“…Thiocyanates are ligands well-known to form MSCNM‘ bridges. A large number of complexes have been previously reported in which one of the metal centers being bridged is mercury. − In contrast, more limited literature is available when one of the metal centers is ruthenium. − 3 Molecular structure of the N719 − HgCl 2 complex showing (a) the asymmetric unit which contains one mercury atom, crystallographically disordered in two positions at half-occupancy, one [Ru(N 2 C 12 O 4 H 8 ) 2 (NCS) 2 ] complex, and two Cl - anions (disordered atoms from the carboxylic units and H atoms have been omitted for clarity) and (b) a representation of the structure of the [Ru(N 2 C 12 O 4 H 8 ) 2 (NCS) 2 HgCl] n n + chains parallel to the a axis.…”
The selectivity and sensitivity of two colorimetric sensors based on the ruthenium complexes N719 [bis(2,2'-bipyridyl-4,4'-dicarboxylate)ruthenium(II) bis(tetrabutylammonium) bis(thiocyanate)] and N749 [(2,2':6',2' '-terpyridine-4,4',4' '-tricarboxylate)ruthenium(II) tris(tetrabutylammonium) tris(isothiocyanate)] are described. It was found that mercury ions coordinate reversibly to the sulfur atom of the dyes' NCS groups. This interaction induces a color change in the dyes at submicromolar concentrations of mercury. Furthermore, the color change of these dyes is selective for mercury(II) when compared with other ions such as lead(II), cadmium(II), zinc(II), or iron(II). The detection limit for mercury(II) ions--using UV-vis spectroscopy--in homogeneous aqueous solutions is estimated to be approximately 20 ppb for N719 and approximately 150 ppb for N749. Moreover, the sensor molecules can be adsorbed onto high-surface-area mesoporous metal oxide films, allowing reversible heterogeneous sensing of mercury ions in aqueous solution. The results shown herein have important implications in the development of new reversible colorimetric sensors for the fast, easy, and selective detection and monitoring of mercuric ions in aqueous solutions.
“…Thiocyanates are ligands well-known to form MSCNM‘ bridges. A large number of complexes have been previously reported in which one of the metal centers being bridged is mercury. − In contrast, more limited literature is available when one of the metal centers is ruthenium. − 3 Molecular structure of the N719 − HgCl 2 complex showing (a) the asymmetric unit which contains one mercury atom, crystallographically disordered in two positions at half-occupancy, one [Ru(N 2 C 12 O 4 H 8 ) 2 (NCS) 2 ] complex, and two Cl - anions (disordered atoms from the carboxylic units and H atoms have been omitted for clarity) and (b) a representation of the structure of the [Ru(N 2 C 12 O 4 H 8 ) 2 (NCS) 2 HgCl] n n + chains parallel to the a axis.…”
The selectivity and sensitivity of two colorimetric sensors based on the ruthenium complexes N719 [bis(2,2'-bipyridyl-4,4'-dicarboxylate)ruthenium(II) bis(tetrabutylammonium) bis(thiocyanate)] and N749 [(2,2':6',2' '-terpyridine-4,4',4' '-tricarboxylate)ruthenium(II) tris(tetrabutylammonium) tris(isothiocyanate)] are described. It was found that mercury ions coordinate reversibly to the sulfur atom of the dyes' NCS groups. This interaction induces a color change in the dyes at submicromolar concentrations of mercury. Furthermore, the color change of these dyes is selective for mercury(II) when compared with other ions such as lead(II), cadmium(II), zinc(II), or iron(II). The detection limit for mercury(II) ions--using UV-vis spectroscopy--in homogeneous aqueous solutions is estimated to be approximately 20 ppb for N719 and approximately 150 ppb for N749. Moreover, the sensor molecules can be adsorbed onto high-surface-area mesoporous metal oxide films, allowing reversible heterogeneous sensing of mercury ions in aqueous solution. The results shown herein have important implications in the development of new reversible colorimetric sensors for the fast, easy, and selective detection and monitoring of mercuric ions in aqueous solutions.
“…Studies reported by several researchers have shown that N - (or S -) coordinated tetrazole–thiolates are formed through dipolar cycloaddition reactions of main-group or transition-metal azido complexes with unsaturated organic compounds, such as R–NCS, R–SCN, and CS 2 . 1,2,10–17 In addition, metathesis reactions involving late-transition-metal halides and alkali-metal tetrazolates are known to afford S - or N -coordinated tetrazolato complexes of transition metals. 18,19 Some late transition-metal tetrazole–thiolates have been synthesized by the deprotonation of organic tetrazole–thiones in the presence of amines, NaOH, or metal acetates.…”
Mono or bis(tetrazole-thiolato) Pd(II) or Pt(II) complexes were obtained from dialkyl Pd(II) or Pt(II) complexes with organic tetrazole-thiones (1-aryl or 1-alkyl-1H-tetrazole-5-thiones) via deprotonation. In contrast, equimolar reactions of zerovalent Pt(0)...
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