Complexes of iron(II), nickel(II), and tin(IV) chlorides with hydrazine derivatives

Coordination mode of 4-pyridinecarbaldehyde phenylhydrazone. Structure of dichloro(4-pyridinecarbaldehyde phenylhydrazone)(tri-n-propylphosphine)palladium(II)

“…In the hydrazones derived from aldehydes R1R2~N1--N2HR3 both iminic and aminic N atoms (N 1 and N 2) are potential donor sites (Stapfer, D'Andrea & Herber, 1972;Stapfer & D'An&,;a, 1971;Bresciani-Pahor, Calligaris, Delise, Randaccio, Maresca & Natile, 1976;Nolte & Singleton, 1974;Natile, Gasparrini, Misiti & Perego, 1977), though coordination through N 1 is generally observed. When R1 or R2 are groups bearing donor atoms the hydrazone can exhibit at least one more coordination mode.…”