Two compounds with 3-methylbenzoic acid(HL) [Co(L)2(4,4'-bipy)]n 1 and [Zn2(L)4(4,4'-bipy)]n 2(L = 3-methylbenzoic acid) have been hydrothermally synthesized directly and characterized by single-crystal X-ray diffraction analysis,elemental analyses,IR spectra and ultraviolet-visible diffuse reflection integral spectra(UV-Vis DRIS).The two compounds are both one-dimensional infinite chains.The structural difference is that 1 is a double-chain structure and 2 is only a single chain one.At the same time,the carboxylate groups adopt different modes in the two compounds,relatively.Additionally,in order to explore the structural characteristic,two-dimen-sional IR spectra are investigated for 1 and 2.Photo-luminescent property of 2 is also researched in detail.
Two coordination compounds with a flexible ligand N,N?-diacetic acid imidazolium(HDAM),{[Co(trans-DAM)(bipy)(H2O)2](OH)·4H2O}n 1 and {[Cd(trans-DAM)(bipy)(H2O)](NO3)?2H2O}n 2(bipy = 4,4'-bipyridine),were prepared and characterized by single-crystal X-ray diffraction.Compound 1 crystallizes in monoclinic,space group P2/n with a = 7.589(6),b = 11.444(2),c = 12.894(3),β = 90.99(3)°,V = 1119.8(4)3,Z = 4,C8.5H14N2O5.5Co0.5,Mr = 261.68,Dc = 1.552 g/cm3,F(000) = 546,μ = 0.832 mm-1,the final R = 0.0657 and wR = 0.1958.Compound 2 crystallizes in the monoclinic C2 space group with a = 17.479(4),b = 11.689(2),c = 11.670(2),β = 117.13(3)°,V = 2121.9(7)3,Z = 4,C17H21N5O10Cd,Mr = 567.79,Dc = 1.777 g/cm3,F(000) = 1144,μ = 1.096 mm-1,the final R = 0.0233 and wR = 0.0638.In 1,the Co(II) ions are linked by μ2-trans-DAM-and bipy ligands to build a 2D(4,4) rectangular grid layer,exhibiting a 4-connected sql net.As for 2,μ3-trans-DAM-and bipy bridge Cd(II) ions form a 2D double-layer,consisting of a couple of(4,4) grid layers,which can be viewed as a(3,4)-connected network.In both compounds,the 2D structures are stabilized by hydrogen bonding interactions to give 3D supramolecular frameworks.Additionally,FT-IR spectroscopy,UV-Visible spectroscopy,and the fluorescent properties are discussed.
Two novel transition metal phosphonate compounds,[Co(H2BDPP)(phen)]n 1 (BDPP = p-O3PCH2(C6H4)CH2PO3,phen = 1,10-phenanthroline) and [Pb3(BCP)2]n 2 (BCP = OOC(C6H4)CH2PO3),have been synthesized and structurally determined by X-ray single-crystal diffraction. Compound 1 crystallizes in the monoclinic system,space group C2/c with a = 21.169(4),b = 12.001(2),c = 7.6211(15) ,β = 98.03(3)o,V = 1917.2(6) 3,C20H18N2O6P2Co,Mr = 505.22,Z = 8,Dc = 1.737 g/cm3,μ = 1.107 mm-1,F(000) = 1020,the final R = 0.0450 and wR = 0.1306 for 2072 observed reflections (Ⅰ > 2σ(Ⅰ)). Compound 2 crystallizes in the monoclinic system,space group C2/c with a = 4.7167(9),b = 18.753(2),c = 22.781(3) ,β = 91.07(3)o,V = 2014.7(14) 3,C8H6O5PPb1.5,Mr = 523.88,Z = 8,Dc = 3.454 g/cm3,μ = 25.222 mm-1,F(000) = 1856,the final R = 0.0441 and wR = 0.1906 for 2259 observed reflections (Ⅰ > 2σ(Ⅰ)). In compound 1,the 1D chain running along the c axis is bridged by four ligands (trans-HO3PCH2C6H4CH2PO3H) in four different directions to extend the structure into a threedimensional network. In compound 2,the Pb(Ⅱ) displays 4-and 5-coordination modes. There is a one-dimensional P-O-Pb band along the a axis formed by PO3 groups and Pb(Ⅱ) cations. These bands are joined by μ2-O of-COO to yield two-dimensional inorganic P-O-Pb layers which are pillared by the OOCC6H4CH2PO3 ligands to form a three-dimensional network. Moreover,compound 2 displays a strong emission band attributed to the ligand-centered (LC) transition.
