Hydrogen-bonded supramolecular architectures in (N-(methylpyridin-2-yl)-amidino-O-alkylurea)copper(ii) halides

Reactivity of Thiosemicarbazides with Redox Active Metal Ions: Controlled Formation of Coordination Complexes versus Heterocyclic Compounds

“…Thermal ellipsoids at 50 % probability. Selected bond distances () and angles (8): [ [51][52][53] The phenyl rings are perpendicular to the ligand chain, the angles being 74.26 and 83.758. All of the NH groups participate in hydrogen bonding, with both the free and coordinated Cl atoms acting as acceptors together with the solvent.…”

Binding studies of ( N -(methylpyridin-2-yl)-amidino- O -methylurea)copper(II) complexes to four nitrogenous bases and 5′-GMP

“…Complexes 1 and 2 have exhibited the different coordination geometries according to their electronic transitions in solid states which adopt a square pyramid for 1 [19] and possibly square planar for 2 (Fig. 2).…”

“…The binding of copper(II) complexes with nucleobases can be used in biological experiments as DNA binding and/or cleavage agents [12][13][14][15][16][17][18]. Copper(II) complexes containing N-(methylpyridin-2-yl)-amidino-O-methylurea (L) and different anions, Cl À (1) and ClO 4 À (2) were previously prepared and structurally characterized by our group [19,20]. The L ligand, a guanidine derivative, is a chelating N,N,N-tridentate ligand and is of considerable interest owing to their hydrogen-bond mediated interactions [19,[21][22][23][24] and their wide range in biological activities [25][26][27].…”

“…Their differences may come from the type of anionic ligands, which differ in both size and shape. The crystal structure of 1, [Cu(L)Cl 2 ], involves a five-coordinate CuN 3 Cl 2 chromophore constituted by three nitrogen atoms from the L ligand and two chloride anions at the remaining basal plane and one apical site [19], giving a square pyramidal geometry as the original product. Recrystallization of 2 in methanol solution gave crystals with the formula of [Cu(L)(CH 3 one oxygen atom from methanol occupying a square basal plane, and one oxygen atom from one perchlorate anion locating at the apical position, resulting in the CuN 3 O 2 chromophore [20].…”

“…Copper(II) complexes containing N-(methylpyridin-2-yl)-amidino-O-methylurea (L) and different anions, Cl À (1) and ClO 4 À (2) were previously prepared and structurally characterized by our group [19,20]. The L ligand, a guanidine derivative, is a chelating N,N,N-tridentate ligand and is of considerable interest owing to their hydrogen-bond mediated interactions [19,[21][22][23][24] and their wide range in biological activities [25][26][27]. Several groups have reported the potent antitumor, antiviral and antifungal activities of some natural and artificial compounds possessing guanidine groups [28][29][30].…”