摘要:
Bis-bidentate tetra-coordinated oxalato bridged binuclear Schiff-base palladacycles [Pd{C,N-k(2)-(4-R) C6H3CH=NC6H3-2,6-i-Pr-2](2)(mu-eta(2)-eta(2)-C2O4) (R = H; OMe) were synthesized. Reactions of mu-oxalato bridged Schiff-base palladacycles [Pd{C,N-k(2)-(4-R)C6H3CH=NC6H3-2,6-i-Pr-2](2)(mu-eta(2)-eta(2)-C2O4) (R = H; OMe) with 1,4-bis(diphenylphosphino)butane (dppb) and 1,4-bis(diphenylphosphino)pentane (dppp) generated discrete pseudo-macrocycles with 1,1 '-bicoordinated oxalato bridge. Unexpectedly, mu-oxalato bridged Schiff-base palladacycle [Pd(C,N-k(2)-C6H4CH-NC6H3-2,6-i-Pr-2)](2)(mu-eta(2)-eta(2)-C2O4) reacted with PPh3 to form unusual bidentate/monodentate tri-coordinated oxalato bridged binuclear cyclopalladated complex [Pd(C,N-k(2)-C6H4CH=NC6H3-2,6-i-Pr-2)(PPh3)](mu-eta(2)-eta(1)-C2O4)[Pd(C-k(1)-C6H4CH=NC6H3-2,6-i-Pr-2)(PPh3)]. (C) 2014 Elsevier B.V. All rights reserved.