Sterically encumbered hexakis(alkylseleno)benzenes: conformational behavior of hexakis(iso-propylselenomethyl)benzene toward Hg2+ ions on selective recognition

Synthesis and properties of monometallic, homo- and heterobimetallic complexes based on {(η6-arene)RuCl}+ and {(η6-arene)OsCl}+ fragments with tetrathioether and tetraselenoether ligands

“…Anal. Calc 3 J HH ¼ 6 Hz, aromatic CH), (also a resonance at 5.3 due to CH 2 Cl 2 ). Much weaker resonances often nearly coincident with the peaks listed above (<5% intensity of the major peaks) were observed and are attributed to other invertomers, but it is not possible to assign these to specific forms.…”

“…Ligands with spirocyclic or 1,2,4,5-tetrasubstituted aromatic backbones are sterically incapable of chelating as tetradentates to a single metal centre, but are suitable to bridge two metal centres, although only a small number of examples containing S or Se donor atoms have been described. These include complexes with Hg(II) and Ag(I) [3] and a highly unusual Co(II) complex [CoI 2 {C(CH 2 SMe) 4 }] which is a polymer containing octahedrally coordinated cobalt with bridging k 2 k 02 coordinated ligands in the solid state, but a tetrahedral monomer [CoI 2 {k 2 eC(CH 2 SMe) 4 }] in solution in chlorocarbon solvents [4]. We have recently described a range of substituted metal carbonyl complexes based upon the four ligands C(CH 2 SMe) 4 , C(CH 2 SeMe) 4 , 1,2,4,5-C 6 H 2 (CH 2 SMe) 4 and 1,2,4,5-C 6 H 2 (CH 2 SeMe) 4 [5] coordinated k 2 or k 2 k 02 to one or two metal centres respectively.…”

“…We have recently described a range of substituted metal carbonyl complexes based upon the four ligands C(CH 2 SMe) 4 , C(CH 2 SeMe) 4 , 1,2,4,5-C 6 H 2 (CH 2 SMe) 4 and 1,2,4,5-C 6 H 2 (CH 2 SeMe) 4 [5] coordinated k 2 or k 2 k 02 to one or two metal centres respectively. We have also described complexes [Mn(CO) 3 Cl{(CH 2 ) 2 C(CH 2 EMe) 2 }] (E ¼ Se or Te) and [MCl(h 6 -p-cymene){(CH 2 ) 2 C(CH 2 EMe) 2 }]PF 6 (M ¼ Ru or Os) of the cyclopropyl-backboned bidentates (CH 2 ) 2 C(CH 2 EMe) 2 [6]. We report here studies of the four tetradentates C(CH 2 SMe) 4 , C(CH 2 SeMe) 4 , 1,2,4,5-C 6 H 2 (CH 2 SMe) 4 and 1,2,4,5-C 6 H 2 (CH 2 SeMe) 4 with areneeruthenium(II) and -osmium(II) centres and some homo-and heterobimetallic derivatives.…”

Macrocyclic compound as ionophores in lead(II) ion-selective electrodes with excellent response characteristics

“…The lead(II) ion-selective electrodes have shown widely potential applications in the potentiometric titration, and flow injection potentiometry, and in the direct determination of lead in stack emissions of lead smelters, and assay of lead in rocks, particularly in the direct measurements of trace amount of lead(II) in human hair, blood, edible oil, food, water, and air. macrocyclic compound, ionophore, ion-selective electrode, lead ion Ion-selective electrode (ISE) is a potentiometric sensor having a potential response selectively to the specific ions in solutions [1,2] . Compared with other methods, the ISE-based analysis can provide a fast, accurate, reliable, portable, convenient and inexpensive analytical technique that is especially invulnerable to the color and turbidity of analyte solutions and suitable for in-situ online measurement.…”

“…Ion-selective electrode (ISE) is a potentiometric sensor having a potential response selectively to the specific ions in solutions [1,2] . Compared with other methods, the ISE-based analysis can provide a fast, accurate, reliable, portable, convenient and inexpensive analytical technique that is especially invulnerable to the color and turbidity of analyte solutions and suitable for in-situ online measurement.…”