Issue 14, 2004

Insights into the absorption of carbon dioxide by zinc substrates: isolation and reactivity of di- and tetranuclear zinc complexes

Abstract

The heptadentate Schiff base H3L can react with zinc acetate to form the discrete dinuclear complex Zn2L(OAc)(H2O), 1·H2O. The reaction of 1·H2O with NMe4OH·5H2O both in air and under an argon stream has been investigated. On one hand, this reaction in air yields the tetranuclear complex (Zn2L)2(CO3)(H2O)6, 2·5H2O, by spontaneous absorption of adventitious carbon dioxide. This process can be reverted in an acetic acid medium, whereas the treatment of 2·5H2O with methanoic acid yields crystals of [Zn2L(HCOO)]·0.5MeCN·1.25MeOH·2H2O, 3·0.5MeCN·1.25MeOH·2H2O. On the other hand, the interaction under an argon atmosphere of 1·H2O with NMe4OH·5H2O in methanol allows the isolation of the dinuclear complex Zn2L(OMe)(H2O)4, 4·4H2O. Recrystallisations of 1·H2O, 2·5H2O and 4·4H2O, in different solvents, yielded single crystals of 1·MeCN·2.5H2O, 2·4MeOH and 4·3MeOH·H2O, respectively. The crystal structure of 2·4MeOH can be understood as resulting from an unusual asymmetric tetranuclear self-assembly from two dinuclear units, and shows three different geometries around the four zinc atoms.

Graphical abstract: Insights into the absorption of carbon dioxide by zinc substrates: isolation and reactivity of di- and tetranuclear zinc complexes

Article information

Article type
Paper
Submitted
16 Apr 2004
Accepted
25 May 2004
First published
16 Jun 2004

Dalton Trans., 2004, 2135-2141

Insights into the absorption of carbon dioxide by zinc substrates: isolation and reactivity of di- and tetranuclear zinc complexes

M. Fondo, A. M. García-Deibe, N. Ocampo, J. Sanmartín and M. R. Bermejo, Dalton Trans., 2004, 2135 DOI: 10.1039/B405744A

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