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。
Diacetato[(S)-(-)-2,2'-bis(di-p-tolylphosphino)-1,1'-binaphthyl]ruthenium(II)
Diacetato{(S)-(-)-2,2'-bis[di(3,5-xylyl)phosphino]-1,1'-binaphthyl}ruthenium(II)
Chloro(1,5-hexadiene)rhodium(I),dimer
Di-μ-chlorobis[2-[(dimethylamino)methyl]phenyl-C,N]dipalladium(II)
Chloro(2'-amino-1,1'-biphenyl-2-yl)palladium(II) dimer
Acetylacetonatobis(ethylene)rhodium(I)
Dichlorotricarbonyl ruthenium(II) dimer
(Hexamethylbenzene)ruthenium(II) dichloride dimer
Tetrakis[n-tetrachlorophthaloyl-(s)-tert-leucinato]dirhodium bis(ethyl acetate) adduct
(2Sp)-1-[(1R)-1-(Dicyclohexylphosphino)ethyl]-2-(diphenylphosphino)ferrocene
Tetrakis[N-phthaloyl-(S)-phenylalaninato]dirhodium ethyl acetate adduct
Allylpalladium(II) chloride
[1,3-Bis(2,4,6-trimethylphenyl)imidazolidin-2-ylidene]-dichloro-[(5-nitro-2-propan-2-yloxyphenyl)methylidene]ruthenium
(R)-Ru(OAc)2(DM-BINAP)
Nickel(II) fluoride
Nickel iodide (NiI2)
Nickel(Ⅱ) acetate tetrahydrate
Nickel(II) hydroxide
Aminoferrocene
Ruthenium(III) chloride xhydrate
Palladium bromide
Palladium(II) 2,2,2-trifluoroacetate
Dichloro(benzene)ruthenium(II) dimer
Trichloro(pentamethylcyclopentadienyl)titanium(IV)
Benzoylferrocene
[1,1'-Bis(diphenylphosphino)ferrocene]dichloronickel(II)
