared by electrospinning and grafted copolymerization with 3,3′,4,4′-benzophenone tetracarboxylic acid (BPTA) to provide better mechanical properties, lower water vapor transmittance, and higher antibacterial activity (against Staphylococcus aureus and Escherichia coli) than the PVA/AgNPs membrane. The PVA/AgNPs/BPTA membrane showed higher antibacterial activity than the other membranes, and it produced inhibition zones with diameters of 18.12 ± 0.08 and 16.41 ± 0.05 mm against S. aureus and E. coli, respectively. The PVA/AgNPs/BPTA membrane was found to be capable of promoting reactive oxygen species (ROS) formation under both light and dark conditions. Cycling experiments performed following ROS quenching showed that the best-performing composite membrane retained >70% of its original OH⋅ radical and H2O2 charging capacity after seven cycles. In the filtration test, the electrospun nanofibrous membranes showed high filtration efficiencies of 99.98% for sodium chloride (NaCl). In addition, these membranes maintained a relatively low pressure drop of 168 Pa with a basis weight of 2.1 g m−2. Thus, the PVA/AgNPs/BPTA membrane was concluded to be a promising medical protective material offering the benefits of structural stability and reusability.

A Fluorescent Zn(II) Coordination Polymer: Sensitive Detection of Cr2O72- in Water and Prevention Activity On the Deep Vein Thrombosis in Orthopedic Nursing.

A novel coordination polymer (CP) based on Zn(II) of [Zn(tptc)0.5(bpy)(H2O)]n (1) was synthesized through utilizing the 2,2'-bipyridine (bpy) chelating N donors and p-terphenyl-2,2'',5'',5'''-tetracarboxylate acid (H4tptc) as the co-ligands. The measurements of the fluorescence were implemented for the complex 1 in solution and solid state, and the result reveals that 1 has a strong fluorescence and it is a sensory material with great development space to determine the trace Cr2O72- (with the detection limit of 36ppb) in the water solutions via applying the fluorescence quenching effect. As the common disease in the orthopedic nursing, the deep vein thrombosis was the objective in this research. The weigh and length of the thrombus in the animals were measured and analyzed. In addition to this, the inflammatory response in the deep vein thrombosis animal was evaluated by RT-PCR. Molecular docking results indicate that only the carboxyl group could provide polar oxygen atoms for the formed hydrogen bonds to the protein.

Two Co(II) coordination polymers: treatment activity on myocardial injury during sepsis via reducing ROS accumulation in the cardiomyocytes

Two coordination polymers on the basis of distinct nitrogen-donor ligands and biphenyl-2,2′,5,5′-tetracarboxylic acid H4(o,m-bpta), {[Co2(o,m-bpta)(1,3-bimb)2]·DMF·2H2O}n (1) {1,3-bimb = [1,3-phenylenebis(methylene)]bis(1H-imidazole)} and {[Co2(o,m-bpta)(1,4-bimb)2]·H2O}n (2) {1,4-bimb = [1,4-phenylenebis(methylene)]bis(1H-imidazole)} were prepared under solvothermal conditions. These two complexes were then characterized through single-crystal X-ray diffraction, elemental analysis, IR spectroscopy and thermogravimetric (TG) analysis as well as the analysis of powder X-ray diffraction (PXRD). Compounds 1 and 2 were then studied to develop new candidates for the sepsis treatment and myocardial injury prevention. The reactive oxygen species (ROS) accumulation in the cardiomyocytes was detected with indicated kit and the enzyme linked immunosorbent assay (ELISA) test kit was conducted for the inflammatory cytokines evaluation.

