Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 3, Pages 960-964Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201508065
Keywords
cluster compounds; heterometallic complexes; ligand design; programmed synthesis; site-selective synthesis
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Funding
- Sumitomo Foundation (S.A.)
- Kanazawa University CHOZEN project
- Ministry of Education, Culture, Sports, Sciences and Technology, Japan
- Grants-in-Aid for Scientific Research [15K13638, 15H00723, 15H00914, 26288022] Funding Source: KAKEN
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In general, it is difficult to selectively introduce different metal ions at specific positions of a cluster-like structure. This is mainly due to statistical problems as well as the reversibility of the formation of coordination bonds. To overcome this statistical problem, we used a carefully designed ligand, H6L, which can accommodate three different kinds of metal ions in three types of coordination sites. The complex [LNiZn2La](3+), which contains three different metals, was quantitatively obtained by a stepwise procedure, but different products were obtained when the metal ions were added in a different order. However, equilibration studies indicated that this complex was almost solely formed among 54 (=3x3x(3)H(2)) possible products upon heating; the formation efficiency (ca. 100%) was significantly higher than the statistical probability (2.47%). Such carefully designed ligands should be useful for the synthesis multimetallic systems, which are of interest because of the interplay between the different metals.
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