摘要:
Neutral iron(II) ferracarboranes of the type [closo-3-CO-3-L-3-L'-3,1,2-FeC2B9H11] (3, L = CO, L' = PPh3; 4, L = PPh3, L' = CH3CN; 5, L = CO, L' = CH3CN; 6 L = CO, L' = P(OCH3)3; 7, L = L' = P(OCH3)3; 8, L = L' = CO) have been prepared by the Cu(I) oxidation of the dimeric iron dicarbollide complex [closo-3-CO-3,3'-(mu-CO)-3,1,2-FeC2B9H11]2(2-) (2) in the presence of the designated monodentate ligands. Complexes 3, 4, 7, and 8 have been structurally characterized by single-crystal X-ray diffraction. Crystallographic parameters are as follows (compound: crystal system; space group; crystal parameters; Z; unique data (I > 3-sigma(I)); R,R(w)). 3: monoclinic; A2/a; a = 18.384 (3) angstrom, b = 12.762 (2) angstrom, c = 23.059 (3) angstrom, beta = 104.081 (4)-degrees; 8; 1780; 7.4, 8.8. 4: monoclinic; C2/a; a = 28.050 (2) angstrom, b = 11.5715 (9) angstrom, c = 19.042 (2) angstrom, beta = 116.846 (2)-degrees; 8; 1702; 6.5, 7.7. 7: orthorhombic; Pbnm (standard setting Pnma); a = 10.397 (2) angstrom, b = 14.419 (3) angstrom, c = 15.092 (3) angstrom; 4; 1051; 7.1, 8.9. 8: monoclinic; P2(1)/n; a = 6.971 (4) angstrom, b = 15.900 (9) angstrom, c = 11.237 (7) angstrom, beta = 91.42 (2)-degrees; 4; 1108; 6.2, 7.4. The closo 12-vertex icosahedral geometry comprising a polyhedral (d6Fe)C2B9 framework and the pseudooctahedral coordination exhibited by the iron atom are common structural features displayed by all four ferracarboranes.