Triruthenium and triosmium carbonyl cluster complexes containing bridging ligands derived from 2-amino-7,8-benzoquinoline

摘要

The ruthenium cluster complexes [Ru-3(mu(3)-eta(3)-abq-C,N,N)(CO)(9)] (1) and [Ru-3(mu-H)(2)(mu(3)-eta(3)-abq-C,N,N)(2)(CO)(6)] (2) (H(2)abq = 2-amino-7,8-benzoquinoline) have been stepwise prepared from [Ru-3(CO)(10)(MeCN)(2)]. Both compounds contain cyclometalated abq ligands which span a Ru-Ru edge through the N atom of an amido fragment and chelate the remaining Ru atom through both the quinolinic N atom and the C atom of the cyclometalated ring. For steric reasons, the cyclometalation is responsible for the observation of short Ru-N-amido bond lengths. The reaction of the osmium cluster [Os-3(CO)(10)(MeCN)(2)] with H(2)abq gives the amido-bridged decacarbonyl derivative [Os-3(mu-H)(mu-eta(1)-Habq-N)(CO)(10)] (3). Curiously, while complex 3 is stable in refluxing toluene, the ruthenium analogue of 3 has. not been detected. Compounds 1-3 represent the first trinuclear carbonyl clusters containing ligands derived from 2-amino-7,8-benzoquinoline. [References: 42]