3-nitrophthalic Acid Research Articles

Syntheses, structures, and properties of four novel Ag(I) coordination polymers based on 2,6-dimethylpyrazine and benzene dicarboxylates

Four silver(I) coordination polymers based on 2,6-dimethylpyrazine(dmpz), {Ag2(dmpz)(L1)}n (1), {Ag2(dmpz)(L2)}n (2), {Ag2(dmpz)(L3)0.5·H2O}n (3) and {Ag6(dmpz)6(L4)2·2H2O}n (4) (H2L1=5-Nitroisophthalic acid, H2L2=3-Nitrophthalic acid, H4L3=Pyromellitic acid, H2L4=5-Sulfoisophthalic acid), were synthesized under the ammoniacal condition in mixed solvents and characterized by elemental analyses, IR spectra and single-crystal X-ray diffraction. 1 contains rhombic Ag4 unit, but 4 exhibits Zigzag Ag4 unit, both with 2D double layer architecture. In 2, L2 anions link Ag pairs into 1D corrugated chains, which are further connected by dmpz ligand into 2D 44-sql network. 3 possess 3D supramolecular framework resulting from AgO and AgN interaction and Zigzag Ag4 units. AgAg interactions exist in four coordination polymers. Benzene dicarboxylates and pyrazine ligands play vital roles in formation of the multiple architectures. Photoluminescence and thermogravimetry of the complexes were also measured.

Synthesis, crystal structures, luminescence, and photocatalytic properties of two 1D Co(II) coordination polymers constructed with semirigid bis(benzimidazole) and dicarboxylate ligands

Two ternary cobalt(II) coordination polymers (CPs), namely [Co(L1)(npht)] n (1) and {[Co2(L2)2(npht)2(H2O)]·H2O} n (2) (L1 = 4,4′-bis(benzimidazol-1-ylmethyl)biphenyl, L2 = 1,2-bis(5,6-dimethylbenzimidazol-1-ylmethyl)benzene, and H2npht = 4-nitrophthalic acid) have been synthesized and structurally characterized by X-ray crystallography. Both CPs feature similar 1D infinite chains containing two distinct loops. CP 1 further forms a 3D supramolecular network via weak C–H···O hydrogen bond interactions. CP 2 shows a 1D two-layer chain structure, assembled through π–π stacking interactions. The electrochemical, luminescence, and photocatalytic activities of the two CPs for the removal of methylene blue under visible or UV light were investigated. Possible photocatalytic mechanisms are discussed.

Ultrasonic green synthesis of an Ag/CP nanocomposite for enhanced photodegradation effectiveness

A nanoparticle of cobalt(II) coordination polymer (CP), [Co(L)(npht)]n (1) (H2npht=4-nitrophthalic acid, L=1,3-bis(5,6-dimethylbenzimidazol-1-ylmethyl)benzene) and its nanocomposite (Ag/CP 1) were obtained by the sonochemical approach and characterized by IR, elemental analysis, thermogravimetric analyses (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray powder diffraction (XRPD). CP 1 shows a 1D double chain containing two different helical chains, which is further extended into a two-dimensional supramolecular framework by C–H⋯O hydrogen bonding interactions. The photoluminescence properties and photocatalytic properties of the nanoparticles of CP 1 and Ag/CP 1 on the degradation of methylene blue (MB) were investigated, Ag/CP 1 exhibited excellent photocatalytic activity under UV and visible light, which can be attributed to the strong interactions between Ag nanorods and CP 1, which lead to electron–hole pair separation between Ag nanorods and CP 1. In addition, the photocatalytic mechanism is also carried out by introducing t-butyl alcohol (TBA) as a widely used ·OH scavenger. The influence of ultrasound irradiation time and power on the morphology and size of the nanostructure CP 1 were studied. The results indicated that a decrease in time and an increase in power led to a decrease of particle size.

