铑不同于其他铂系金属在絡合物里具有稳定的价。仅近来的实驗証明,铑和次磷酸、叔砷、二烃基(?)、烯、二烯、联吡啶、异腈等这样一些配位体可以形成其中铑为二价和一价的络合物。这些二价和一价铑的化合物不太稳定,容易被空气中的氧氧化为三价状态。我們从在分析上有时用作铂系金属的还原剂的曱酸,制得了稳定的一价铑的化合物。铑氯酸溶液和甲酸加热吋,形成暗綠色溶液,这溶 Rhodium is different from other platinum group metals in the complex has a stable price. Only recent experiments have demonstrated that such ligands as rhodium and hypophosphorous acid, tertiary arsenic, dihydrocarbyl (?), Alkene, diene, bipyridine, isonitrile and the like can form complexes in which rhodium is divalent and monovalent . These divalent and monovalent rhodium compounds are less stable and are readily oxidized to the trivalent state by oxygen in the air. We have prepared a stable monovalent rhodium compound from the formic acid which is sometimes analyzed as a reducing agent for platinum group metals. Rhodium chlorite solution and formic acid heated to form a dark green solution, which dissolved