A number of metal centres grouped close together which can have direct metal bonding interactions or interactions through a @B00741@, but are not necessarily held together by these interactions.
Source: PAC, 1997, 69, 1251. (Glossary of terms used in bioinorganic chemistry (IUPAC Recommendations 1997)) on page 1265 [Terms] [Paper]
Citation: 'cluster' in IUPAC Compendium of Chemical Terminology, 3rd ed. International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. https://doi.org/10.1351/goldbook.CT06769 RISBibTexEndNote