US EPA

3104462 

Journal Article 

Tetra-nuclear copper complex having P-N-P ligand to P-O-P ligand - synthesis, structural, and mechanistic studies 

Naktode, K; Kottalanka, RK; Adimulam, H; Panda, TK 

2014 

Yes 

Journal of Coordination Chemistry
ISSN: 0095-8972
EISSN: 1029-0389 

67 

18 

3042-3053 

10.1080/00958972.2014.953071 

WOS:000342831500008 

We report the synthesis and structures of three copper(I) complexes, [Cu-4(mu(3)-Cl)(2)(mu(2)-Cl)(2){mu(2)-(2,6-Me2C6H3N(PPh2)(2))}(2)] (2), [Cu-4(mu(3)-Cl)(2)(mu(2)-Cl)(2){mu(2)-(Ph2POPPh2)}(2)] (4), and [Cu-2(mu(2)-Cl)(2)(mu(2)-PPh2OPPh2)(eta(1)-Ph2PP(=O)Ph-2)(PPh3)] (5), and one cobalt complex, [(CoCl2){mu(2)-2,6-Me2C6H3N(PPh2)(2)}(2)][CoCl3NH2(2,6-Me2Ph)] (3). Tetra-nuclear copper complex 2 was prepared in good yield by the reaction of bis(diphenylphosphino)-2,6-dimethylaniline [2,6-Me2C6H3N(PPh2)(2)] (1) with copper(I) chloride along with triphenylphosphine in methanol. Adding a calculated amount of water and dichloromethane mixture (1 : 10) to 2 produced a second tetra-nuclear copper(I) complex, 4, with a P-O-P backbone, along with a small amount of the unsymmetrical copper(I) complex 5. The cobalt complex 3 was obtained by reaction of 1 with cobalt(II) chloride. The solid-state structures of 2-5 were established by single-crystal X-ray diffraction analysis. In the solid state, both 2 and 4 form a tetra-nuclear copper core. In the P-31{H-1} NMR study, we observed the conversion of 2, with P-N-P backbone, to 4, with P-O-P backbone. 

P-P bond; P-O-P ligand; P-N-P ligand; tetra-nuclear; Copper(I)