75215-23-5Relevant academic research and scientific papers
Rhodium(I) Complexes of 8-Methyl-, 8-Ethyl-, and 8-Isopropyl-quinolines and Realated 2-Substituted Derivatives
Deeming, Antony J.,Rothwell, Ian P.
, p. 1259 - 1264 (2007/10/02)
The complexes have been prepared from on adding unidentate L (8-methyl-, -ethyl-, or -isopropyl-quinoline) or bidentate L (1,10-phenantroline or quinoline-2-carboxaldehide-N-methylimine). 8-Alkyl-substitution of the latter ligand gives the complexes as isomers with uni- and bi-dentate L respectively with relative stabilities of the unidentate form depending on the 8-substituent in the order Pri > Et > Me.Unidentate L is also favoured by replacing PPh3 by P(C6H11)3 but bidentate co-ordination is found using AsPh3 or PMe2Ph.Equilibrium constants for chloro-bridge cleavage of by 8-substituted and 2,8-disubstituted quinolines are reduced by increasing the size of the 8-susbtituent and even more by further introduction of a 2-methyl group.The contributions of distortions in the co-ordination to these changes in equilibrium constants are discussed.
