First X-ray structure of discrete anion [HgBr5]3−: Synthesis, characterization and single crystal X-ray structure determination of [Co(NH3)6][HgBr5]

Synthesis, characterization and X-ray structural studies of three hybrid inorganic–organic compounds: Silver(I)-, lead(II)- and tris(phenanthroline)copper(II)- 2,6-naphthalenedisulfonate (2,6-nds)

“…By using ion exchange strategy, we have successfully isolated and structurally characterized hitherto unknown anions: [Hg 2 (SCN) 7 ] 3- [13], [HgBr 5 ] 3- [14], [HgBr 4 Cl] 3- [15], [CdBr 4 Cl 2 ] 4- [16], [CdBr 4 benzoate] 3- [17] and [Cd 2 X 7 ] 3- [18] with appropriate large cation i.e. cationic metal complex.…”

A rational synthesis of new anion [HgBr4Cl]3−: Synthesis, characterization and single crystal X-ray structure determination of [Co(NH3)6][HgBr4Cl]

“…In our earlier investigations, we have reported the synthesis and structural characterization of new anions [Hg 2 (SCN) 7 ] 3− [5] and [HgBr 5 ] 3− [6] with the help of hexamminecobalt(III) cation and it was envisaged that shape and charge on the complex cation [Co(NH 3 ) 6 ] 3+ is conducive for the formation of such anions of hitherto unknown. Our experience with hexamminecobalt(III) cation prompted us to examine whether it is possible to isolate new halogenidomercurate(II) anions similar to [HgBr 5 ] 3− but having the mixed halogens like [HgBr 4 Cl] 3− or [HgBr 3-Cl 2 ] 3− or similar kind.…”

“…Cl) from the symmetrical [HgBr 5 ] 3− ion. During our successful isolation of [HgBr 5 ] 3− anion, we have made the observation that it is possible to transfer one of the bromide ions of [Co (NH 3 ) 6 ]Br 3 to the first coordination sphere of [HgBr 4 ] 2− , resulting the formation of [HgBr 5 ] 3− anion. In an analogous way, we envisaged that the use of another complex [Co(NH 3 ) 6 ]Cl 3 which has very similar charge and topology may also transfer one of its chloride ion to the [HgBr 4 ] 2− that would lead to the formation of a mixed halogenidomercurate(II) anion which may have square pyramidal or trigonal bipyramidal geometry.…”

“…Thus, detection and recovery of any mercurate(II) ion is of environmental concern. The expected product of the above reaction was [Co(NH 3 ) 6 Conductance measurements were carried out at 25°C in aqueous medium and a graph was plotted between Λ (molar conductance) and square root of concentration. When the concentration was extrapolated to zero, the Λ o value obtained was 531 Scm 2 mol − 1 for complex Salt 1, which is close to the 561 Scm 2 In the vibrational spectrum of newly synthesized hexamminecobalt(III) complex salt, stretching vibrations of NH 3 ligands were observed at lower frequency than those of the uncoordinated NH 3 molecules.…”

“…The X-ray crystallography of title complex salt revealed the presence of discrete ions i.e. [Co(NH 3 ) 6 ] 3+ cation and [HgBr 4 Cl] 3− anion. The ORTEPIII view [12] of title complex salt is shown in Fig.…”