14876-64-3Relevant articles and documents
Moser, H. C.,Voigt, A. F.
, p. 354 - 357 (1957)
Selective Hg(II) detection in aqueous solution with thiol derivatized fluoresceins
Nolan, Elizabeth M.,Racine, Maryann E.,Lippard, Stephen J.
, p. 2742 - 2749 (2006)
The syntheses and photophysical properties of mercury sensors 2 and 3 (MS2 and MS3), two asymmetrically derivatized fluorescein-based dyes designed for Hg(II) detection, are described. These sensors each contain a single pyridyl-amine-thiol metal-binding moiety, form 1:1 complexes with Hg(II), and exhibit selectivity for Hg(II) over other Group 12 metals, alkali and alkaline earth metals, and most divalent first-row transition metals. Both dyes display superior brightness (Φ X ∈) and fluorescence enhancement following Hg(II) coordination in aqueous solution. At neutral pH, the fluorescence turn-on derives from greater brightness due to increased molar absorptivity. At higher pH, photoinduced electron transfer quenching of the free dye is enhanced, and the Hg(II)-induced turn-on also benefits from alleviation of this pathway. MS2 can detect ppb levels of Hg(II) in aqueous solution, demonstrating its ability to identify environmentally relevant concentrations of Hg(II).
Griffiths, T. R.,Symons, M. C. R.
, p. 1752 - 1761 (1960)
Electronic Spectra and Geometries of HgX3- in Water and an Assessment of various Computing Procedures for revealing Hidden Spectra
Griffiths, Trevor R.,Anderson, Richard A.
, p. 1425 - 1435 (1990)
The electronic absorption spectra, in the visible and ultraviolet regions, of HgX3- (X = Cl, Br or I) have for the first time been obtained, by computer techniques, free from any contributions of HgX2 or HgX42-.Four different independent methods are described and evaluated for this system and for general use.For systems where the desired spectrum is completely hidden below other bands, here for HgBr3- and HgCl3-, a combination of two methods is needed.Additional tests to validate the computed spectra are described and advised.The spectra of HgX3- were resol ved into their component Gaussian bands and the transitions identified and assigned.This permitted the identification of HgCl3- as planar with D3h symmetry and HgI3- as pyramidal, with C3v symmetry, suggesting that the solvated species are trigonal-bipyramidal and tetrahedral, respectively.The spectrum of HgBr3- appears to show features of both symmetries, but it is closer to pyramidal geometry.
Structure of solvated mercury(ii) halides in liquid ammonia, triethyl phosphite and tri-n-butylphosphine solution
Nilsson, Kersti B.,Maliarik, Mikhail,Persson, Ingmar,Sandstroem, Magnus
, p. 2303 - 2313 (2008/09/19)
Liquid ammonia, trialkyl phosphites, and especially trialkylphosphines, are very powerful electron-pair donor solvents with soft bonding character. The solvent molecules act as strongly coordinating ligands towards mercury(ii), interacting strongly enough to displace halide ligands. In liquid ammonia mercury(ii) chloride solutions separate into two liquid phases; the upper contains tetraamminemercury(ii) complexes, [Hg(NH3)4] 2+, and chloride ions in low concentration, while the lower is a dense highly concentrated solution of [Hg(NH3)4] 2+ entities, ca. 1.4 mol dm-3, probably ion-paired by hydrogen bonds to the chloride ions. Mercury(ii) bromide also dissociates to ionic complexes in liquid ammonia and forms a homogeneous solution for which 199Hg NMR indicates weak bromide association with mercury(ii). When dissolving mercury(ii) iodide in liquid ammonia and triethyl phosphite solvated molecular complexes form in the solutions. The Raman ν(I-Hg-I) symmetric stretching frequency is 132 cm-1 for the pseudo-tetrahedral [HgI 2(NH3)2] complex formed in liquid ammonia, corresponding to DS = 56 on the donor strength scale. For the Hg(ClO4)2/NH4I system in liquid ammonia a 199Hg NMR study showed [HgI4]2- to be the dominating mercury(ii) complex for mole ratios n(I-): n(Hg 2+) 6. A large angle X-ray scattering (LAXS) study of mercury(ii) iodide in triethyl phosphite solution showed a [HgI2(P(OC 4H9)3)2] complex with the Hg-I and Hg-P bond distances 2.750(3) and 2.457(4) A, respectively, in near tetrahedral configuration. Trialkylphosphines generally form very strong bonds to mercury(ii), dissociating all mercury(ii) halides. Mercury(ii) chloride and bromide form solid solvated mercury(ii) halide salts when treated with tri-n-butylphosphine, because of the low permittivity of the solvent. A LAXS study of a melt of mercury(ii) iodide in tri-n-butylphosphine at 330 K resulted in the Hg-I and Hg-P distances 2.851(3) and 2.468(4) A, respectively. The absence of a distinct I-I distance indicates flexible coordination geometry with weak and non-directional mercury(ii) iodide association within the tri-n-butylphosphine solvated complex. This journal is The Royal Society of Chemistry.
