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。
Vinylferrocene
Chloro[1,3-Bis(2,4,6-trimethylphenyl)imidazol-2-ylidene]copper(I)
Nickel dibutyldithiocarbamate
Formylbis(triphenylphosphoranyl)rhodium(IV) chloride
1,1'-Dibenzoylferrocene
Di-μ-chlorobis[5-hydroxy-2-[1-(hydroxyimino-κN)ethyl]phenyl-κC]palladium(II) dimer
Bis(triphenylphosphine)palladium(II) dichloride
Bis(benzonitrile)palladium chloride
Tetrakis(triphenylphosphine)palladium
Bis(triphenylphosphine)nickel(II)chloride
Diacetato[(R)-(+)-2,2'-bis(diphenylphosphino)-1,1'-binaphthyl]ruthenium(II)
Ferroceneboronic acid
Bis(triphenylphosphine)palladium(II) acetate
Bis(acetonitrile)palladium(II) dichloride
1,2-Bis(diphenylphosphino)ethane nickel(II) chloride
Manganese(II) disodium 2,2',2'',2'''-(ethane-1,2-diylbis(azanetriyl))tetraacetate
Di-μ-hydroxo-bis[(N,N,N'.N'-tetramethylethylenediamine)copper(II)] chloride
Iron(III) acetylacetonate
Ferrocene
Ferrocenylacetic acid
Bis(norbornadiene)rhodium (I) tetrafluoroborate
Sliver bis(trifluoromethane sulfonimide)
Dichloro(mesitylene)ruthenium(ii) dimer
[Ir(dtbbpy)(ppy)2]PF6
1,3-Bis(diphenylphosphino)propane nickel(II)chloride
Bis(hexafluoroacetylacetonato)nickel(II)
Gold(III) oxide
Hexaamminecobalt(iii)chloride
