Issue 22, 1997

The influence of the chelate effect on supramolecular structure formation: synthesis and crystal structures of zinc thiourea and thiosemicarbazide complexes with terephthalate

Abstract

The lability of the ligand with a potential hydrogen bond donor–hydrogen bond donor arrangement was found to be the predominant factor in determining the structures of the adducts formed between zinc(II) complexes of thiourea [tu, NH2C(S)NH2] and thiosemicarbazide [tsc, NH2C(S)NHNH2] and the terephthalate anion [tere, C6H4(CO2)2-1,4]. Reaction of [Zn(tsc)2][NO3]2, containing the bidentate thiosemicarbazide ligand, with sodium terephthalate led to a hydrogen-bonded structure, [Zn(tsc)2(OH2)2][tere]·2H2O, 1, in which the cations and anions are linked into chains through charge-augmented double hydrogen bonds between two NH protons on the tsc ligands and two oxygen lone pairs on the carboxylate. This chain formation is similar to that previously observed for related nickel complexes, although there are major differences in the way in which these chains are linked together into sheets. In contrast to the thiosemicarbazide complex, the reaction of [Zn(tu)4][NO3]2, containing unidentate thiourea ligands, with sodium terephthalate led to the formation of a co-ordinatively-bonded polymer, [Zn2(µ-tu)(tu)2(µ-tere)2]·4H2O, 2, in which the terephthalate anions have displaced some of the thiourea ligands from each zinc co-ordination sphere. The zigzag tapes formed by the terephthalate ligands bridging zinc atoms are linked together into double strands via bridging thiourea ligands.

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1997, 4237-4240

The influence of the chelate effect on supramolecular structure formation: synthesis and crystal structures of zinc thiourea and thiosemicarbazide complexes with terephthalate

A. D. Burrows, S. Menzer, D. Michael P. Mingos, A. J. P. White and D. J. Williams, J. Chem. Soc., Dalton Trans., 1997, 4237 DOI: 10.1039/A703830E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Spotlight

Advertisements