Four new silver-based complexes constructed from 3-nitrophthalic acid and pyrazine-like ligands: Syntheses, crystal structures and photodegradation activities

Four Ag-based coordination polymers, Ag4(H2O)2(npth)2 (1), Ag4(epyz)2(npth)2 (2), [Ag(pyz)(Hnpth)]·H2O (3) and Ag(epyz)0.5(Hnpth) (4) (H2npth=3-nitrophthalic acid, pyz=pyrazine, epyz=2,3,5,6-tetramethylpyrazine), have been synthesized by ultrasonic or hydrothermal reactions of Ag(I) salts with H2npth and various pyrazine derivatives ligands. Compound 1 presents a 2D 44-sql network with Ag4 units, and compound 2 features novel cage-like Ag8 SBUs (secondary building unit), which are linked by epyz ligands to form a 3D framework. Compound 3 shows a 1D chain and compound 4 exhibits a 2D coordination polymer construction. The photocatalytic properties for the degradation of organic dye molecules have been examined, and the experiments show that compound 3 has a good degradation effect to Rhodamine B.

Organic salts formed by 2,4,6-triaminopyrimidine and selected carboxylic acids via a variety of hydrogen bonds: Synthons cooperation, and crystal structures

By using solvent evaporation method, 2,4,6-triaminopyrimidine (TAPI) is employed to crystallize with a variety of acids, including 3,5-dihydroxybenzoic acid (HDHBA), 3-nitrophthalic acid (H2NPA), 5-amino-2,4,6-triiodoisophthalic acid (H2ATIPIA), 2,5-dibromoterephthalic acid (H2DBTPA), 1,5-naphthalenedisulfonic acid (H2NDSA), sebacic acid (H2SA), 1,2,4-benzenetricarboxylic acid (H3BTA), and biphenyl-2,2′,5,5'-tetracarboxylic acid (H4BPTA). In all eight complexes, protons are completely exchanged from O atom of acid to nitrogen of TAPI in 1, 3, 4, and, 5, partly transferred in 2, 6, 7, and 8. The crystal structure of all eight complexes exhibit that classical robust hydrogen bonds X-H⋯X (X = O/N) direct the molecular crystals to bind together in a stacking modes. Classical hydrogen bond NH⋯O is participated in forming all eight organic salts, while hydrogen bonding OH⋯O are found in constructing the diversity structures in salts 1, 2, 3, 4, 6, and 7. The analysis shows that some classical supramolecular synthons, such as I R22(8), V R24(12), and VI S(6), are observed again in the construction of hydrogen-bonding networks. In the formation of layered and reticular structure, strong hydrogen bonds between water molecules and ligands having well-refined hydrogen atoms have been considered. Water molecules play an important role in building supramolecular structures of 1, 2, 3, 4, 7, and 8. Moreover, salts 1-8 are further characterized and analyzed by element analysis, infrared radiation, thermogravimetric analysis, proton nuclear magnetic resonance spectra, and mass spectra.

Two new Ag (I) supramolecular complexes based on melamine: Synthesis, structures and photocatalytic activity under visible light irradiation

Two new supramolecular complexes [Ag2(MA)2(2-nbd)]·2.5H2O (1) and [Ag2(MA)2(3-npa)]·2H2O (2) (2-H2nbd=2-nitroterephthalic acid; MA=melamine; 3-H2npa=3-nitrophthalic acid) have been synthesized under ultrasound conditions and characterized by infrared spectra (IR), thermogravimetric analysis (TGA), elemental analyses (EA) and X-ray diffraction (XRD). Complex 1 exhibits 2D framework through the bridging of carboxylic acid ligand and melamine ligand. Complex 2 presents a binuclear silver structural unit, which was further construct to three-dimension structure via hydrogen-bond interaction. The photocatalytic performance and photoluminescent properties of them were also investigated. And the results show that complex 1 and 2 exhibited good photocatalytic activity towards the degradation of Rhodamine B (RhB) and Methylene Blue (MB) under visible light irradiation. Moreover, it is verified that the degradation rate fits the first-order kinetics.

