Rhodium(I) Complexes of 8-Methyl-, 8-Ethyl-, and 8-Isopropyl-quinolines and Realated 2-Substituted Derivatives

DOI: 10.1039/DT9800001259

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 1259 - 1264 (1980)

Update date:2022-08-05

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Authors:

Deeming, Antony J.

Rothwell, Ian P.

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Article abstract of DOI:10.1039/DT9800001259

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.

Full text of DOI:10.1039/DT9800001259

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