Structural and mass spectral studies on some multiply bonded diosmium tetracarboxylate compounds

Abstract

The compounds Os₂(O₂CCH₃)₄Cl₂,1 and Os(O₂CC₂H₅)₄Cl₂, 2, have been structurally characterized. Both compounds crystallize in space group P21/n. For 1 the unit cell parameters are A = 6.546(1) Å, B = 8.950(1) Å, C = 12.533(1) Å, β = 90.17(1)° and Z = 2; for 2 they are A = 6.792(2) Å, B = 10.519(3) Å, C = 13.372(4) Å, β = 89.27(3)° and Z = 2. Both molecules have approximate D_4th symmetry with important dimensions as follows: for 1, Os=Os 2.314(1) Å, Os---Cl 2.448(2) A; for 2, Os=Os 2.316(2) Å, Os---Cl 2.430(5) Å. The mass spectra of these compounds as well as that of Os₂(O₂CC₃H₇)₄Cl₂,3, are reported and discussed.