Monodentate S-vs. bidentate 1,5-O,S-coordination of N-phosphoryl-N′-(R)-thioureas with Pd(II)
                                
                                    
                                        作者:Damir A. Safin、Felix D. Sokolov、Łukasz Szyrwiel、Sergey V. Baranov、Maria G. Babashkina、Timur R. Gimadiev、Henryk Kozlowski                                    
                                    
                                        DOI:10.1016/j.poly.2008.03.012
                                    
                                    
                                        日期:2008.6
                                    
                                    Reaction of N-phosphorylated thioureas of common formula RNHC(S)NHP(O)(OiPr)(2) (R = rBu, HL1:R = Ph, HLII; R = 4'-benzo- I 5-crown-5, HLIII) with Pd(PhCN)(2)Cl-2 in acetonitrile leads to complexes of the structure Pd(HL1-S)(2)Cl-2 (1), Pd(HLII-S)(2)Cl-2 (2) and Pd(HLIII-S)(2)Cl-2 (3). Reaction of N-phosphorylated thioureas of common formula RC(S)NHP(O)(OiPr)(2) (R = Et2N, HLIV; R = morpholine-N-yl, HLV) in the same conditions leads to complexes Pd(L-IV-O,S)(2) (4) and Pd(L-V-O,S)(2) (5), where the palladium(II) atoms are coordinated in a square-planar fashion by the C=S sulfur atoms and the P=O oxygen atoms of two anionic ligands. The crystal structure of complex I has been investigated by X-ray crystallography. It was established that the thiourea ligands are in a trans-configuration and the palladium(II) cation is coordinated by the sulfur atoms of the C=S groups and the chlorine atoms. Complex 1 is the first example of palladium(II) complex in which the potentially chelating N-phosphorylated thiourea ligand is bound through the sulfur atom only. (C) 2008 Elsevier Ltd. All rights reserved.