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Synthesis and Structural Characterization of the {[Rh<sub>5</sub>(CO)<sub>14</sub>]−(H<sub>2</sub>N(CH<sub>2</sub>)<sub>4</sub>NH<sub>2</sub>)−[Rh<sub>5</sub>(CO)<sub>14</sub>])}<sup>2-</sup> and [Rh<sub>5</sub>(CO)<sub>13</sub>(H<sub>2</sub>N(CH<sub>2</sub>)<sub>2</sub>NH<sub>2</sub>)]<sup>-</sup> Anions (as [PPh<sub>4</sub>]<sup>+</sup> Salts): An Unprecedented Example of Carbonyl Substitution by Alkylamines in a Homoleptic Metal Carbonyl Cluster Anion

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NIAID Data Ecosystem2026-03-06 收录
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The substitution of one or two carbonyls by many different primary and secondary alkylamines and -diamines has been established for the first time in a homoleptic carbonyl cluster anion, the trigonal bipyramidal [Rh5(CO)15]-. Two derivatives, the bis-monosubstituted {[Rh5(CO)14]−(H2N(CH2)4NH2)−[Rh5(CO)14]}2- dianion (1) and the disubstituted chelated [Rh5(CO)13(H2N(CH2)2NH2)]- monoanion (2), have been structurally characterized, both in the solid state (as [PPh4]+ salts) and in solution, revealing that the sites of the substitution are the cluster apexes. 13C NMR spectra of 2 revealed localized fluxionality of the CO ligands over the temperature range 298−183 K.

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2016-08-17
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