An organic coordination (complexing) compound in which the metal ion is bound to atoms of nonmetals, e. g. nitrogen, carbon, or oxygen, to form a heterocyclic ring having coordinate covalent bonds.
一种配位(络合)化合物，其中的金属离子与氮、碳或氧等非金属原子结合生成有配位共价键的杂环。
2
E. g. "the spectrum of pyridine coordinately bonded to the surface is markedly different from that of the pyridinium ion".
例如：吡啶的光谱与表面的协调度和吡啶离子有显著不同。
3
Precious metals: hydroxide precipitation and sedimentation plus precious metal recovery, e. g. evaporation, ion exchange, etc.