Mercury Bromide Research Articles

Vapour phase Raman spectra of mercury(II) chloride, mercury(II) bromide and mercury(II) iodide. ν1(Σ+g) band contours and the mercury—halogen bond polarisability derivatives

The separations of the O and S rotational branches of the ν1(Σ+g) fundamentals of mercury(II) chloride, mercury(II) bromide, and mercury(II) iodide in the vapour phase are found to be in agreement with the predictions of the Placzek–Teller theory. The mercury–halogen bond polarisability derivatives, determined from vapour phase intensity measurements and the appropriate depolarisation ratios, are found to be 2.5 (HgCl), 3.7 (HgBr) and 5.3 (HgI)A2.

Electrophilic addition to hexafluorobut-2-yne complexes of platinum(0), rhodium(I), and iridium(I)

The hexafluorobut-2-yne complexes, Pt(CF3CCCF3)L2(L = PPh3, PMePh2, PMe2Ph, PEt2Ph; 2L = Ph2PCH2CH2PPh2) react with trifluoroacetic acid to give the square planar alkenyl complexes, Pt(OCOCF3)(CF3CCHCF3)L2 in which the phosphine ligands have a relative cis-configuration. The complex, cis-Pt(OCOCF3)(CF3CCHCF3)(PPh3)2 can be thermally isomerised to its trans-isomer and cis–trans isomerisation also occurs in [2H6] acetone solution. The action of heat on cis-PtCl(CF3CCHCF3)(PMePh2)2 also effects isomerisation to the trans-isomer. Mercury(II) chloride and bromide similarly react with Pt(CF3CCCF3)(PPh3)2 and Pt(CF3CCCF3)(PMePh2)2 to give the mercuriated products [PtCl{CCF3C(HgCl)CF3}(PPh3)2] and cis-[PtX{CF3CC(HgX)CF3}(PMePh2)2](X = Cl or Br). Protonation of RhCl(CF3CCCF3)(PPh3)2 and IrCl(CO)(CF3CCCF3)(PPh3)2 gives the alkenyl complexes RhCl2(CF3CCHCF3)(PPh3)2 and IrCl(OCOCF3)(CF3CCHCF3)(CO)(PPh3)2 respectively but W(MeCN)(CF3CCCF3)3 does not react with trifluoroacetic acid under normal conditions.

Molecular-sieve catalysed N→N glycosyl migration in the v-triazolo[4,5-d]pyrimidine ring system

Migration of the glycosyl group of 7-(methylthio)-2-(2,3,5-tri-O-acetyl-β-D-ribofuranosyl)-v-triazolo[4, 5-d]pyrimidine from N-2 to N-3 has been observed; the migration was catalysed by molecular sieve and less effectively by mercury(II) bromide.

X-ray study of barenylmercury halides spontaneous symmetrization of phenylbarenylmercury iodide in the crystal

A crystallographic investigation of the structure of (methyl- and phenyl- barenyl)mercury bromide and (phenylbarenyl)mercury iodide has been undertaken. The bond lenghts of the HgBr and HgI bonds of these compounds are unchanged in comparison with those in compounds containing less electron-acceptor radicals. Only in the case of the (phenylbarenyl)mercury iodide does the intermolecular contact Hg…I decrease (3.29 Å instead of the usual 3.81−4.2 Å). In the crystal state (phenylbarenyl)mercury iodide was observed to undergo spontaneous symmetrization. This effect has been explained in terms of the strong intermolecular coordination between the mercury and iodine atoms of the two molecules in the crystallographic dimer.

Iododemercuration of (Pentafluorophenyl)- and (pentachlorophenyl)mercury bromides

Reaction of (perfluorophenyl)- and (perchlorophenyl) mercury bromides with iodine in DMF follows the first order which is discussed in terms of the S E1(N) mechanism. In benzene an analogous reaction proceeds only in the presence of iodide ions. In both solvents the reaction with I − 3 follows the second order kinetics. A mechanism is suggested in which iodinating agent plays the role of a nucleophilic catalyst, S E1(I − 3).

