Novel cyclopalladated ferrocenyl Schiff base compounds with bridging and chelating diphosphines. Crystal and molecular structure of [{Pd[(eta(5)-C5H5)Fe(eta(5)-C5H3)C(H)=N-2,4,6-Me3C6H2]}-{Ph2P(CH2)(n)PPh2-P,P}][PF6] (n=1, 2)

The reaction of the ferrocenylimine (eta (5)-C5H5)Fe(eta (5)-C5H4)C(H)=NR ( R = 2,4,6-Me3C6H2) (a), with Pd(AcO)(2) or with Li-2[PdCl4] leads to the he terotetrametallic compounds [Pd {(eta (5)-C5H5)Fe(eta (5)-C5H3)C(H)=NR}(mu -O2CMe)](2) (1) and [Pd{(eta (C5H5)-C-5)Fe(eta (5)-C5H3)C(H)=NR)( mu -Cl](2 ) (2), respectively. Compound 2 may also be obtained by treatment of 1 with aqueous sodium chloride. Compound 2 reacts with tertiary diphosphines in 1 :1 or 1:2 molar ratio to give [{Pd[(eta (5)-C5H5)Fe(eta (5)- C5H3)C(H)=NR]C l)(2)} {mu -Ph2P(CH2)(n)PPh2}] (n = 1, 3; n = 2, 4; n = 3, 5; n = 4, 6), [{ Pd[(eta (5)-C5H5)Fe(eta (5)-C5H3)C(H)=NR]Cl}(2)(mu -Ph2PC5H4FeC5H4PPh2)](7) , and [Pd{(eta (5)-C5H5)Fe(eta (5)-C5H3)C(H)=NR}(Ph2P(CH2)(n)PPh2-P,P}][PF6 ] (n = 1, 8; n = 2, 9; n = 3, 10; n=4, 11), [Pd{(eta (5)-C5H5)Fe(eta (5)-C5 H3)C(H)=NR}(Ph2PC5H4FeC5H4PPh2-P,P)][PF6] (12), respectively. The crystal s tructures of compounds 8 and 9 have been determined by X-ray crystallograph y. (C) 2001 Elsevier Science B.V. All rights reserved.