Interaction of environmentally important metal ions with nitrogen–sulfur-donor macrocycles. The crystal structures of seven-co-ordinate lead(II) and mercury(II) complexes of an 18-membered N₄S₂macrocycle

Preparation and Characterisation of CdII, HgII and PbII Complexes of a Macrodinucleating Hexaaza‐dithiophenolate Ligand

“…Similar findings have been observed for other cadmium complexes of macrocyclic ligands. [10,20] The 13 C NMR spectroscopic data of the mercury complex 4 differ significantly from those of the compounds above and, as we will show below, this complex exhibits C 1 symmetry in the solid state. This symmetry arises because of different configurations for the two chiral amine donors in the two opposing diethylene triamine units [e.g.…”

“…Consequently, a large number of N,S-based macrocycles have been reported and their binding properties towards environmentally important elements have been investigated. [10,11] To the best of our knowledge, the thiophenolate derivatives [12Ϫ14] of Robson-type macrocycles have not yet been tested in this respect. This led us to investigate the ligating properties of the dinucleating hexaaza-thiophenolate ligand (L Me ) 2Ϫ (see Scheme 1) [15,16] towards the metal ions Cd II , Hg II and Pb II .…”

Design of novel podand‐like compounds with two short diphenylphosphine oxide pendant arms

“…116.3 (1) C (3) C (8) P (2) 112.6 (1) C (1) C (7) P (1) 115.4 (1) C (4) C (5) C (9) 119.2 (2) C (6) C (5) C (9) 121.4 (2) C (4) C (3) C (8) 120.2 (2) C (2) C (3) C (8) 121.1 (2) C (2) C (1) C (7) 119.1 (2) C (6) C (1) C (7) 121.0 (2) Central benzene C C C 120.0 (2) b Phenyl C C C 120.0 (3) b P C Ph C Ph 117.9 (2);123.1 (2) b,c C (2) C (1) C (7) P (1) −121.0 (2) C (1) C (7) P (1) C (10) 167.9 (2) C (7) P (1) C (10) C (11) −51.1 (2) C (7) P (1) C (10) C (15) 129.9 (2) C (6) C (1) C (7) P (1) 60.9 (2) C (1) C (7) P (1) C (16) 54.4 (2) C (7) P (1) C (16) C (17) −136.7 (2) C (7) P (1) C (16) C (21) 43.9 (2) C (1) C (7) …”

“…The aim of our study was to confirm complexing possibilities of 1,3,5-benzene-tris(methylenediphenylphosphine oxide) (1) and propose a new compound which is expected to have more promising complexing properties. Solid state studies if not directly applicable to the solution phase are important in this area, as they involve the key molecules, and can confirm the type of cation binding [9].…”

“…The design of cation binding compounds for biological, environmental, or recycling purposes is of crucial importance [1]. The development of new technologies, based on binding cations, is restrained by properties of used ligands.…”