A bridging ligand attaches to two or more metal centers. The symbol records bridging; its electron donation must be apportioned consistently between the metals in electron counting.
A pair of metal centres connected through one or more thiolate sulfur donors. A diamond can coexist with a direct metal–metal bond; each bridging thiolate supplies a donor interaction at both metals.
A ligand interacting with the vertices of a cluster face. In an Mo6Cl8 core, each inner chloride caps a triangular face of the metal octahedron.
An alkynyl-derived group connecting metal centres. Sigma attachment and alkyne pi donation can both contribute; the exact orbital distribution is not established by one averaged NMR resonance.
An alkyl group attached across metal centres. A bridging methyl can form a three-centre two-electron bond, rather than two full independent two-electron metal–carbon bonds.
A chloride-derived ligand connecting more than one centre. chlorine lone-pair donation permits a different electron count from an electron-deficient alkyl bridge.
A coordination chain in which halide ligands connect successive metal sites. Asymmetric short and long metal–halide contacts can accompany mixed valence.
A bridging carbonyl ligand spans more than one metal. A conventional two-metal bridging CO contributes one electron to each metal in neutral electron counting. Its stretching band often lies below terminal-carbonyl bands because of stronger C–O weakening, but assignment should also use composition and structural evidence.
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