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Why is it important?

HSAB theory does not always hold good. For example, in this paper we show that the presence of one hard ligand improves the stability. Rather than having all sulfur or all phosphorus ligands, copper(I) prefers to have at least one N or one O ligand!

Perspectives

The net charge on copper(I) complexes makes it harder or softer. If a complex has a net + charge, the cation is harder. If it is neutral, or negatively charged, the metal becomes soft!!

Professor Ashoka G Samuelson
Indian Institute of Science

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This page is a summary of: Is copper(i) hard or soft? A density functional study of mixed ligand complexes, New Journal of Chemistry, January 2007, Royal Society of Chemistry,
DOI: 10.1039/b618494b.
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