Reactivity of cyclometallated palladium(II) compounds derived from N-(benzylidene)xylylendiamines

New developments in the studies of the reactivity of cyclometallated palladium(II) compounds with homo- ([P,P],[As,As]) and heterobidentate ([P,N],[P,O]) ligands

“…Treatment of 1 and 2 with Ph 2 P(C 6 H 4 )CHO in a 1:2 molar ratio in the presence of NH 4 Suitable crystals were grown by slowly evaporating dichloromethane/n-hexane (7,15,21) or chloroform/n-hexane (11) solutions of the complexes. The labeling schemes for the compounds are shown in Figs.…”

“…For mononuclear complexes 11 and 15 the palladium(II) is bonded to the C1 and the nitrogen atoms of the Schiffbase ligand and to the phosphorous (11) or arsenic (15) atoms of the homobidentate chelating ligand. In compound 21 the palladium(II) is bonded to four different atoms: and ortho-carbon of the phenyl ring and a nitrogen atom of the benzylidene ligand, and the oxygen and phosphorous atoms of the 2-(diphenylphosphino)benzaldehyde forming a six-membered ring chelate.…”

“…In particular, cyclometallation of Schiff-base ligands with a wide range of transition metals has been extensively investigated. Tetradentate [C,N,C,N] Schiff bases generally undergo double metallation to give compounds with two metal atoms per organic ligand [6][7][8][9][10][11][12][13][14][15][16], however, as we have reported previously, in the case of the potentialy tetradentate ligands derived from isophthalaldehyde, 1,3-(CyN@CH) 2 C 6 H 4 , and terephthalaldehyde, 1,4-(CyN@CH) 2 conditions [17][18][19]. Thus, treatment with palladium(II) acetate in acetic acid gave the monocyclometallated complexes 1 and 2 after cleavage of one C@N double bond, and we have studied the reactivity of these cyclometallated complexes towards different mono and bidentate ligands [20][21][22][23][24].…”