Mercury(II) chloride and bromide complexes with some pyridine N-oxides

Mercury(II) chloride and bromide complexes with some pyridine N-oxides

Dimeric tetrahedral complexes of mercury(II) chloride and bromide with some pyridine N-oxides

1 : 1 Complexes of pyridine N-oxide, and 2-methyl, 3-methyl, and 4-methyl, 2,6-dimethyl, and 4-cyano pyridine N-oxides with mercury(II) chloride and bromide have been prepared and characterised by molecular conductance and i.r. spectral measurements (down to 222 cm.–1). It is suggested that these complexes are dimeric tetrahedral structures with halogen bridges in the solid state. Assignments for the mercury(II)–oxygen and mercury (II)–halogen modes have also been made.

Complexes of pyridines and methylpyrazine with come zinc(II), cadmium(II), and mecury(II) salts

Complexes of pyridine and 2-methyl-, 3-methyl-,4-methyl-, 2,4-dimethyl-, and2,6-dimethyl-pyridine with mercury(II) chloride and bromide and of methylpyrazine with zinc(II) chloride, iodide, and sulphate; cadmium(II) chloride, bromide, iodide, thiocyanate, and acetate; and mercury(II) chloride and bromide have been prepared and characterised by molecular conductance and i.r. spectral measurements (down to 200 cm.–1). Possible structures for these complexes in the solid state are discussed.

Positive and negative ion mass spectra of some pentafluorophenylmercurials

The positive and negative ion mass spectra of bis(pentafluorophenyl)mercury and pentafluorophenylmercuric chloride and bromide show both distinct similarities and differences.

Mass spectrometry of volatile mercury salts

The integrated ion current method is applied to the determination of μg quantities of mercury(II) chloride. The mass spectra of both mercury(I) and (II) chlorides indicate that the analytical reagent grade chemicals contain traces of mercury(II) bromide and iodide.

The use of mercury(II) bromide as coating in a piezoelectric crystal detector

The use of mercury(II) bromide as coating in a piezoelectric crystal detector

Solvent Extractions from Molten Salts. IV.1 Kinetics of the Formation of Mercury(II) Bromide Species

Solvent Extractions from Molten Salts. IV.¹ Kinetics of the Formation of Mercury(II) Bromide Species

The synthesis of some mercury organic compounds

We have synthesized diallylmercury, di-o-anisyl mercury, di-m-flurophenyl mercury, di-m- and di-p-chlorophenyl mercury, di-o-carbomethoxyphenyl mercury, and m-fluorophenyl mercuric bromide.

Photochemical initiation of polymerization of tetrafluoroethylene by mercury bromides

Eine heterogene Polymerisation von Tetrafluorathylen wurde durch Merkuri- und Merkurobromide in naturlichem Licht oder solchem von 3650 A Wellenlange, nicht aber in blauem Licht, ausgelost. Es ist moglich, dass Bromatome vom angeregten Quecksilberbromid zum adsorbierten Tetrafluorathylen ubertragen werden.

Ultraviolet bands of mercury bromide

The ultraviolet bands of mercury bromide have been excited in uncondensed discharge and photographed with a quartz Littrow spectrograph. The class II system, lying between\lambda 2900 a to 2700 a, suggested byWieland as due to the triatomic molecule, has been studied in detail and ascribed to the diatomic molecule. The bands in the regionlambda 2900 a to 2770a have been analysed into two systems which may form the two components of a2 II –2 \sigma electronic transition with a2 II interval equal to 969·4 cm–1.Another system most probably due to2 \sigma–2 \sigma has been observed in the region\lambda 2770 to 2720.

Methylene Bromide as a Quenching Agent in Geiger–Müller Counters

GEIGER-MULLER counters filled with methylene bromide and argon are known1 to be self-quenching and to possess long sloping plateaux. Measurements have now been made of the β-counting-rate as a collimated source was moved diametrically across the mica end-window of a β-ray counter so that β-particles entered the counter parallel to the centre wire. Two counters A and B of identical construction were used for these measurements, A containing argon at a pressure of 97 mm. of mercury and ethyl alcohol at a pressure of 9·7 mm. of mercury, and B containing argon at a pressure of 7·4 mm. of mercury and methylene bromide at a pressure of 7·4 mm. of mercury. It was found that the efficiency of counter B was greatest for particles entering the counter near the centre wire, but even then was less than that of counter A by a factor of about three.

Electrometric Investigation of Equilibria between Mercury and Halogen ions. VI. Complexes between Hg2+ and Br- and some Equilibria involving Solid Mercury(I)bromide.

Electrometric Investigation of Equilibria between Mercury and Halogen ions. VI. Complexes between Hg2+ and Br- and some Equilibria involving Solid Mercury(I)bromide.