Synthesis and characterization of copper(I) and copper(II) coordination compounds containing 4-acylpyrazolon-5-ato ligands. crystal structure of [(4-trifluoroacetyl-1-phenyl-3-methylpyrazolon-5-ato)bis (triphenylphosphine)copper(I)]

Abstract New [(Q)2CU II ] and [(Q) 2 (L)Cu II ] derivatives (in general QH is 1-R-3-methyl-4R′-pyrazol-5-one; in particular: Q′H : R = C 6 H 5 , R′ = C 6 H 5 (C0) ; Q″H : R =C 6 H 5 , R′= CH 3 (CO) ; Q F H : R = C 6 H 5 , R′ = CF 3 (CO) ; Q″H : R = C 6 H 5 , R′ = CCl 3 (CO); Q Br H : R = C 6 H 5 , R′ = p -BrC 6 H 4 (CO) ; Q A H : R =C 6 H 5 , R′ = p -CH 3 O-C 6 H 4 (CO), Q E H : R = C 6 H 5 , R′= C 6 H 13 (C0) ; Q M H : R = CH 3 , R′= C 6 H 5 (C0); Q D H : R = CH 3 , R = CH 3 (C0) ; Q B H : R = C 6 H 5 , R′ = C 6 H 5 (CN( p -CH 3 C 6 H 4 )); L = 2,2′-bipyridine or 1,10-phenanthroline) were synthesized and characterized through analytical and spectral techniques. When (Q) 2 Cu II interacted with an excess of PPh 3 , reduction to copper(I) was observed and (Q)Cu I (PPh 3 ) 2 complexes were synthesized. The complex (Q F )Cu I (PPh 3 ) 2 was characterized by single crystal X-ray diffraction. The coordination environment of copper is a distorted tetrahedron: the P-Cu-P angle is 127.8(1) and the ligand “bite” OCu0 angle is 87.8(3)°; the Cu0 bond distances are 2.075(7) and 2.109(7) A, while CuP are 2.246(3) and 2.254(3) A.