Copper(II) chloride–1-methylbenzotriazole chemistry: variation of product as a function of metal-to-ligand reaction ratio; synthesis, structure and properties of a dinuclear complex and a novel chain polymer with two alternating chromophores

The “periodic table” of benzotriazoles: Uranium(VI) complexes

“…Crystallographic data for 1, 2, 3 and 4 · diMebtaH · MeCN have been deposited with the Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax + 44 1223 336 033; e-mail: Table S2, thin cyan lines), extended parallel to the [1][2][3][4][5][6][7][8][9][10] crystallographic direction in the crystal structure of complex 2. b) The U2-containing molecules form chains through intermolecular π-π (dark green lines) and "non-classical" H-bonding interactions (C13-H13⋯O6, Table S2, thin cyan lines), extended parallel to the b axis. These chains cross each other at points above and below the 6MebtaH ligands creating the 3D structure shown in c and resulting in stacks of ligands presented in d. Light green, yellow and dark green thick lines indicate the three different types of π-π overlaps in the structure of the complex, shown in e, f and g, respectively, with the corresponding distances and angles between the planes being 3.50 Å and 0°(e), 3.37 Å and 5.5°(f), and 3.44 Å and 0°(g).…”

“…S9-S11) of the uranyl complexes 1, 2 and 4 · diMebtaH · MeCN in d 6 -DMSO reveal that these compounds decompose in solution to release the benzotriazole ligand; the spectra of the complexes are identical with those of the corresponding free ligands Mebta, 5MebtaH and diMebtaH, respectively. For example, the spectrum of 1 shows a sharp singlet at δ 4.30, a triplet at δ 7.39, a triplet at δ 7.55, a doublet at δ 7.83 and a doublet at δ 8.01 ppm, with relative [1,2,3]triazole or simply benzotriazole (btaH; R_R΄_R΄΄_H). R, R΄ and R΄΄ can be non-donor (Me, Cl, NO 2 ,…) or donor (OH, COOH, CH 2 OH, CH 2 COOH,…) groups.…”

“…Over the last 30 years or so, we [1][2][3][4][5][6][7][8] and other groups [8][9][10][11][12][13][14][15][16][17] have been exploring the coordination chemistry of benzotriazoles. Research in this area ranges from efforts to model the corrosion inhibition of some metals (particularly Cu and its alloys) by benzotriazoles [18], to the synthesis of benzotriazolato coordination clusters [2,[4][5][6][7]9,11,13,15] and polymers [1,3,12,14,16,17] with esthetically pleasing structures and exciting physical properties. Although the use of this family of ligands has been investigated widely in 3d- [1-11, 13-15,17] and 4f-metal [12,16] chemistry, their employment in the chemistry of 5f-metal ions has completely been ignored.…”

catena-Poly[copper(II)-μ-aqua-di-μ-benzotriazole]

“…In recent years, studies of the coordination chemistry of benzotriazole (Bta) and its ring-substituted derivatives have attracted increasing interest owing to their superior anticorrosion effect when they are exposed to certain metals, especially copper and its alloys (Bakalbassis et al, 1995;Reedijk et al, 1979;Skorda et al, 1981;Tangoulis et al, 1998;Tangoulis et al, 2000;Olby et al, 1990). To understand the complex surface chemistry that leads to corrosion inhibition and to create new inhibitors more efficient than Bta, primary investigations have focused on the chemical, physical and structural studies of realistic model complexes.…”

Facile N–N coupling and copper (II) promoted cleavage of N,N′-linked N-methylbenzimidazole

“…1) [24]. The crystal structure of Ia, basically similar to the dimeric [(Benzotriazole) 2 Cu(l-Cl)] 2 Cl 2 , [25] consists of isolated binuclear molecules with two bridging chloride ligands. Each five-coordinate copper is bonded to one terminal and two bridging chlorides, as well as two N-methylbenzimidazole nitrogen atoms.…”