Crystal structure of dichlorotetra-µ-adenine-dicopper(II) chloride hexahydrate

SOD-Mimic Cu(II) Dimeric Complexes Involving Kinetin and Its Derivative: Preparation and Characterization

“…The best-fitted parameters of 1 were J = −290 cm −1 , g = 2.03, and x PI = 5.2% (Table 1, Figure 5). The resulting J value for 1 is comparable to those [ J = (−285)–(−329) cm −1 ] reported for the Cu(II) dimers with four NCN bridges, for which the X-ray structures have been determined, for example, [Cu 2 ( μ -AzabH) 4 Cl 2 ]Cl 2 ·3CH 3 OH [21], [Cu 2 ( μ -AdeH) 4 Cl 2 ]Cl 2 ·6H 2 O [22, 23], [Cu 2 ( μ -AdeH) 4 (H 2 O) 2 ](ClO 4 ) 4 ·2H 2 O [23, 24], and [Cu 2 ( μ -4ClLH x ) 4 (ClO 4 ) 2 ](ClO 4 ) 2 ·2EtOH·H 2 O [8]; AzabH = 4-azabenzimidazole, AdeH = adenine, 4ClLH x = N6-(4-chlorobenzyl)adenine. The experimental data of 2 were fitted with J = −162 cm −1 , g = 2.05, and x PI = 0.7% (Table 1, Figure 5), which means that the antiferromagnetic exchange for 2 was found to be substantially smaller than that for 1 .…”

Dinuclear copper(II) complexes containing 6-(benzylamino)purines as bridging ligands: Synthesis, characterization, and in vitro and in vivo antioxidant activities

“…Following these results, it could be deduced that the composition of the complexes 1-4 should be interpreted as [Cu 2 (l-HL n ) 4 Cl 4 ] Á 2H 2 O. However, we have reason to believe that the composition of complexes 1-4 was proposed correctly, mainly in connection with structural similarity of the complexes with that of [Cu 2 (l-AdeH) 4 Cl 2 ]Cl 2 Á 6H 2 O (AdeH = adenine) which structure was determined by a single crystal X-ray analysis [22]. Generally, it may be concluded that significantly reduced conductivity values might be also ascribed to an imperfect dissociation of the discussed complexes in the solvent used.…”

Spectroscopic, magnetic, and electrochemical studies of a dimeric N-substituted-sulfanilamide copper(II) complex. X-ray and molecular structure of the Cu2(N-(pyridin-2-yl)biphenyl-4-sulfonamidate)4 complex

“…Other non linear triatomic bridging ligands are of NNN or NCN type. The former is observed in case of the 1,3-diphenyltriazene anion [1][2][3][4] and the latter is reported in adenine complexes [5][6][7][8][9][10][11][12]. The structure of this type of complexes is a paddle-wheel similar to that of Cu-acetate and related carboxylates [13][14][15][16][17][18][19].…”