Structural variability, Hirshfeld surface analysis and properties of three Zn(II) coordination polymers based on flexible bis(thiabendazole) and aromatic dicarboxylate co-ligands

Three zinc(II) coordination polymers (CPs), {[Zn(L)0.5(tbta)]·0.5 L·2.5H2O}n (1), {[Zn(L)0.5(mip)]·H2O}n (2) and {[Zn(L)0.5(npht)(H2O)]·0.5H2O}n (3) (L = 1,4-bis(thiabendazole)butane, H2tbta = tetrabromoterephthalic acid, H2mip = 5-methylisophthalic acid, H2npht = 3-nitrophthalic acid) have been hydrothermally synthesized and structurally characterized. Single-crystal X-ray diffraction analyses reveal that CP 1 shows a 2D honeycomb-like (6, 3) network. CP 2 displays a hybrid helical chain, and further assembled into a 2D supramolecular layer via weak CH⋯O hydrogen bonding interactions, whereas CP 3 is a right-handed helical chain and finally extended into a 3D supramolecular structure by classical OH⋯O hydrogen bonds and π–π stacking interactions. Further, the Hirshfeld surfaces, fingerprint plots, fluorescence properties and catalytic performances of three CPs for the degradation of methyl orange dye in a Fenton-like process have been investigated.

Crystal Structures of Three Organic Adducts Produced by N6-Benzyladenine, Trichloroacetic Acid, 3-Nitrophthalic Acid, and Citric Acid

Three organic adducts of N6-benzyladenine have been prepared with trichloroacetic acid, 3-nitrophthalic acid, and citric acid. The three crystalline complexes were characterized by X-ray diffraction analysis, IR, mp, and elemental analysis. Compound 1 crystallizes in the triclinic, space group P-1, with a = 5.4634(4) A, b = 9.7180(7) A, c = 15.9707(12) A, α = 84.2100(10)°, β = 86.633(2)°, γ = 78.0640(10)°, V = 824.75(10) A3, Z = 2. Compound 2 crystallizes in the triclinic, space group P-1, with a = 7.4065(7) A, b = 8.1151(8) A, c = 18.4782(15) A, α = 95.3190(10)°, β = 90.7750(10)°, γ = 115.063(2)°, V = 1000.00(16) A3, Z = 2. Compound 3 crystallizes in the triclinic, space group P-1, with a = 5.0883(5) A, b = 13.0295(11) A, c = 16.4332(14) A, α = 69.1550(10)°, β = 83.900(3)°, γ = 79.244(2)°, V = 999.35(15) A3, Z = 2. In 1, the N9 atom was protonated, thus 1 is a salt. For 2 and 3, all carboxyl groups remain protonated, so 2 and 3 are both cocrystal. These structures adopted homo or hetero supramolecular synthons or both. Analysis of the crystal packing of 1–3 displays that there are O–H···O, O–H···N, N–H···O, and N–H···N hydrogen bonds as well as C–H···O, CH2···O, C–H···Cl, O–O, O–N, Cl···N, Cl···O, Cl···π, CH2···π, and π···π interactions, giving 2D/3D framework structures. The crystal structures of the N6-benzyladenine adducts with trichloroacetic acid, 3-nitrophthalic acid, and citric acid show extensive classical hydrogen bonding as well as C–H···O, CH2···O, C–H···Cl, O–O, O–N, Cl···N, Cl···O, Cl···π, CH2···π, and π···π interactions, giving 2D/3D framework structures.

Preparation and lower critical solution temperature behavior investigation of new thermoresponsive poly(N-isopropylacrylamide-co-phthalocyanine) magnetic nanocomposites containing phthalocyanine-coated Fe3O4 hybrid

