Synthesis and characterization of new oxazoline-based palladacycles with bridging or terminal imidate ligands. Crystal structures of [{Pd(μ-dibromomaleimidate)(Phox)}2], [Pd(dibromomaleimidate)(Phox)(PPh3)] and [Pd(glutarimidate)(Phox)(PPh3)] (Phox=2-(2-oxazolinyl)phenyl))
摘要:
The dinuclear hydroxo complex [{Pd(mu-OH)(Phox)}(2)] (1) (Phox = 2-(2-oxazolinyl)phenyl) reacts in a 1:2 molar ratio with several imidate ligands to yield new cyclometallated palladium complexes ({Pd(mu-NCO)(Phox)}(2)] containing asymmetric imidate -NCO- bridging units. [-NCO- = succinimidate (succ) (1), phtalimidate (phtal) (2), maleimidate (mal) (3), 2,3-dibromomaleimidate (2,3-diBrmal) (4) and glutarimidate (glut) (5)]. The reaction of these complexes with tertiary phosphines provides novel mononuclear N-bonded imidate derivatives of the general formula [Pd(imidate)(Phox)(PR3)] [R = Ph (a), 4-F-C6H4 (b) or CH2CH2CN (c)]. The new complexes were characterized by partial elemental analyses and spectroscopic methods (IR, FAB, H-1, C-13 and P-31). The single-crystal structures of compounds 4, 4a and 5a have been established. (C) 2008 Elsevier Ltd. All rights reserved.