Synthesis and Single-crystal Structure of a Silver(Ⅰ) Carboxyarylphosphonate: [Ag(H_2BCP)(4,4'-bipy)]·2H_2O

The title compound, a novel Ag(Ⅰ) carboxyarylphosphonate [Ag(H2BCP)(4,4'- bipy)]·2H2O (H3BCP = p-H2O3PCH2C6H4COOH, 4,4'-bipy = 4,4'-bipyridine), was synthesized by a hydrothermal reaction and characterized by elemental analysis, IR spectra and single-crystal X-ray diffraction. It belongs to monoclinic system, space group P21/c with a = 5.7038(11), b = 22.397(4), c = 5.602(4) ?, β = 106.26(3)°, V = 1913.4(7) 3, Z = 4, C18H20N2O7PAg, Mr = 515.20, Dc = 1.788 g/cm3, μ = 1.182 mm-1, F(000) = 1040, the final R = 0.0404 and wR = 0.1216 for 4178 observed reflections with I 2σ(Ⅰ). In the structure, the Ag(Ⅰ) cations are bridged by 4,4'-bipy to give rise to 1D chains running along the b axis. These chains are linked further by the interactions of O (from BCP ligands) and Ag atoms to yield 2D layers. Hydrogen bonding interactions and weak π-π stacking interactions between 4,4'-bipy rings assemble such adjacent layers to generate a 3D supramolecular architecture.     

Two Zinc（Ⅱ） Carboxyarylphosphonates with Unusual Polynuclear Zn（Ⅱ） Units：Syntheses and Crystal Structures

[Zn2(PCP)(phen)(H2O)F]n 1 and {[Zn3(MCP)2(phen)2(H2O)]·2.5H2O}n 2(PCP = p-O2C(C6H4)PO33-,MCP = m-O2C(C6H4)PO33- and phen = phenanthroline) were obtained by hydrothermal synthesis and characterized by X-ray single-crystal diffraction.Compound 1 crystallizes in the monoclinic P21/c space group with a = 7.908(2),b = 20.254(3),c = 13.477(2) ,β = 107.76(3)°,V = 2055.7(8) 3,Z = 4,C20H16FN2O6PZn2,Mr = 561.10,Dc = 1.813 g/cm3,μ = 2.463 mm-1,F(000) = 1128,the final R = 0.0340 and wR = 0.0794.Compound 2 crystallizes in the monoclinic P21/n space group with a = 15.629(3),b = 18.141(4),c = 17.723(7) ,β = 121.89(2)°,V = 4267(2) 3,Z = 4,C40H31N4O13.5P2Zn3,Mr = 1041.70,Dc = 1.620 g/cm3,μ = 1.818 mm-1,F(000) = 2108,the final R = 0.0669 and wR = 0.1775.In compound 1,the tetranuclear Zn4 units are linked together by μ4-PCP3- to build 2D(4,4) layers,which are further interconnected through the μ2-bridging fluorion into a 3D framework with 1D phen ligands-filled channels.As for the 3D supramolecular framework of 2,the novel hexanuclear Zn6 units with "chair" conformation are extended by the moieties of μ4-MCP3- ligand to a 2D(4,4) layer on the bc plane,which is viewed as the 2-folded layers in 1.In both compounds,the structures are stabilized by hydrogen bonding interactions and π-π stacking interactions between the phen rings.Additionally,FT-IR spectroscopy and the fluorescent properties are discussed.     

Syntheses and Crystal Structures of Two Coordination Polymers Based on a Flexible Ligand N,N＇-Diacetic Acid Imidazolium

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.