Synthesis and structure of acetonitrile solvates of copper(II) monofluoroacetate and silver(I) trifluoroacetate, [Cu-2(CH2FCOO)(4) center dot 2CH3CN](CH3CN) and Ag-3(CF3COO)(3)(CH3CN)(2)

Compounds [Cu-2(CH2FCOO)(4). 2CH(3)CN](CH3CN) (I) and Ag-3(CF3COO)(3)(CH3CN )(2) (II) were synthesized and studied by X-ray structural analysis. Crysta ls I are monoclinic, space group C2/c, a 27.854(6), b = 8.286(2), c = 19.42 8(4) Angstrom, eta = 106.82(3)degrees, V = 4292(2) Angstrom (3), Z = 8, R-1 = 0.0426; crystals II are triclinic, space group P (1) over bar ,a = 8.676 (2), b = 9.819(2), c = 11.961(2) Angstrom, alpha = 95.27(3), beta = 109.59( 3)degrees, gamma = 104.60(3)degrees V = 911.4(3) Angstrom (3), Z = 2, R-1 = 0.0252. Structure I is composed of the structural units ("lanterns") typic al of copper(II) carboxylates. The presence of an additional acetonitrile m olecule noncoordinated by the copper atoms makes it possible to consider co mpound I as a lattice clathrate. Structure II has no analogs among the silv er carboxylates. It simultaneously contains silver atoms with coordination numbers varying from 2 to 4.