Tri-functional oligomeric polyesters prepared from new dicarboxylic acids containing several amino acids residues by Higashi methodology: synthesis, characterization, and study of solubility and thermal behavior

The synthesis of polyfunctional aliphatic oligomeric polyesters (poly(ether-imido-esters; PEIEs) containing several amino acid residues is described, and their thermal properties and solubility behavior were studied. The new symmetrical monomeric dicarboxylic acids were synthesized using 4-nitrophthalonitrile as starting material, which reacted with bisphenol-A or bis(4-hydroxyphenyl)diphenylmethane. Then, the tetranitrile derivatives were hydrolyzed to the tetracarboxylic acids and dehydrated to the respective dianhydrides. Finally, these compounds reacted with the amino acids glycine or L-alanine to obtain the aliphatic dicarboxylic acid monomers. PEIEs were obtained by Higashi methodology from these monomers and bisphenol-A, characterized by elemental analysis, NMR and IR, and the results were in agreement with the structures. The materials were soluble at 25 °C in several aprotic polar organic solvents and some in CHCl3 and THF. In agreement with the viscosity and SEC results, PEIEs were oligomers with degree of polymerization of four and six, and Mw and Mn between 7370–9790 g/mol and 3680–4850 g/mol, respectively. The samples showed low Tg values (124–160 °C), associated with important structural flexibility promotes by dicarboxylic acid monomers. Despite this, this parameter depended of the aminoacidic residue nature in the sense that when the volume of it increased, the Tg also increased due to a decrease in the free rotation that negatively affects the segmental movements of the chains. This effect was also observed when the side groups of the diphenol moiety of the dicarboxylic acid monomers increase from methyl to phenyl. The recorded TDT10% values from the TGA analysis (334–457 °C) do not allow to consider these samples as thermoset materials. In this sense, it was possible to observe an average increase of 8–13 °C and 23–28 °C when the lateral group volume of the amino acid residues and of the diphenol moiety are increased, respectively.

Synthesis of Spiro1,4-Dihydropyridines: A Review.

The preparation of medicinally promising spiro1,4-dihydropyridines accompanied by their applications in biological and pharmaceutical activities is presented. Spiro1,4-dihydropyridines were synthesized using numerous reported methods including bronested acids such as p-TSA, AcOH, nano-ranged calix[4]arene tetracarboxylic acid, sulfamic acid, PEG-OSO3H, tetramethylguanidinium triflate; lewis acids including Zn(OTf)2, FeCl3, copper, alum, aluminosilicate nanoparticles, MnFe2O4 nanoparticles, manganese ferrite nanoparticles, BF3OEt2; under alkaline conditions such as Et3N and piperidine; ionic liquids such as [KAl(SO4)2·12H2O] and [Bmim]PF6, [MIM(CH2)4SO3H][HSO4]; and other miscellaneous procedures, for example, microwave-assisted catalyst and solvent-free conditions, using iodine, PEG-400, and NaCl.

Preparation and application of polyaldehyde trehalose as a new hydrophilic anti-crease finishing agent for cotton fabric

Polyaldehyde trehalose (OTr) was prepared and applied to cotton fabric as an anti-crease finishing agent under Lewis acid conditions. OTr contains reactive groups (aldehyde groups) and hydrophilic groups (hydroxyl groups). After the aldehyde groups crosslink with the hydroxyl groups of the fibers, the hydroxyl groups of the OTr improve the hydrophilicity of the finished fabric. The target product was characterized by Fourier transform infrared spectroscopy and proton nuclear magnetic resonance. The optimum process conditions for anti-crease finishing were studied. The optimal anti-crease finishing process for OTr was 10.0%, a MgCl2concentration of 2.0%, a pH of 3, and curing for 3 min at 150℃. The efficiency of the OTr-treated cotton fabrics was examined, and the anti-crease property, whiteness, tensile strength, hydrophilicity, and staining property of the OTr and conventional anti-crease finishing reagents were compared. The anti-crease property, whiteness, and tensile strength of the OTr-treated fabric improved significantly, but were lower than those of the butane tetracarboxylic acid and glutaraldehyde. Fabric that was treated with the new prepared agent presented a satisfactory hydrophilicity, which indicates that OTr can be used as an effective hydrophilic crosslinking agent.

