In this paper, one triangular pyridylcarboxylic acid ligand (HL) has been synthesized, characterized by NMR, elemental analysis and IR spectra. Reactions of HL with3d transition metal salts result in eight interesting coordination polymers, i.e.[Ni2(ox)(L)2]n·4nH2O (1),[Zn2(ox)(L)2]n·4nH2O (2),[Co2L2(ox)]n (3),[Ni2L2(HCOO)22H2O]n·nH2O (4),[Co2L2(HCOO)2·2H2O]n·nH2O (5),[Cd2(L)4]n (6),[Co2L2(bdc)·2H2O]n (7),[Zn2L2(bdc)]n (8). The structures of the above eight compounds have been determined by single-crystal x-ray diffractions. In addition, they are also characterized by PXRD, elemental analysis, IR spectra and TGA.Compound1and2are isostructure one-dimension channels along the crystallographic [001] direction. Though they are two-fold interpenetrated, they have high accessible voids (35.2%for1and35.2%for2respectively). Compound1has high stability to the moister. The isotherm gas adsorption measurements show that compound1has typical microporous structure and possesses high selectivity for Carbon dioxide, fluorescent experiments at room temperature show that compound2exhibits a cyan fluorescent emission at477nm. Compared with the emission of the HL, the spectrum of2has a large red-shift97nm, which can be assigned to the LMCT. Compound3has one-dimension Co(Ⅱ) chains along the crystallographic b axis, which are bridged by oxalic ligands and carboxylic ligands alternately. The inter-chain separation is8.16A. Compound4and compound5are also isostructural both have (3,3) grids along the direction of [101]. Adjacent layers are stabilized by the π…π interactions between the un-coordinated pyridyl rings. Compound6has (3,4,5)-connected ntework, with the Point (Schlafli) symbol{44·62·74}{6·72}{64·72}. Solid fluorescent experiments at room temperature show that compound6exhibits a cyan fluorescent emission at467nm. Compared with the emission of the HL, the spectrum of2has a large red-shift87nm, which can be assigned to the LMCT. In compound7, the two-dimension pillar layers form the final three-dimension structure through the three-fold interpenetration. Up to now, these2D+2D→3D frameworks are rarely seen. Compound8has two-dimension layers in the be plane, which have one-dimension channels along the crystallographic b axis. However, the insertion of the un-coordinated pyridyl rings from the adjacent layers into the channels results in the three-dimension supramolecule. Magnetic data analyses show that there are strong antiferromagnetic interactions in compound3,4and7. |