219563-85-6Relevant articles and documents
Isomeric preference in complexes of palladium(II) with chelating P,n-donor ligands
Del Campo, Olga,Carbayo, Arancha,Cuevas, Jose V.,Gabriel, Garcia-Herbosa,Munoz, Asuncion
experimental part, p. 2254 - 2260 (2009/12/02)
Square-planar complexes [PdCl{K2-(RN = CHC6H 4PPh2)Rj] (R = Cl; R = 4-CH 3C6H4, 1a; R = 2-CH3OC 6H4, 1b;R = 2- HOC6H4, 1c;R' =CH3; R = 4-CH3C6H4, 2a;R = 2-CH3OC6H4, 2b; R = 2-HOC6H 4, 2c) have been prepared and characterized. In complexes 2a-c only formation of one isomer was observed. The Pd-methyl bond arranges in a cis position to the phosphane fragment of the P,N chelating ligand. Reaction of complexes 2a-c in acetonitrile with AgBF4 led to removal of the chlorido ligand and coordination of acetonitrile for 2a. However, for 2b and 2c coordination of the oxygen was observed and the chelating P,N ligands became tricoord- inate. DFT calculations developed on models of the complexes displayed that the isomer with the methyl ligand coordinated in the cis position to the phosphane ligand were harder (or had a bigger HOMO/LUMO gap). Wiley-VCH Verlag GmbH & Co. KGaA.
Complexes of Functionalised Phosphine Ligands. Part 1. Complexes of Fe(III), Co(III), Ni(II) and Re(V) with Tridentate Schiff Bases having PNO, NNO and NNS Donor Sets. Crystal Structures of 2-(Ph2PC6H4N=CH)C6H4OH and 2>
Dilworth, Jonathan R.,Howe, Stuart D.,Hutson, Antony J.,Miller, John R.,Silver, Jack,et al.
, p. 3553 - 3562 (2007/10/02)
The Schiff bases 2-C6H4OH (n = 3, HL1 or 2 HL2), 2-(RCH=N)C6H3(OH)X-4 (R = 2-Ph2PC6H4, X = H HL3; R = 2-C5H4N, X = H HL4; R = 2-C5H4N, X = Cl HL5) were synthesised from the appropriate amine and aldehyde.On deprotonation these all functioned as tridentate monoanionic ligands to give complexes (1+) and (1+) with Fe(III) and Co(III) and neutral complexes of stoichiometry NiL2 with Ni(II).The iron complexes were examined by Moessbauer spectroscopy which indicated the presence of two iron sites in 12>(1+) with a spin-state equilibrium dependent on both temperature and the counter ion.The complex 32>(1+) showed a single iron site, again with a spin state dependent on counter ion and temperature.The crystal structures of HL3 and 32>(1+) have been determined.The distortions in free HL3 predispose it for co-ordination in a fac geometry to the Co with cis-PPh2 groups, and the changes occurring on co-ordination are discussed in detail.Reaction of RCHO (R = 2-Ph2PC6H4 or 2-C5H4N) with 2-aminobenzenethiol gave stable thiazoles which did not ring open to give tridentate ligands even on reaction with base and/or metal ions.