Near-infrared luminescent Nd3+/Yb3+-codoped metal–organic framework for ratiometric temperature sensing in physiological range

Self-calibrating luminescent thermometry employing luminescence within the optical transparency windows provides a promising prospect for temperature measurement in the biological fields. In this work, a new Nd3+/Yb3+-codoped metal–organic framework Nd0.95Yb0.05BPTC showing three-dimensional anionic network, obtained by reacting ligand [1,1′-biphenyl]-3,3′,5,5′-tetracarboxylic acid (H4BPTC) with Nd3+ and Yb3+ ions under solvothermal conditions, is reported. Upon 808 nm photoexcitation, Nd0.95Yb0.05BPTC simultaneously emits the characteristic near-infrared luminescence of Nd3+ and Yb3+ ions based on the efficient energy transfer from Nd3+ to Yb3+ ions. In addition, the emission intensity ratio of Yb3+ and Nd3+ shows good exponential-like response to temperature in the physiological range of 293–323 K. The feature properties of Nd0.95Yb0.05BPTC include near-infrared absorption and emission, favorable temperature sensitivity and accurate temperature uncertainty, as well as good chemical stability, making such system useful in biomedical applications.

A dual luminescent sensor coordination polymer for simultaneous determination of ascorbic acid and tryptophan.

Simultaneous high sensitivity detection of biomolecules is important for research in medicine, living cells and environmental samples. In this work, a water stable coordination polymer, [Cd2(bptc)(4,4'-bpy)(H2O)3]ˑH2O 1 (H4bptc=2,3,3',4'-biphenyl tetracarboxylic acid, 4,4'-bpy=4,4'-bipyridine), was designed and successfully synthesized as a luminescent sensor for simultaneous recognition of Ascorbic Acid (AA) and L-Tryptophan (L-Trp) based on luminescent -OFF and -ON, respectively. Importantly, the proposed sensing system showed an excellent performance with high KSV values of 4.85×104M-1, 9.60×107M-1 and low limit of detection (LOD) of 0.28nM, 63nM, respectively. In addition, the probable mechanisms are also discussed. The luminescent quenching behavior by AA can be mainly attributed to the static resonance energy transfer between complex 1 and the analytes. Whereas the enhancing effect of L-Trp comes from the intrinsic strong luminescence for L-Trp itself and photo-competitive mechanism between CP 1 sensor and L-Trp, supposedly. In addition, the repeatability of both systems were also investigated.

Improved HPLC Conditions to Determine Eumelanin and Pheomelanin Contents in Biological Samples Using an Ion Pair Reagent.

Alkaline hydrogen peroxide oxidation (AHPO) of eumelanin and pheomelanin, two major classes of melanin pigments, affords pyrrole-2,3,5-tricarboxylic acid (PTCA), pyrrole-2,3-dicarboxylic acid (PDCA) and pyrrole-2,3,4,5-tetracarboxylic acid (PTeCA) from eumelanin and thiazole-2,4,5-tricarboxylic acid (TTCA) and thiazole-4,5-dicarboxylic acid (TDCA) from pheomelanin. Quantification of these five markers by HPLC provides useful information on the quantity and structural diversity of melanins in various biological samples. HPLC analysis of these markers using the original method of 0.1 M potassium phosphate buffer (pH 2.1):methanol = 99:1 (85:15 for PTeCA) on a reversed-phase column had some problems, including the short lifetime of the column and, except for the major eumelanin marker PTCA, other markers were occasionally overlapped by interfering peaks in samples containing only trace levels of these markers. These problems can be overcome by the addition of an ion pair reagent for anions, such as tetra-n-butylammonium bromide (1 mM), to retard the elution of di-, tri- and tetra-carboxylic acids. The methanol concentration was increased to 17% (30% for PTeCA) and the linearity, reproducibility, and recovery of the markers with this improved method is good to excellent. This improved HPLC method was compared to the original method using synthetic melanins, mouse hair, human hair, and human epidermal samples. In addition to PTCA, TTCA, a major marker for pheomelanin, showed excellent correlations between both HPLC methods. The other markers showed an attenuation of the interfering peaks with the improved method. We recommend this improved HPLC method for the quantitative analysis of melanin markers following AHPO because of its simplicity, accuracy, and reproducibility.

