Nature Reviews Chemistry, Published online: 27 November 2025; doi:10.1038/s41570-025-00781-9Unsymmetric coordination environments are prevalent in metalloenzymes. By contrast, most synthetic homogeneous catalysts rely on symmetric ligand frameworks. This Review highlights biological unsymmetric bimetallic centres along with their roles in catalysis and illustrates how intentionally incorporated unsymmetry in synthetic systems mimics nature’s strategies for achieving cooperative and complementary reactivity.

Nature Reviews Chemistry, Published online: 27 November 2025; doi:10.1038/s41570-025-00781-9Unsymmetric coordination environments are prevalent in metalloenzymes. By contrast, most synthetic homogeneous catalysts rely on symmetric ligand frameworks. This Review highlights biological unsymmetric bimetallic centres along with their roles in catalysis and illustrates how intentionally incorporated unsymmetry in synthetic systems mimics nature’s strategies for achieving cooperative and complementary reactivity.

Nature Reviews Chemistry, Published online: 27 November 2025; doi:10.1038/s41570-025-00781-9Unsymmetric coordination environments are prevalent in metalloenzymes. By contrast, most synthetic homogeneous catalysts rely on symmetric ligand frameworks. This Review highlights biological unsymmetric bimetallic centres along with their roles in catalysis and illustrates how intentionally incorporated unsymmetry in synthetic systems mimics nature’s strategies for achieving cooperative and complementary reactivity.