New thermoresponsive poly(N-isopropyl acrylamide-co-phthalocyanine) magnetic nanocomposites were prepared by in situ dispersion polymerization. 4-Nitrophthalic acid and CoCl2 were employed to synthesize tetranitrophthalocyanine and then it was converted to tetraaminophthalocyanine by sodium sulfide. The cobalt tetra(N-carbonylacrylic)aminophthalocyanine monomer was obtained by reaction of tetraaminophthalocyanine with maleic anhydrid. N-isopropylacrylamide as the main monomers, N,N′-methylenebisacrylamide as the cross-linker, poly(N-vinylpyrrolidone) as the steric stabilizer, potassium persulfate as the initiator, and new Fe-phthalocyanine oligomer/Fe3O4 nanohybrid particles (FePc/Fe3O4) as nanoparticles were used. The magnetite nanocomposites were characterized by Fourier-transform infrared spectrum, X-ray diffraction spectroscopy, scanning electron microscopy, thermogravimetric analysis, vibrating sample magnetometer, and differential scanning calorimetry. The results showed that the lower critical solution temperatures of the hydrogel nanocomposits were influenced by the content of FePc/Fe3O4 hybrid nanoparticles. The lower critical solution temperatures of the magnetic hydrogel nanocomposites F3 and F4 were at about 34 and 40 °C. The results show that the increase of FePc/Fe3O4 nanoparticle content caused the LCSTs of the hydrogels to increase. FePc/Fe3O4 nanoparticles were prepared from 4,4′-isopropyliden-bis-dioxydiphthalonitrile and FeCl3·6H2O via the solvothermal route. The sizes of nanoparticles were determined by scanning electron microscopy. They are spherical in shape and the average size of them is between 30 and 70 nm.

A liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for the human biomonitoring of non-occupational exposure to the fragrance 2-(4-tert-butylbenzyl)propionaldehyde (lysmeral)

2-(4-tert-Butylbenzyl)propionaldehyde also known as lysmeral, lilial, or lily aldehyde (CAS No. 80-54-6) is a synthetic odorant mainly used as a fragrance in a variety of consumer products like cleaning agents, fine fragrances, cosmetics, and air fresheners. Due to its broad application in various fields, lysmeral was selected for the development of a biomonitoring method for the quantitative exposure assessment within the frame of the cooperation project of the Federal Ministry for the Environment, Nature Conservation, Building and Nuclear Safety (BMUB) and the German Chemical Industry Association (VCI). A method based on ultra-high pressure liquid chromatography combined with tandem mass spectrometry (UPLC-MS/MS) was developed for the simultaneous determination of potential biomarkers of lysmeral in human urine samples. Sample cleanup was performed by liquid-liquid extraction (LLE). Quantification was achieved by standard addition using stable isotope-labeled, authentic reference standards. The method is characterized by its robustness, reliability, and excellent sensitivity as proven during method validation according to approved standard guidelines. The following five lysmeral metabolites were identified as potential biomarkers of exposure for lysmeral in human urine samples: lysmerol, lysmerylic acid, hydroxylated lysmerylic acid, tert-butylbenzoic acid (TBBA), and tert-butylhippuric acid (TBHA). The determination of lysmerol required derivatization with 3-nitrophthalic acid anhydride and showed the lowest limit of detection (LOD) and limit of quantification (LOQ) in urine (0.035 and 0.10μg/L, respectively). LOD and LOQ for the other metabolites were in the range of 0.12-0.15 and 0.36-0.45μg/L, respectively. Accuracy for all analytes was in the range of 90-110%. Intra- and inter-day precision was in the range of 5-10%, except for TBHA, for which the coefficient of variation was unacceptably high (>20%) and therefore excluded from the method. The method was applied to urine samples of 40 adult volunteers. The four remaining lysmeral metabolites were detectable in most of the 40 urine samples in the following order according to quantity excreted: TBBA >> lysmerol ≈ lysmerylic acid > hydroxy-lysmerylic acid. In conclusion, we successfully developed a biomonitoring method for the assessment of the exposure to lysmeral in the general population. The method is characterized by its precision, robustness, and accuracy. The metabolites lysmerol, lysmerylic acid, hydroxylated lysmerylic acid, and TBBA turned out to be suitable biomarkers of exposure to lysmeral, either alone or in combination with one or more of the other metabolites. Sensitivity was found to be sufficient for assessing the background exposure to this chemical in the general population.

