Sigma Bonds in Multiple-bonded Species
Compounds that feature multiple bonds, such as the dihydrogen complex, have sigma bonds between the multiple bonded atoms. These sigma bonds can be supplemented with other bonding interactions, such as by π-back donation, e.g. in the case of W(CO)3(PCy3)2(H2), and even δ-bonds, e.g. in the case of chromium(II) acetate.
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