Synthesis, structure and chemistry of a twisted olefinic bis-didentate proligand: 5,5 '-bi-5H-cyclopenta[2,1-b : 3,4-b ']dipyridinylidene

Riklin, M. and von Zelewsky, A. and Bashall, A. and McPartlin, M. and Baysal, A. and Connor, J.A. and Wallis, J.D. (1999) Synthesis, structure and chemistry of a twisted olefinic bis-didentate proligand: 5,5 '-bi-5H-cyclopenta[2,1-b : 3,4-b ']dipyridinylidene. Helvetica Chimica Acta, 82 (10). pp. 1666-1680. ISSN 0018-019X. (The full text of this publication is not available from this repository)

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http://dx.doi.org/10.1002/(SICI)1522-2675(19991006...

Abstract

The elusive chiral twisted alkene, 5,5'-bi-5H-cyclopenta[2.1-b : 3,4-b']dipyridinylidene, known also as 9,9'-bi-4,5-diazafluorenylidene (BDAF), has been prepared in racemic form from 9-bromo-4,5-diazafluorene and from 9,9'-bi-4,5-diazafluorenyl and fully characterised. X-Ray measurements show that there is a twist of 37.8 degrees about the double bond between the 4,5-diazafluorenylidene units. A 1:1 charge-transfer compound with 7,7,8,8-tetracyanoquinodimethane (TCNQ) contains an unusual packing arrangement which is centred around the formation of spiral stacks. Each BDAF molecule contributes one 4,5-diazofluorenylidene unit to the backbone of the stack, while the second half is involved in hydrogen-bonding interactions and additional stacking with TCNQ. Examples of complexes containing the axially symmetric tetradentate ligand binding to one and to two metal ions. [M(bdaf)Cl-2] and [(MCl2)(2)(bdaf)] (M = Co, Ni, Zn), are reported.

Item Type: Article
Subjects: Q Science
Q Science > QD Chemistry
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: F.D. Zabet
Date Deposited: 15 Apr 2009 16:21
Last Modified: 03 Jun 2009 10:50
Resource URI: http://kar.kent.ac.uk/id/eprint/16552 (The current URI for this page, for reference purposes)
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