过渡元素(transition elements)是元素周期表中从ⅢB族到VⅢ族的化学元素 。这些元素在原子结构上的共同特点是价电子依次充填在次外层的d 轨道上 ，因此，有时人们也把镧系元素和锕系元素包括在过渡元素之中 。另外，ⅠB族元素(铜、银、金)在形成+2和 +3 价化合物时也使用了d电子；ⅡB族元素(锌、镉、汞)在形成稳定配位化合物的能力上与传统的过渡元素相似，因此，也常把ⅠB和ⅡB族元素列入过渡元素之中。
[1,1'-Bis(diphenylphosphino)ferrocene]dichlorocobalt(II)
(SP-4-3)-Benzylbis(triphenylphosphine)palladium(II) chloride
Copper(II) phthalocyanine
Bis[rhodium(α,α,α',α'-tetramethyl-1,3-benzenedipropionic acid)]
Chlorobis(cyclooctene)iridium(I)dimer
Bis(cyclopentadienyl)ruthenium(II)
Platinum(II) acetylacetonate
Platinum(II) chloride
Bis(tri-tert-butylphosphine)palladium
(1-Hydroxyethyl)ferrocene
Bromoferrocene
Dichlorotetrakis(2-(2-pyridinyl)phenyl)diiridium(III)
(R,R)-N,N'-Bis(3,5-di-tert-butylsalicylidene)-1,2-cyclohexanediaminocobalt(II)
Rhodium(II) Octanoate Dimer
Dirhodium tetraacetate
[1,3-Bis(2,6-Diisopropylphenyl)imidazol-2-ylidene](3-chloropyridyl)palladium(II) dichloride
[1,3-Bis(2,6-diisopropylphenyl)imidazol-2-ylidene]copper chloride
Copper(I) Hexafluoro-2,4-pentanedionate 1,5-Cyclooctadiene Complex
Triruthenium dodecacarbonyl
Tris(2,4-pentanedionato)ruthenium(III)
N,N'-Ethylenebis(salicylideneiminato)cobalt(II)
1,4-Butylenebis(diphenylphosphine)palladium dichloride
Carbonylhydridotris(triphenylphosphine)rhodium(I)
Silver(I) acetate
Silver(I) benzoate
Silver(I) carbonate
Silver(I) chloride