Crystal structure, electrochemical reversibility, and photocatalytic degradation of a coordination unsaturated copper(II) based coordination polymer

A coordination unsaturated copper (II) coordination polymer, [Cu(tptc)0.5(bpy)(H2O)]n (1), was constructed from the mixed ligands of p-terphenyl-2,2′',5′',5′''-tetracarboxylate acid (H4tptc) and 1,3-bis(imidazol-1-ylmethyl)benzene (bimb) under hydrothermal condition. Structural analysis revealed that CP 1 is a 2D 4-connected {32∙62∙72} kgm polymeric sheet, which can be further expanded into 3D supramolecular through hydrogen bonds. The coordination unsaturated central Cu(II) ions endow the CP 1 open metal sites, displaying good electrochemical reversibility as well as high efficiency in photocatalytic degradation of methylene blue (MB) under UV irradiation.

Synthesis of Peripherally Arylated Tetrathiafulvalenes Extended with an Anthraquinoid Spacer via Pd-Catalyzed C–H Arylation and Construction of a Double-Helical Cobalt-Based Metal-Organic Framework

Peripherally arylated tetrathiafulvalenes with an anthraquinoid spacer (TTFAQs) have been synthesized by using palladium-catalyzed direct C–H arylation of the 1,3-dithiole rings. Electrochemical analysis by cyclic voltammetry has revealed that the new tetraarylated TTFAQs show one pair of simultaneous two-electron transfer waves as the parent TTFAQ does. The hydrolysis of the tetra(p-ethoxycarbonylphenyl)-substituted derivative affords the corresponding tetracarboxylic acid, which forms a new double-helical metal-organic framework upon complexation with cobalt(III) nitrate.

A highly selective luminescent logic gates probe based on Cd-LMOF for pH detection

Abstract pH value is an important parameter to reflect water quality, reaction process and health condition. Thus, it is of great significance to develop a rapid and sensitive method for pH detection. Herein, a 3D porous framework {[Cd1.5(TPTA)(Me2NH)]·0.5 Methanol·0.5 H2O}n (LMOF 1) based on an amphoteric ligand of 2′-amino-[1,1′,4′,1″-terphenyl]-3,3″,5,5″- tetracarboxylic acid (H4TPTA) has been synthesized by solvothermal method. Fluorescence properties show that LMOF 1 can rapidly and sensitively recognize pH without being affected by other ions. In addition, to quickly recover LMOF 1, the magnetic composite γ-Fe2O3@LMOF 1 was successfully prepared by loading the magnetic γ-Fe2O3 nanoparticles onto LMOF 1. The composite is easily separated from the suspension by the magnet. After washing, the recognition performance of γ-Fe2O3@LMOF 1 for pH is almost the same as the original sample after three cycles. Meanwhile, the PXRD patterns and the TG curve of γ-Fe2O3@LMOF 1 after luminescence experiments indicate that the composite has good chemical and acid-base stability. Based on the relationship between the luminescence change of LMOF 1 and pH ranging from 3 to 7, an IMPLICATION-type logic gate in luminescence mode is constructed with pH = 3 and pH = 7 as chemical input.

The self-assembly of a low symmetric aromatic carboxylic acid with meta-carboxyl groups regulated by pyridine derivatives

A new kind of low symmetric aromatic tetra-carboxylic acids H4BCPIA molecules self-assembled and were regulated by two kinds of pyridine derivatives on the heptanoic acid/HOPG interface. H4BCPIA molecule self-assembled into dimers as basic units through meta-carboxyl groups and formed into networks with quadrilateral cavities. With the participation of pyridine derivatives, the dimers were broken by DPE molecules and reformed into zigzag lines. After introducing PEBP-C4 molecules, H4BCPIA dimers formed into honeycomb networks, which PEBP-C4 molecules were trapped in. By observing the influence of the pyridine derivatives on the structures of H4BCPIA dimers, the strength of O–H•••N hydrogen bonds and the meta-dicarboxylic hydrogen bonds were compared. The hydrogen bonding strength of O–H•••N hydrogen bonds formed by DPE and H4BCPIA, O–H•••O dihydrogen bonds formed by meta-carboxyl groups between H4BCPIA, and O–H•••N hydrogen bonds formed by PEBP-C4 and H4BCPIA decreased in order. The investigation of H4BCPIA self-assembly structures had great reference value for the meta-carboxyl groups self-assembly behavior.

