Affordable Access

Publisher Website

Synthesis and reactivity of binuclear 7-azaindolate complexes of iridium:I. Characterization of isomers by H,H-COSY NMR spectroscopy

Authors
Journal
Journal of Organometallic Chemistry
0022-328X
Publisher
Elsevier
Publication Date
Volume
445
Identifiers
DOI: 10.1016/0022-328x(93)80215-w

Abstract

Abstract A high-scale synthesis of pure [{Ir(μ-aza)(cod)}21 ( 1) [aza = 7-azaindolate (1 H-pyrrolo[2,3- b]pyridinate), cod = 1,5-cyclooctadiene] is described. This complex reacts with iodine to give [Ir(aza)I 2(cod)] and with carbon monoxide to afford the highly oxygen sensitive complex [{Ir(μ-aza)(CO) 2} 2] ( 2). Complexes 1 and 2 exist in solution as a mixture of the non-interconvertible head-to-head (HH) and head-to-tail (HT) isomers arising from the relative disposition of the bridging ligands. This lack of interconversion contrasts with other binuclear complexes with unsymmetrical bridging ligands. Detailed NMR studies of the isomers of the diolefin complex 1 allow the assignment of the olefinic proton and carbon resonances of the main component, the HT isomer, and their H,H-COSY spectrum allows a clear-cut distinction to be made between each isomer.

There are no comments yet on this publication. Be the first to share your thoughts.