Issue 24, 2002

Spontaneous carbon dioxide fixation: a µ4-carbonate bridged tetranuclear zinc(ii) complex of a heptadentate Schiff base

Abstract

The electrochemical reaction of zinc and 2-(2-hydroxyphenyl)-1,3-bis[4-(2-hydroxyphenyl)-3-azabut-3-enyl]-1,3-imidazolidine (H3L1) in acetonitrile in air yields the tetranuclear zinc complex [(Zn2L)2(CO3)]·4H2O, which crystallises with different solvent molecules in two different systems: [(Zn2L)2(CO3)]·4H2O·2CH3CN 1a (monoclinic, Pn) and [(Zn2L)2(CO3)]·4H2O 1b (triclinic, P[1 with combining macron]). The electrochemical reaction under a nitrogen stream leads to the isolation of crystals of [(Zn2L)2(CO3)]·0·25H2O·2CH3CN 1c (monoclinic P21/c). All structures demonstrate the striking ability of this system to spontaneously fix carbon dioxide. The crystals solution reveal a µ4211 binding mode for the carbonate group in all cases, leading to a tetranuclear complex by self-assembly of dinuclear units. Chemical reaction of Zn(CH3COO)2·2H2O with H3L yields [Zn2L(CH3COO)]·2H2O. Its recrystallisation allows isolating [Zn2L(CH3COO)]·2H2O·CH3OH 2. Reaction of [Zn2L(CH3COO)]·2H2O with (CH3)4NOH·5H2O leads, again, to the tetranuclear carbonate compound.

Graphical abstract: Spontaneous carbon dioxide fixation: a µ4-carbonate bridged tetranuclear zinc(ii) complex of a heptadentate Schiff base

Supplementary files

Article information

Article type
Paper
Submitted
23 Sep 2002
Accepted
24 Oct 2002
First published
25 Nov 2002

J. Chem. Soc., Dalton Trans., 2002, 4746-4750

Spontaneous carbon dioxide fixation: a µ4-carbonate bridged tetranuclear zinc(II) complex of a heptadentate Schiff base

M. Fondo, A. M. García-Deibe, M. R. Bermejo, J. Sanmartín and A. L. Llamas-Saiz, J. Chem. Soc., Dalton Trans., 2002, 4746 DOI: 10.1039/B209328F

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