ORGANOMETALLIC FLUORIDES OF ZIRCONIUM AND HAFNIUM IN THE SYNTHESIS OFCARBOXYLATE COMPLEXES - MOLECULAR-STRUCTURES OF [((ETA(5)-C(5)ME(5))ZRF(OCOCF3)(2))(2)] AND [(ETA(5)-C(5)ME(5))(2)ZR(OCOCF3)(2)]

The reaction of [(eta(5)-C(5)Me(5))ZrF3] and [(eta(5)-C(5)Me(5))HfF3] With Me(3)SiOCOCF(3) yields the dinuclear complexes [{(eta(5)-C(5)Me(5 ))ZrF(OCOCF3)(2)}(2)] (1) and [{(eta(5)-C(5)Me(5))HfF(OCOCF3)(2)}(2)] (2), regardless of the molar ratio employed. [(eta(5)-C(5)Me(5))(2)ZrF 2] reacts with 1 and 2 equiv of Me(3)SiOCOCF(3) to form the mononuclea r compounds [(eta(5)-C(5)Me(5))(2)-Zr(OCOCF3)(2)] (3) and [(eta(5)-C(5 )Me(5))2ZrF(OCOCF3)] (4), respectively. The molecular structures of 1 and 3 have been determined by single-crystal X-ray analysis: 1, tricli nic, <P(1)over bar>, a = 9.508(3) Angstrom b = 11.002(4) Angstrom, c = 17.528(3) Angstrom, alpha = 78.55(4), beta = 76.80(2), gamma = 87.51( 2)degrees, V = 1750(1) Angstrom(3), Z = 2, R = 0.0378; 3, monoclinic, C2/c, a = 18.553(4) A, b = 9.110(2) Angstrom, c = 16.323(3) Angstrom, beta = 114.88(3)degrees, V = 2503(1) Angstrom(3), Z = 4, R = 0.0457. C ompound 1 shows bridging bidentate and chelating carboxylate ligands a s well as bridging fluorine atoms. The zirconium atoms are seven coord inated and have an 18-electron configuration. X-ray studies of 3 revea l two structural components where the carboxylate Ligands coordinate i n a monodentate (major component) and a chelating manner (minor compon ent).