Synthesis and characterization of new complexes formed between 1-methyllumazine and 1,6,7-trimethyllumazine ligand with transition metal(II) nitrate. Crystal structure of cobalt(II), copper(II) and cadmium(II) complexes

Luminescent sensor for Cd2+, Hg2+ and Ag+ in water based on a sulphur‐containing receptor: quantitative binding–softness relationship

“…Such an issue is under investigation in our laboratory. However, a number of studies report similar stoichiometry for the complexation of lumazine-like ligands in their ground state with Ag + (30,31), Hg 2+ (32) and Cd 2+ (33). In addition, it is well known that Cd 2+ , Hg 2+ and Ag + (soft acids) can preferentially interact with the sulphur atom (soft base) according to the Pearson's HSAB theory (24).…”

Synthesis, electrolytic behaviour and antimicrobial activities of cadmium complexes of isomers of 3,10-C- meso -3,5,7,7,10,12,14,14-octamethyl-1,4,8,11-tetraazacyclotetradecane

“…The separation of these bands by 115 cm À1 indicates unidentate mode of coordination [9,11,17]. Though NO À 3 can also coordinate as a bidentate ligand [18], this is not possible in this case, because the macrocycle needs to be folded which is difficult due to steric hindrance of eight peripheral methyl groups present. Folding of a 14-membered macrocycle is possible only along a fold axis passing through diagonally opposite nitrogen atoms having their hydrogens lying on the same side [19].…”

Synthesis, X-ray structure and spectroscopic investigation of an eight-coordinate cadmium(II) complex

“…The product was filtered off, washed with 30 cm 3 [11] and refined using full-matrix least-squares procedures on F 2 using SHELXL-97 [12]. Anisotropic displacement parameters for all nonhydrogen atoms [13][14][15][16][17]. Inspection of bond lengths and valence angles for the ligand molecules reveals that double bonds exist between C4 and C5 (C14-C15) and N1 and C2 (N11-C12), rather than between C2 and N3.…”