Ratiometric fluorescence temperature sensing based on single- and dual-lanthanide metal-organic frameworks

The ever increasing demand for fast, noninvasive, and accurate determination of temperature at the submicrometer spatial regime, particularly in microelectronic diagnostics, is driving the development of ratiometric temperature probes. In this work, we present two types of self-calibrating metal-organic framework (MOF) thermometers with both the organic chromophore and lanthanide emissions, which proposed an elegant avenue to address these concerns. By employing the symmetric tetracarboxylate ligand [1,1':4′,1″-Terphenyl]-3,3″,5,5″-tetracarboxylic acid, we synthesized and investigated single- and dual-lanthanide MOFs, TbTPTC and GdxEu1-xTPTC, in terms of their temperature dependent luminescence. Based on the energy-back transfer of lanthanide ion to ligand, the intensity ratio between the ligand and lanthanide of both the single- and dual-lanthanide MOF systems exhibits distinctly exponential response to temperatures in the range of 313–473 K. Given their good relative sensitivities, accurate temperature resolution, and excellent repeatability, as well as sensitivity to color change, the proposed dual-emitting MOF materials can be useful for thermal mapping and hot-spot monitoring of microelectronic devices.

A new anionic metal–organic framework with suitable pore and PtS-type topology for selective adsorption and separation of cationic dyes

An anionic metal organic framework (Me2NH2)2[In2(H4TTBA)2](DMF)(H2O)15 (In-MOF-1; H4TTBA = 2′-amino-[1,1′:4′,1″-terphenyl]-3,3″,5,5″-tetracarboxylic acid, DMF = N,N-dimethylformamide) with suitable channels and PtS-type topology was synthesized and characterized. In-MOF-1 has three types of channels along a, b, c axis that displays the adsorption and selective separation ability toward the low concentration of small cationic dye molecules from water solution at room temperature.

Preventing Undesirable Structure Flexibility in Pyromellitate Metal Organic Frameworks

Removal of coordinated water molecules from the porous Zn‐pyromellitate metal organic framework Zn5(OH)2(PMA)2(H2O)4·xH2O (PMA = pyromellitic acid or 1,2,4,5‐benzene tetracarboxylic acid) should generate coordinatively unsaturated metal sites suitable for gas adsorption. However, reports of instability towards dehydration have restricted the study and utility of this MOF. Here we examine in more detail the nature of the structural transformation that occurs upon dehydration. This study reveals that a fully reversible crystalline‐crystalline transformation from a porous to a non‐porous homologue takes place, proceeding through a partially dehydrated intermediate. We show that doping the structure with Ni2+ ions at greater than 30 % prevents structural rearrangement, thereby maintaining porosity, and rendering the material effective for gas (nitric oxide) adsorption applications. These results indicate that doping can be an effective means to increase the utility of otherwise unserviceable structures.

RETRACTED: Fluorescent sensing study and prevention ability on Alzheimer’s disease by reducing the oxidative stress injury in the nerve cells of two Zn(II) coordination polymers

Abstract By using terphenyl-3,3″,5,5″-tetracarboxylic acid (H4tptc) ligand and different N-donor co-ligands, two Zn(II)-based coordination polymers (CPs) {[Zn(tptc)(1,2-bimb)2]·4.5(H2O)}n (1, 1,2-bimb ​= ​1,2-bis (imidazol-1-ylmethyl) benzene) and {[Zn3(Htptc)2(2,2´-bpy)2]·1.5H2O}n (2, 2,2´-bpy ​= ​2,2´-bipyridine) were prepared. Compound 1 could be used as a sensor for Fe3+ ion with a low detection limit. To develop novel candidates for Alzheimer’s disease (AD) treatment, ELISA detection kit was used to determine the Aβ 40 and Aβ 42 content produced in nerve cells. RT-PCR was carried out to measure the ROS related genes relative expression levels, for example, pg91 and gp21.

