Synthesis and Crystal Structure of {Cd2}, {Cd2} and {Zn2} Complexes with Pentafluorobenzoic Acid Anions and Acetonitrile

Methods for the synthesis were developed and new homo- and heterometallic cadmium ([Eu 2 Cd 2 (MeCN) 4 (C 6 F 5 COO) 10 ] ( I ), [Tb 2 Cd 2 (MeCN) 6 (C 6 F 5 COO) 10 ]·4MeCN ( II )) and zinc ([Zn(H 2 O)(C 6 F 5 COO) 2 ] ( III ), [Eu 2 Zn 2 (MeCN) 4 (C 6 F 5 COO) 10 ] ( IV )) complexes were characterized. These complexes can be used as precursors for the synthesis of compounds with N - donor ligands. Complexes I and II differ in the coordination of the MeCN molecule, which is coordinated in II by each Tb 3+ ion. Also, additional coordination of MeCN induces a greater distortion of the {Tb 2 Cd 2 } metal core of II . The crystal packing in I – IV is stabilized by numerous intermolecular O…H, F…F, C–H…F, and C–H…O contacts. The new compounds were characterized by single crystal X-ray diffraction (CCDC no. 2076524 ( I ), 2082731 ( II ), 2082803 ( III ), 2076525 ( IV )), IR spectroscopy, C,H,N elemental analysis, and powder X-ray diffraction.