Issue 3, 2000

Thermodynamically controlled products: novel motif of metallohelicates stabilized by inter- and intra-helix hydrogen bonds

Abstract

Two temperature and/or time dependent self-assembly processes of maleic dianion (male), thiourea and zinc(II) or cadmium(II) ions have been studied. By prolonging the reaction time and heating, the kinetic product [{Zn(male)(tu)(H2O)}2]·4H2O 1 can be converted into the thermodynamic product [{Zn(male)(tu)2}n] 2. In the case of the Cd–maleate–tu system, the thermodynamic product with helical formation [{(male)Cd(tu)2}2(male)Cd(tu)(H2O)2]n4 was obtained from the kinetically controlled product [Cd(Hmale)2(tu)2(H2O)2] 3 by prolonging the reaction time. The thermodynamic helicate 2 bears a new metallohelicate motif in which the helical structure is induced and stabilized by interhelix hydrogen bonding. On the contrary, 4 also bears an infinite metallohelicate motif where the helix is induced and stabilized by intrahelix hydrogen bonding and a 3-D network is formed through hydrogen bonds and short S  S contacts among neighboring helixes. All the complexes were characterized by X-ray crystallography.

Supplementary files

Article information

Article type
Paper
Submitted
07 Oct 1999
Accepted
16 Nov 1999
First published
26 Jan 2000

J. Chem. Soc., Dalton Trans., 2000, 293-297

Thermodynamically controlled products: novel motif of metallohelicates stabilized by inter- and intra-helix hydrogen bonds

Y. Zhang, L. Jianmin, M. Nishiura, H. Hou, W. Deng and T. Imamoto, J. Chem. Soc., Dalton Trans., 2000, 293 DOI: 10.1039/A908070H

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