Crystal structure and electronic properties of bis(2,2′-bipyridyl)-thiocyanatocopper(II) tetrafluoroborate

A Novel Structure of Bipyridine Coordinated with Copper (II): [Cu(bipy) (H2O)3] · (NO3)2

“…In most of these complexes, the ratio of copper and bipyridine is 1 : 2 (CAIEUGO et al; HARRISON et al 1981;TYAGI et al;NAKAI et al). The water molecule is difficult to coordinate with copper(II), due to the strong coordination ability of bipyridine with copper(I1).…”

Spectral and electrochemical studies of bis(diimine)copper(II) complexes in anionic, cationic and nonionic micelles

“…The complex [Cu(bpy) 2 Cl]Cl [39][40][41][42][43] 1 was prepared as reported in the literature [40]. The complex [Cu(phen) 2 Cl]Cl [44][45][46][47][48][49][50] 2 was also prepared as reported in the literature [44].…”

“…All the present bis(diimine)copper(II) complexes conform to the general formula CuL 2 Cl 2 ÁnH 2 O (n = 0,1,2). The complex cations [Cu(bpy) 2 Cl] + [40,43] and [Cu(phen) 2 Cl] + [44][45][46][47][48][49][50], possess a distorted trigonal bipyramidal geometry in which the trigonal plane is composed of copper(II) bound to two nitrogen atoms, one each from the two diimine ligands, and a chloride ion and the axial positions are occupied by the remaining two diimine nitrogen atoms. The related complexes [Cu(4-Me-phen) 2 Cl] + , [Cu(5-Me-phen) 2 Cl] + and [Cu(4-NO 2 -phen) 2 Cl] + are expected to possess a coordination geometry similar to that of [Cu(phen) 2 [54][55][56] to display a tetragonally distorted octahedral geometry in which the corners of the square plane are occupied by one nitrogen atom each of the two diimine ligands, a chloride ion and water and the axial positions by the remaining two nitrogen atoms of the diimines.…”

Coordination geometry in bis(di-2-pyridylamine)copper(II) complexes. Crystal structures and spectroscopic properties of [Cu(L)2(NCS)2][Cu(L)2(NCS)]X, X= , I−

“…The complexes Cu(chelate) 2 X 2 or Cu(chelate) 2 XY (chelate ¼ 2,2 0 -bipyridyl (bpy) or 1,10-phenanthroline (phen); X, Y ¼ various anions, coordinated or not) exemplify this [1,2] and much structural data are available [3][4][5][6][7][8]; structural data are more limited for corresponding complexes containing the more flexible ligand di-2-pyridylamine (dpyam) [5,[9][10][11][12][13][14][15][16][17]. The coordination geometry in the five-coordinate complexes [Cu(chelate) 2 X]Y (chelate ¼ bpy or phen) tends to be nearly regular trigonal bipyramidal with slight distortion towards square pyramidal ( > 0.5), e.g., [Cu(bpy) 2 (NCS)](NO 3 ) ( ¼ 0.89) [18], [Cu(bpy) 2 (NCS)](NCS) ( ¼ 0.65) [19], [Cu(bpy) 2 (NCS)](BF 4 ) ( ¼ 0.61) [20], [Cu(bpy) 2 (NH 3 )](BF 4 ) 2 ( ¼ 0.77) [21] and [Cu(phen) 2 (NCS)](ClO 4 ) ( ¼ 0.81) [7]. With chelate ¼ dpyam, complexes tend towards square-based pyramidal geometry with slight distortion towards trigonal bipyramidal ( < 0.5), e.g., [Cu(dpyam) 2 (NCS)] þ ( ¼ 0.…”