Complexes of functionalised phosphine ligands. Part 1. Complexes of Fe<sup>III</sup>, Co<sup>III</sup>, Ni<sup>II</sup>and Re<sup>V</sup>with tridentate Schiff bases having PNO, NNO and NNS donor sets. Crystal structures of 2-(Ph<sub>2</sub>PC<sub>6</sub>H<sub>4</sub>NCH)C<sub>6</sub>H<sub>4</sub>OH and [Co{2-(Ph<sub>2</sub>PC<sub>6</sub>H<sub>4</sub>CHN)C<sub>6</sub>H<sub>4</sub>O}<sub>2</sub>][PF<sub>6</sub>]
作者:Jonathan R. Dilworth、Stuart D. Howe、Antony J. Hutson、John R. Miller、Jack Silver、Russell M. Thompson、Mary Harman、Michael B. Hursthouse
DOI:10.1039/dt9940003553
日期:——
The Schiff bases 2-[Ph(2)P(CH2)(n)N=CH] C6H4OH (n = 3, HL(1) or 2 HL(2)), 2-(RCH=N)C6H3(OH)X-4 (R = 2-Ph(2)PC(6)H(4), X = H HL(3); R = 2-C5H4N, X = H HL(4); R = 2-C5H4N. X = Cl HL(5)) were synthesised from the appropriate amine and aldehyde. On deprotonation these all functioned as tridentate monoanionic ligands to give complexes [FeL(2)](+) and [CoL(2)]+ with Fe-III and Co-III and neutral complexes of stoichiometry NiL(2) with Ni-II. The iron complexes were examined by Mossbauer spectroscopy which indicated the presence of two iron sites in [FeL(2)(1)](+) with a spin-state equilibrium dependent on both temperature and the counter ion. The complex [FeL(2)(3)](+) showed a single iron site, again with a spin state dependent on counter ion and temperature. The crystal structures of HL(3) and [CoL(2)(3)](+) have been determined. The distortions in free HL(3) predispose it for co-ordination in a fac geometry to the Co with cis-PPh(2) groups, and the changes occurring on co-ordination are discussed in detail. Reaction of RCHO (R = 2-Ph(2)PC(6)H(4) or 2-C5H4N) with 2-aminobenzenethiol gave stable thiazoles RCHNHC(6)H(4)S-2 which did not ring open to give tridentate ligands even on reaction with base and/or metal ions.
Fahmi, Nighat; Singh, R.V., Phosphorus, Sulfur and Silicon and the Related Elements, 1995, vol. 104, # 14, p. 53 - 62
作者:Fahmi, Nighat、Singh, R.V.
DOI:——
日期:——
Bag, Saswati P.; Mukherjee, Jaya; Siladitya, Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1998, vol. 37, # 2, p. 185 - 187