Molecules or ions that bind to a central metal atom or ion in coordination compounds, or molecules that bind to proteins to form complexes.
From Latin 'ligare' meaning to bind or tie, plus the suffix '-and' indicating something that performs an action. Coined in chemistry during the early 20th century as coordination chemistry developed and scientists needed terms for binding relationships.
Ligands are molecular matchmakers, creating stable relationships between different chemical species. The term beautifully captures the binding nature of these interactions - from the same Latin root that gives us 'ligament' and 'religion' (things that bind together).
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