POSSIBLE PROTECTIVE ROLE OF SODIUM SALICYLATE NANOEMULSION AND GINGER ON CISPLATIN‑INDUCED HEPATOTOXICITY IN RATS (BIOCHEMICAL AND HISTOPATHOLOGICAL STUDY)

Objective: To describe the preparation and characterization of nanoemulsion of sodium salicylate loaded butane tetracarboxylic acid (Bt-Sc-NPs). It also investigates the possible protective effects of Bt-Sc-NPs and\or medicinal plant ginger to evaluate the changes of liver functions, oxidative stress and histopathological investigations against cisplatin-induced hepatotoxicity.
 Methods: Serum was used to determine alanine aminotransferase (ALT), aspartate aminotransferase (AST), δ-glutamyl transferase (δGT), serum human laminin (LN) and tissue inhibitors of metalloproteinase1 (TIMP1). Liver tissue samples collected from the rats were used for the measurement of malondialdehyde (MDA), nitric oxide (NO) and paraoxonase 1 (PON1).
 Results: The beneficial effects of Bt-Sc-NPs with its anti-inflammatory effect and the medicinal ginger with its antioxidant effect were observed. Injection of rats with cisplatin significantly increased serum ALT, AST, ɤGT, TIMP1 and LN. It also increased cisplatin-induced oxidative stress by a significant elevation in liver MDA, NO content; however, a significant decrease of PON1 content. While protection with Bt-Sc-NPs or ginger significantly improved these parameters. In addition, combination of both Bt-Sc-NPs and ginger significantly induced a decrease in serum ALT, AST, ɤGT, TIMP1 and LN. It also reduced cisplatin-induced oxidative stress by the significant reduction in liver MDA, NO content and elevation of PON1 content much more than protection with Bt-Sc-NPs or ginger alone.
 Conclusion: Bt-Sc-NPs were synthesized using nanoemulsion with the help of homogenization and ultra-sonication waves. Combination with both of Bt-Sc-NPs and ginger showed a hepatoprotective role in ameliorating cisplatin‑induced hepatotoxicity due to their anti-inflammatory and antioxidant effects.

Two ZnII-based MOFs constructed with biphenyl-2,2′,5,5′-tetracarboxylic acid and flexible N-donor ligands: syntheses, structures and properties

Two new Zn2+-based metal-organic frameworks (MOFs) based on biphenyl-2,2',5,5'-tetracarboxylic acid, i.e. H4(o,m-bpta), and N-donor ligands, namely, poly[[(μ4-biphenyl-2,2',5,5'-tetracarboxylato)bis{[1,3-phenylenebis(methylene)]bis(1H-imidazole)}dizinc(II)] dimethylformamide monosolvate dihydrate], {[Zn2(C16H6O8)(C14H14N4)2]·C3H7NO·2H2O}n or {[Zn2(o,m-bpta)(1,3-bimb)2]·C3H7NO·2H2O}n (1) {1,3-bimb = [1,3-phenylenebis(methylene)]bis(1H-imidazole)}, and poly[[(μ4-biphenyl-2,2',5,5'-tetracarboxylato)bis{[1,4-phenylenebis(methylene)]bis(1H-imidazole)}dizinc(II)] monohydrate], {[Zn2(C16H6O8)(C14H14N4)2]·H2O}n or {[Zn2(o,m-bpta)(1,4-bimb)2]·H2O}n (2) {1,4-bimb = [1,4-phenylenebis(methylene)]bis(1H-imidazole)}, have been synthesized under solvothermal conditions. The complexes were characterized by IR spectroscopy, elemental analysis, single-crystal X-ray diffraction and powder X-ray diffraction analysis. Structurally, the (o,m-bpta)4- ligands are fully deprotonated and combine with Zn2+ ions in μ4-coordination modes. Complex 1 is a (3,4)-connected porous network with honeycomb-like [Zn2(o,m-bpta)]n sheets formed by 4-connected (o,m-bpta)4- ligands. Complex 2 exhibits a (2,4)-connected network formed by 4-connected (o,m-bpta)4- ligands linking Zn2+ ions in left-handed helical chains. The cis-configured 1,3-bimb and 1,4-bimb ligands bridge Zn2+ ions to form multi-membered [Zn2(bimb)2] loops. Optically, the complexes show strong fluorescence and display larger red shifts compared to free H4(o,m-bpta). Complex 2 shows ferroelectric properties due to crystallizing in the C2v polar point group.