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Checking the Route to Cluster Helicates
Author(s) -
Bermejo Manuel R.,
GonzálezNoya Ana M.,
MartínezCalvo Miguel,
Pedrido Rosa,
Romero María J.,
Vázquez López Miguel
Publication year - 2008
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200800477
Subject(s) - chemistry , cluster (spacecraft) , semicarbazone , stoichiometry , stereochemistry , schiff base , crystallography , crystal structure , organic chemistry , computer science , programming language
The aim of the work described here was to test the general applicability of our recently reported route to cluster helicates and to carry out a systematic study to relate the structural and coordinative properties of the organic strands with the microarchitectures of the resulting cluster helicates. Nine new Zn II , Cu I and Ag I complexes were prepared from three Schiff base ligands [H 2 L a : bis(4‐methyl‐3‐thiosemicarbazone)‐2,6‐diacetylpyridine; H 2 L b : bis(4‐methyl‐3‐thiosemicarbazone)‐2,6‐diacetylbenzene; H 2 L c : bis(4‐ethyl‐3‐thiosemicarbazone)‐2,6‐diacetylbenzene]. The experimental data confirm that Ag I and Cu I tetranuclear cluster helicates were obtained with a [M 4 (L x ) 2 ] stoichiometry, and this finding demonstrates the general applicability of the synthetic route. The cluster helicates presented in this work were characterized for the first time in solution by NMR spectroscopy. In addition, six of the nine complexes were characterized by X‐ray diffraction studies, and three of them were found to be tetranuclear cluster helicates. A detailed study of these three crystal structures leads us to state that the changes introduced in the organic strands do not prevent the assembly of the tetranuclear cluster dihelicates, but they do affect the microarchitectures. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)