Synthesis and Characterization of Dimolybdenum(II) Complexes Connected by Carboxylate Linkers

The dinuclear complex cis-[(CH3CN)6Mo2(O2C-Fc)2(BF4)2] (2) and the square-shaped compound [(CH3CN)4Mo2(O2C-Fc-CO2)­(BF4)2]4 (3) can be synthesized by reacting [Mo2(NCCH3)10]­[BF4]4 (1) with the corresponding ferrocenemonocarboxylic and -dicarboxylic acids (FMCA and FDCA) in a mixture of CH3CN and THF. The reaction of [Mo2(NCCH3)10] [BF4]4 (1) with tetrafluoroterephthalic acid in propionitrile solution affords the square-shaped complex [(CH3CH2CN)4Mo2(O2C-C6F4-CO2)­(BF4)2]4 (4). The interaction of 1 with 5-fluoroisophthalic acid using acetonitrile as solvent results in the isolation of the triangular complex [(CH3CN)6Mo2(m-bdc-F)(BF4)2]3 (5). The products 2–5 have been characterized by single-crystal X-ray diffraction, NMR spectroscopy (1H, 11B, 13C, 19F), IR spectroscopy, elemental analysis, TG-MS, and UV–vis spectroscopy measurements.