V. Albano, P. L. Bellon
Oct 1, 1969
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0
Influential Citations
36
Citations
Journal
Journal of Organometallic Chemistry
Abstract
Abstract The crystal and molecular structure of the tetramethylammonium salt of the triacontacarbonyldodecarhodate dianion [N(CH3)4]2[Rh12(CO)30] has been determined from three-dimensional X-Ray data collected by counter methods. The structure has been refined by least squares on 1800 Fo's down to an R factor of 0.05. This salt crystallizes in the monoclinic space group P21/c (C52h) with the following cell parameters: a = 9.491(5) A, b = 17.185(7) A, c = 17.756(7) A, β = 96°57'(15'), Z = 2. The structure is composed of anionic and cationic layers. The anion is a centrosymmetric dimer of the [Rh6(CO)15]− unit. The catenation between the symmetry related sub-units takes place by a metalmetal bond and two CO groups bridged over it. The coordination pattern around the rhodium atoms is very similar to that found in the neutral molecule Rh6(CO)16 with the exception of the catenating Rh atoms which display nine-fold coordination. The overall symmetry of the anion is D2h. The metal cluster exhibits a range of RhRh distances from 2.68 A to 2.85 A. The independent CO groups fall into 3 classes: 10 are linearly bonded, 4 are triply asymmetrically bridged on alternating octahedral faces and 1 is connecting the two octahedral sub-units through a symmetric double bridge.