A Novel Coordination Polymer,[AgI4 (bpdc)(H2bpdc)(Hbpdc)2]n(bpdc=2,2'-bipyridyl-3,3'-dicarboxylate):Coordination Models of bpdc Ligands

• 来源期刊: 中国化学（英文版）
• 年，卷（期）: 2004,（8）
• 页码范围: 816-821
• 页数: 6页
• 语种: 英文

摘要

A novel coordination polymer, [Ag4(bpdc)(H2bpdc)(Hbpdc)2]n (bpdc=2,2′-bipyridyl-3,3′-dicarboxylate), was hydrothermally synthesized at 403 K and structurally characterized by single crystal X-ray diffraction analysis. The compound crystalizes in the monoclinic space group C2/c with a= 1.9516(4) nm, b= 1.9503(4) nm, c= 1.2566(3)nm, and β= 112.48(3)°. In the two-dimensional crystal structure, AgI center is coordinated, in a scarce coordination environment, double-capped tetrahedron, by one bpdc ligand to form N-Ag-N chelate bond via two pyridyl N atoms, and other two bpdc ligands to form two O-Ag-O chelate bonds, respectively, via two carboxyl O atoms.The bpdc ligands are present in one non-protonated form, bpdc, and two protonated forms, Hbpdc and H2bpdc,which all act as μ3-1igand in a hexadentate fashion (N, N′; O, O′; O, O′) to coordinate with three Ag centers, respectively, through the three chelate bonds. This coordinated fashion of bpdc ligand is first found in the title compound.UV-Vis-NIR reflectance spectroscopy study revealed insulator nature for the crystal with an optical energy gap of 3.1 eV.