Three cobalt(II) coordination polymers constructed from flexible bis(thiabendazole) and dicarboxylate linkers: crystal structures, fluorescence, and photocatalytic properties

Three Co(II) coordination polymers, namely, {Co(btbb)0.5(ndc)(H2O)}n (1), {[Co(btbb)(bpdc)]·1.5H2O}n (2), and {[Co(btbp)2(3-npa)]·2H2O}n (3) (btbb = 1,4-bis(thiabendazole)butane, btbp = 1,3-bis(thiabendazole)propane, H2ndc = 2,6-naphthalenedicarboxylic acid, H2bpdc = 4,4′-biphenyldicarboxylic acid and 3-H2npa = 3-nitro phthalic acid) were synthesized under hydrothermal conditions. Their X-ray crystal structures show that complexes 1 and 2 both have 2D uninodal 3-connected hcb (honeycomb) structures. Complex 1 is further extended into a threefold interpenetrating 3D 4,4-connected mog (moganite) supramolecular architecture with the point symbol of {4.64.8}2{42.62.82} by O–H···O hydrogen bonding interactions. Complex 2 shows a 3D supramolecular framework involving π···π stacking interactions. Complex 3 features a uninuclear structure, which is further assembled into an ordered 2D hydrogen-bonded-driven pattern with O–H···O and O–H···N hydrogen bonding interactions. The fluorescence spectra and photocatalytic properties of complexes 1–3 for degradation of methyl orange were investigated.

Crystal Structures of Two Salts from Piperidine, Naphthalene-1,5-Disulfonic Acid, and 4-Nitrophthalic Acid

Two anhydrous salts of piperidine have been prepared with naphthalene-1,5-disulfonic acid, and 4-nitrophthalic acid by slow evaporation technique, and their structures were fully characterized. These two structures adopted homo or hetero supramolecular synthons. Compound 1 crystallizes in the triclinic, space group P-1, with a = 7.728(3) A, b = 8.042(3) A, c = 9.150(3) A, α = 80.631(4)°, β = 79.433(4)°, γ = 86.531(4)°, V = 551.3(3) A3, Z = 1. Compound 2 crystallizes in the monoclinic, space group P2(1)/c, with a = 6.3466(5) A, b = 24.008(2) A, c = 9.0390(7) A, α = 90°, β = 97.0050(10)°, γ = 90°, V = 1367.01(19) A3, Z = 4. Analysis of the crystal packing of 1, 2 suggests that there are N–H···O hydrogen bonds between the acids and the piperidine in both compounds. Except the classical hydrogen bonds, the secondary propagating interactions including CH2···O, O···Cπ, and CH2···π interactions also play important roles in structure extension. In conclusion, we have shown that 3D structures can be constructed by collective non-covalent interactions. The crystal structures of the salts from piperidine, naphthalene-1,5-disulfonic acid, and 4-nitrophthalic acid are predominantly stabilized by classical hydrogen bonds as well as CH2···O, O···Cπ, and CH2···π interactions.

Crystal structure and fluorescence of a 1D zinc(II) coordination polymer based on a semi-rigid bis(benzimidazole) ligand

A new Zn(II) coordination polymer, {[Zn(npht)(L)0.5(H2O)]•H2O} n (L = 1,4-bis(2-methylbenzimidazol-1-ylmethyl)benzene, H2npht = 3-nitrophthalic acid) has been hydrothermally synthesized and characterized by elemental analysis, IR, XRPD, and single-crystal X-ray diffraction. The zinc(II) coordination compound exhibits a 1D linear chain, which is further assembled into a 2D supramolecular layer via two modes of classial hydrogen bonding interactions. The fluorescence properties and thermal stability of the complex have been investigated in the solid state.

Three New Cadmium Complexes Based on 3-Nitrophthalic Acid: Syntheses, Crystal Structures and Fluorescent Properties

Three metal–organic coordinate complexes based on 3-nitrophthalic acid (H2NPA), namely Cd2(H2O)(OH)2(NPA) (1), Cd2(Im)4(NPA)2 (2) and Cd2(Bim)4(H2O)(NPA)2 (3) (Im = imidazole, Bim = benzimidazole), have been obtained by hydrothermal method and characterized by X-ray single crystal structure determination. Structural analysis reveals that complex 1 exhibits 2D layers constructed by polyhedral aggregates. Complex 2 exhibits a dinuclear cadmium structural unit and assembles by hydrogen bonds into a 2D supramolecular architecture. Complex 3 is assembled by NPA2− into layers of a (3,4)-connected dinodal net topology of (4·52)(4·53·72). The fluorescent properties of complexes 1–3 have been investigated.

