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。
5,10,15,20-Tetraphenyl-21H,23H-porphine copper(II)
Copper(I) oxide
Cuprous thiocyanate
Copper(I) trifluoromethanesulfonate benzene complex
Copper(II) trifluoromethanesulfonate
(1,3-Bis(2,6-diisopropylphenyl)-1H-imidazol-2(3H)-ylidene)silver(III) chloride
Chloro(pyridine)bis(dimethylglyoximato)cobalt(III)
Manganese bis(trifluoromethanesulfonate)
Dichloro [(S)-(-)-2,2'-bis(diphenylphosphino)-1,1'-binaphthyl]ruthenium(II)
Copper(I) thiophene-2-carboxylate
Dichloro [(R)-(+)-2,2'-bis(diphenylphosphino)-1,1'-binaphathyl] ruthenium(II)
Ir[dF(CF3)ppy]2(dtbbpy)PF6
Iridium(1+), [4,4'-bis(1,1-dimethylethyl)-2,2'-bipyridine-κN1,κN1']bis[5-fluoro-2-(5-methyl-2-pyridinyl-κN)phenyl-κC]-, (OC-6-33)-, hexafluorophosphate(1-) (1:1)
(S)-Ru(OAc)2(BINAP)
Manganese(0) carbonyl
[Ir{dFCF3ppy}2(bpy)]PF6
Tetrakis(acetonitrile)copper trifluoromethanesulfonate
(Ferrocenylmethyl)trimethylammonium chloride
Manganese(II) Bis(trifluoromethanesulfonyl)imide
Nickel(II) bromide 2-methoxyethyl ether complex
Ruthenium-tetrakis(acetonitrile)[2-[(4S)-4,5-dihydro-4-phenyl-2-oxazolyl-κN3]phenyl-κC]-hexafluorophosphate
Palladium(2+), bis(1,2-ethanediamine-κN1,κN2)-, chloride (1:2)
Copper(II) bis(trifluoromethylsulfonyl)imide
Chloro(tetrahydrothiophene)gold(I)
[(1,2,5,6-η)-1,5-Cyclooctadiene][(2,3,5,6-η)-2,3,5,6-tetramethyl-2,5-cyclohexadiene-1,4-dione]nickel
Chlorobis(dimethylglyoximato)[4-(dimethylamino)pyridine]cobalt(III)
(OC-6-14)-[[2,3-Butanedione 2,3-di(oximato-κN)](1-)][2,3-butanedione 2,3-di(oxime-κN)]dichlorocobalt
Ni(tBustb)3
(2,2'-Bipyridyl)dichlorocopper(II)
Tricarbonyl(cyclooctatetraene)iron(II)
