ISSN:
0009-2940
Keywords:
2-Pyridylalkylphosphanes
;
Hemilabile ligands
;
Nickel complexes
;
Palladium complexes
;
Platinum complexes
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Synthesis and Coordination Chemistry of Hemilabile P,N-Hybride Ligands with Terminal 2-Pyridyl Donor Groups*P,N-hybride ligands 1-7 containing terminal 2-pyridyl donor groups have been obtained by base-catalyzed addition of diphenylvinylphosphane or 2-vinylpyridine to primary or secondary phosphanes [2-Py-(CH2)2-PR′H (R′ = H, Ph), HMeP-(CH2)3-PMeH] or by alkylation of organolithium phosphides, R2P-(CH2)3-PMeLi or 2-Py-(CH2)2-PR′Li (R = Ph, iPr; R′ = H, Ph), with 2-(2-chloroethyl)pyridine or di-tert-butylphosphetanium bromide. Upon reaction with NiBr2 3 H2O or K2MCl4 (M = Pd, Pt) the phosphanes (L) of type 2-Py-(CH2)2-P(R′)-(CH2)m-PR2 (1, 3, 6) form square planar Ni(II), Pd(II), and Pt(II) complexes of composition MX2(L) (10-14). With NiBr2 and K2MX4 the tripod type phosphane 2 forms square pyramidal complexes [MX(2)]X (M = Ni, Pd; X = Cl, Br; 15, 16). An X-ray structural analysis of [NiBr(2)]+Br- (15) reveals a distorted square pyramidal coordination geometry at Ni(II), the 2-Py donor being in apical position with a long Ni—N bond [2.270(15) Å]. The tetradentate ligand 7 forms Ni(II), Pd(II), and Pt(II) complexes MX2(7) which for M = Pd, Pt show dynamic behaviour by exchange of the terminal Py donor groups. With [RhCl(COD)]2 the tridentate ligands L (1 and 3) yield complexes of composition RhCl(L) (20, 21). The structure of 20 has been determinated by X-ray diffraction. The ligand 3, acting in a tridentate manner, is coordinated to Rh(I) in a distorted square-planar arrangement with a normal Rh—N distance [2.145(3) Å].
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19941270306
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