Crystal and Molecular Structures of Three Salts from Aliphatic Amines (2,4-Dichlorophenoxy)-acetic acid, 4-Nitrophthalic Acid, and 1,5-Naphthalenedisulfonic Acid

Three aliphatic amine derived supramolecular complexes were synthesized and structurally characterized by X-ray crystallography. All these structures adopted the hetero supramolecular synthons. Compound 1 crystallizes in the monoclinic, space group C2/c, with a = 40.328(7) A, b = 7.2054(14) A, c = 7.6464(17) A, α = 90o, β = 97.364(16)o, γ = 90o, V = 2203.6(8) A3, Z = 8. Compound 2 crystallizes in the monoclinic, space group P2(1)/n, with a = 7.4134(4) A, b = 18.3749(14) A, c = 12.1456(12) A, α = 90o, β = 104.227(2)o, γ = 90o, V = 1603.7(2) A3, Z = 4. Compound 3 crystallizes in the monoclinic, space group P2(1)/c, with a = 9.8804(7) A, b = 10.5061(8) A, c = 11.8262(9) A, α = 90o, β = 104.674(2)o, γ = 90o, V = 1187.57(15) A3, Z = 2. Analysis of the crystal packing of 1–3 suggests that there are N–H···O hydrogen bonds between the acids and the aliphatic amines in all of the compounds. Except the classical hydrogen bonds, the secondary propagating interactions including CH···O, CH2···O, CH2···Cl, CH3···π, and π···π interactions also play important roles in the structure extension. In conclusion, we have shown that 2D–3D structures can be constructed by the collective non-covalent interactions. The crystal structures of the salts from aliphatic amines, (2,4-dichlorophenoxy)-acetic acid, 4-nitrophthalic acid, and 1,5-naphthalenedisulfonic acid are predominantly stabilized by the classical hydrogen bonds as well as CH···O, CH2···O, CH2···Cl, CH3···π, and π···π interactions.

Three manganese(II) coordination polymers with mixed donor ligands: synthesis, X-ray structures and luminescence properties

Three new coordination polymers of manganese(II) of formulae [Mn3(phen)2(phdac)3]·2H2O (1), [Mn(4,4′-bipy)(H2O)4](cbprop)(2) and [Mn(2,2′-bipy)(4-nph)(H2O)2]2 (3) (phen = 1,10-phenanthroline, 4,4′-bipy = 4,4′-bipyridine, 2,2′-bipy = 2,2′-bipyridine, H2phdac = 1,4-phenylenediacetic acid, H2cbprop = 4-carboxybenzenepropanoic acid and H2nph = 4-nitrophthalic acid) have been synthesized and structurally characterized by X-ray single-crystal diffraction analysis. The metal complexes possess 2D (1), 1D (2) and 0D (3) dimensionalities. In each case, the crystal packing shows three-dimensional architecture by means of π–π interactions and/or hydrogen bonding supported by coordinated and lattice water molecules. The emission spectra show metal-perturbed intra-ligand π*–π charge transfer transitions for 1 and π*–π and π*–n charge transfer transitions for 3.

Tuning zinc(II) coordination architectures by rigid long bis(triazole) and different carboxylates: Synthesis, structures and fluorescence properties

Three metal–organic coordination polymers containing rigid bis(triazole) ligand, namely, [Zn1.5(btb)(nbta)(H2O)]n (1), {[Zn(btb)(3-nph)]·(H2O)}n (2) and [Zn(btb)(4-nph)]n (3) (btb=4,4′-bis(1,2,4-triazolyl-1-yl)-biphenyl, 3-H2nph=3-nitrophthalic acid, H3nbta=5-nitro-1,2,3-benzenetricarboxylic acid, and 4-H2nph=4-nitrophthalic acid) were synthesized under hydrothermal conditions and structurally characterized by X-ray single-crystal diffraction. Complex 1 possesses an interesting 3D coordination framework with a rarely binodal (4,4)-connected frl topological structure. Complexes 2 and 3 exhibit similiar 2D (4,4) grid layers with different point symbol (44·64) in 2 and (44·62) in 3. Furthermore, thermal stability of these compounds has been discussed. Complexes 1–3 exhibit strong solid-state fluorescence at room temperature in solid state.

