•An acentric coordination polymer based on H3PIDC has been synthesized.•The 3D structure can be simplified as a rare noninterpenetrated (10,3)-d topology.•Compound 1 features ferroelectric, NLO and antiferromagnetic behaviors.A new coordination polymer, {[Mn(HPIDC)(H2O)]·2H2O}n (1) (H3PIDC = 2-(pyridin-4-yl)-1H-imidazole-4,5-dicarboxylic acid), has been obtained by hydrothermal method and structurally characterized by X-ray single crystal diffraction, elemental analysis and thermogravimetric analysis (TGA). X-ray single crystal diffraction reveals that compound 1 crystallizing in acentric Pna21 space group, exhibits an ultimate racemic three-dimension framework with rare noninterpenetrated (10,3)-d (or utp) topology due to the alternate array of left- and right-handed helixes. Moreover, compound 1 also features ferroelectric, nonlinear optical (NLO) and antiferromagnetic behaviors.An acentric coordination polymer has been synthesized and characterized by single-crystal X-ray diffraction, IR spectrum, elemental analysis, thermogravimetric analysis, ferroelectric, nonlinear optical and magnetic measurements.

•Two novel polymers based on 1,4-cyclohexanedicarboxylic acid have been synthesized.•Compounds 1 and 2 feather 1D chain structure built up from paddle-wheel SBUs.•The magnetism of 2 is investigated.•The electrochemical property and luminescent property of 1 are investigated.The compounds [Co(e,a-cis-1,4-chdc)(phdat)]n (1) and [Cd(e,a-cis-1,4-chdc)(phdat)]n (2) have been synthesized under hydrothermal method by using 1,4-cyclohexanedicarboxylic acid (1,4-H2chdc), 2,4-diamino-6-phenyl-1,3,5-triazine (phdat) as well as CoCl2·6H2O, CdCl2·2.5H2O respectively and characterized by IR spectra, X-ray single-crystal diffraction, powder X-ray single-crystal diffraction (PXRD), elemental analyses and thermogravimetric analyses (TGA). The results show the compounds 1 and 2 are isomorphous and exhibit paddle-wheel dinuclear Co2(CO2)4/Cd2(CO2)4 units, which are further connected to 1D chain structures by μ4:η1:η1:η1:η1 1,4-chdc2– ligands and extended into a 3D structures via different hydrogen bonding and π…π stacking interactions. Furthermore, compound 1 exhibits antiferromagnetic behavior and compound 2 displays luminescent behavior at solid state.Two isomorphous coordination compounds 1–2 have been synthesized and characterized by XRD, IR spectra and TGA etc. Compound 1 and 2 display antiferromagnetic behavior and luminescent behavior respectively.

•Four lanthanide coordination polymers have been synthesized by hydrothermal methods.•All of them adopt rare coordinated modes based on citric acid.•1 displayed color-pure red luminescent behavior.•1 and 3 exhibited antiferromagnetic behaviors and 2 exhibited ferromagnetic behavior.Four new isostructural lanthanide coordination polymers [Ln(Hcit)(H2O)2·2H2O]n (H4cit = citric acid) (Ln = Sm (1), Gd (2), Er (3), Nd (4)) have been synthesized under hydrothermal method by using citric acid, melamine as well as Sm(NO3)3·6H2O (1), Gd(NO3)3·6H2O (2), Er(NO3)3·6H2O (3), Nd(NO3)3·6H2O (4), and structurally characterized by FT-IR, thermogravimetric analyses (TGA), powder X-ray diffraction (PXRD), elemental analyses and X-ray single-crystal diffraction. The X-ray single-crystal diffraction analyses demonstrated that Hcit3- ligand adopt the rare coordination mode to connect the metal atoms of complexes 1–4 by chelating carboxyl group, single coordinated carboxyl group and hydroxyl group, forming left-handed and right-handed helical chains, which are further connected to 2D layer structures by Ln–O bonds. Furthermore, complex 1 displayed good fluorescence at solid state; complexes 1 and 3 exhibited antiferromagnetic behaviors, while complex 2 displayed ferromagnetic behavior.Download high-res image (186KB)Download full-size image

A novel bilayer metal–organic framework is assembled with a perfect intralayer triangular subnet and ideal interlayer Td arrangement between unprecedented crown-like Co7 cluster units, exhibiting high spin frustration.

Based on the ligand 1,2-H2bdc (1,2-H2bdc = 1,2-benzenedicarboxylic acid), three 2D coordination polymers [Mn(1,2-bdc)]n (1), [Cu(1,2-bdc)]n (2) and [Co3(OH)2(1,2-bdc)2]n (3), have been prepared and characterized. In comparison with the mononuclear Mn unit of compound 1, paddle-wheel binuclear Cu2(CO2)4 and trinuclear Co3(OH) building units are observed in 2 and 3, respectively. Also, the bdc2− ligands adopt different coordination modes in the three compounds. The resulting two frustrated lattices have been observed, such as the triangular lattice for 2 and the Kagomé lattice for 3, and thus, both complexes 2 and 3 show spin frustrated antiferromagnetic properties. In addition, the magnetic hysteresis loops reveal the existence of the long range ordering in 2 and 3. Comparatively, the magnetic measurements indicate that compound 1 exhibits a weak antiferromagnetic interaction, and the fit of the variable-temperature magnetic susceptibility data to the empirical equation leads to the following parameters: J = −0.80(1) cm−1 and g = 2.02.

Based on the organic ligand 2,4-diamine-6-phenyl-1,3,5-triazine (Phdat), two Ag(I) compounds, Ag(Phdat)2(NO3) (I) and Ag(Phdat)2(OAc) (II), have been synthesized and characterized by single crystal X-ray diffractions, elemental analyses, and IR spectra. Compounds I and II are mononuclear and binuclear structures, respectively, and with the help of N-H…O and N-H…N hydrogen bonds and π…π packing interactions, the 3D supramolecular networks are built up.

A novel bilayer metal–organic framework is assembled with a perfect intralayer triangular subnet and ideal interlayer Td arrangement between unprecedented crown-like Co7 cluster units, exhibiting high spin frustration.