Synthesis and characterization of a novel copper(II)-silver(I) mixed-metal coordination polymer:: Ag[Cu(2-pyrazinecarboxylate)2](H2O)(NO3)

The first example of a Cu(II)-Ag(I) mixed-metal coordination polymer, Ag[Cu(2-pyrazinecarboxylate)(2)](H2O)(NO3) (3), has been prepared via hydrothermal reaction of Cu(II)(2-pyrazinecarboxylate)(2) (1) or Cu(II)(2-pyrazinecarboxylate)(2)(H2O)(2) (2) with AgNO3 in water (130 degrees C, 24 h). Compound 3 features linear -Cu(1)-(2-pyrazinecarboxylate)-Ag-(2-pyrazinecarboxylate) Cu(2)-(2-pyrazinecarboxylate)-AG- strands cross-linked by water molecules to form a two-dimensional cationic sheet network. These cationic sheets are further joined by inter-layer Ag ... NO3-... Cu linkages to give a novel cavity-containing three-dimensional network. Compound 3 was characterized by single-crystal X-ray diffraction (triclinic, P (1) over bar; a = 6.1672(12), b = 8.3595(17), c = 14.223(3) Angstrom, alpha = 77.35(3), beta = 86.80(3), gamma = 87.70(3)degrees, V = 714.1(2) Angstrom(3), Z = 2, T= 296 K, D-calc = 2.314 g cm(-3), R-1 = 0.048, wR(2) = 0.121), thermogravimetry (DTA-TGA), IR and elemental analysis. In addition, the magnetic behavior of 3 was investigated and found to follow the Curie law (mu(eff) = 1.81 mu(B)). (C) 2000 Editions scientifiques et medicales Elsevier SAS. All rights reserved.