Assemblies and Properties of Cobalt(ΙΙ) Coordination Polymers Based on the Substituted Phthalic Acid and N-Donor Co-ligands

Three new mixed ligated cobalt coordination polymers, [Co(3-NPA)(1,2-bimb)]n (1), [Co(4-NPA)(1,2-bimb)]n (2) and [Co(4-NPA)(bpe)(H2O)]n (3) (3-NPAH2 = 3-nitrophthalic acid, 4-NPAH2 = 4-nitrophthalic acid, 1,2-bimb = 1,2-bis(imidazol-1-ylmethyl)-benzene, bpe = 1,2-di(4-pyridyl)ethylene) have been hydrothermally synthesized and characterized by elemental analyses, IR spectra, and single-crystal and powder X-ray diffractions. Compounds 1 and 2 based on the same auxiliary N-donor ligand show different structures: 1 is a one-dimensional chain structure, while 2 features a two-dimensional layered structure. The structural differences between 1 and 2, which involve the same metal ion and 1,2-bimb ligand, could be attributed to the different coordination modes of 1,2-bimb molecule. In compound 3, a one-dimensional chain structure connected by the carboxylate groups and the Co(ΙΙ) ions, which are further linked by the bpe molecules to give a two-dimensional layered structure. Thermal stabilities of 1–3 were also investigated. Dominant antiferromagnetic interactions are propagated between the magnetic centers in 3.

The 1:1 Proton-Transfer Compounds of N,N -dimethyl-4-[(E)-2-(4-pyridinyl)vinyl]aniline with 3-Nitrophthalic and Perchloric acids

The crystal structures of the 1:1 proton-transfer compounds of the dipolar donor-π-acceptor compound N,N-dimethyl-4-[(E)-2-(4-pyridinyl)vinyl]aniline (1), also named dimethylamino-stilbazole, with 3-nitrophthalic and perchloric acids, viz. (E)-4-[4-(dimethylamino)styryl]pyridinium 2-carboxy-3-nitrobenzoate monohydrate (2) and (E)-4-[4-(dimethylamino)styryl]pyridinium perchlorate (3) are described. A redetermination of the structure of the parent free base 1 at 100 K is also reported. The (E)-4-[4-(dimethylamino)styryl]pyridinium ion exhibits slight whole molecule disorder in 2 and 3. Compound 2 is the first organic salt that contains the unusual monoanion of 3-nitrophthalic acid that is deprotonated at the 1-carboxyl group. The crystal structures of the 1:1 proton-transfer compounds of the dipolar donor-π-acceptor compound N,N-dimethyl-4-[(E)-2-(4-pyridinyl)vinyl]aniline with 3-nitrophthalic and perchloric acids, viz. (E)-4-[4-(dimethylamino)styryl]pyridinium 2-carboxy-3-nitrobenzoate monohydrate and (E)-4-[4-(dimethylamino)styryl]pyridinium perchlorate are described.

Crystal structure, infrared spectra and luminescence of a 1D Cd coordination polymer with 4-nitrophthalic acid and 1,10-phenanthroline monohydrate ligands

A new one-dimensional (1D) coordination polymer, [Cd(NPTA)(1,10-phen)(H2O)]n (1) (H2NPTA = 4-nitrophthalic acid; 1,10-phen = 1,10-phenanthroline monohydrate), has been synthesized under hydrothermal conditions and characterized by elemental analysis, single-crystal X-ray diffraction, solid state emission spectra, FT-IR spectra, and thermogravimetric analyses. The compound belongs to triclinic system with space group \(P \bar 1\), and exhibits a one-dimensional linear chain. Each Cd with a strongly distorted octahedral coordination geometry is six-coordinated by two N atoms from one 1,10-phenanthroline ligand, three O atoms from two carboxylate groups of two different NPTA2− ligands and one O atoms from lattice water. Layer supramolecular architecture is formed by medium π-π stacking interactions between two neighboring phenanthroline rings from two independent linear chains. Studies on luminescent property of 1 exhibit the solid state emission originating from an intra ligand π → π* transition of NPTA2− ligand.