Pentaammineperrhenatocobalt(III) Salts

Lenz, Elizabeth; Murmann, R. Kent; Swiniarski, Mary F.; Fild, M.; Archer, Ronald D.

doi:10.1002/9780470132432.ch36

Cited by 5 publications

(2 citation statements)

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“…The addition of saturated LiCl, LiNO 3 , and LiClO 4 solutions at 0 • C resulted in crystalline [Co(NH 3 ) 5 OReO 3 ]X 2 compounds in 60-80% yield. The violet-red chloride salt is not stable for a long time, even in the solid state, and an internal replacement takes place with the chloride ion resulting in some [Co(NH 3 ) 5 Cl] 2+ derivative [118][119][120]. The violet-red perchlorate salt, however, is stable in the solid state over a period of 6 months [114][115][116].…”

Section: [Pentammine(aquo)cobalt(iii)] Perrhenate Dihydratementioning

confidence: 99%

“…The vibrational spectra (IR and Raman) and factor group analysis were carried out for the chloride salt, and all the normal modes for the cation and anion have been assigned. A relative bond strength parameter (ε) for the ammonia molecules in ammine complexes [117], as defined by Grinberg, was found to be 0.94 and 0.90 for the coordinated ammonia, which shows that the average strength of the hydrogen bonds in this compound is between the strength of an average hydrogen bond strengths in [Co(NH 3 ) 6 ]Cl 3 [120] and [Co(NH 3 ) 6 ](MnO 4 ) 3 [61,117]. Its solid phase UV-Vis spectrum at room temperature consists of strongly overlapping bands of four possible d-d transitions of the [Co(NH 3 ) 6 ] 3+ cation and CT bands of the permanganate anion.…”

Section: Hexammine Complexesmentioning

confidence: 99%

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Review on the Chemistry of [M(NH3)n](XO4)m (M = Transition Metal, X = Mn, Tc or Re, n = 1–6, m = 1–3) Ammine Complexes

Mehrotra

2023

Inorganics

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The preparation of ammine complexes of transition metals having oxidizing anions such as permanganate and perrhenate ions is a great challenge due to possible reactions between ammonia and oxidizing anions during the synthesis of these materials. However, it has an important role in both the development of new oxidants in organic chemistry and especially in the preparation of mixed-metal oxide catalyst precursors and metal alloys for their controlled temperature decomposition reactions. Therefore, in this paper, synthetic procedures to prepare ammonia complexes of transition metal permanganate, pertechnetate, and perrhenate (the VIIB group tetraoxometallates) salts have been comprehensively reviewed. The available data about these compounds’ structures and spectroscopic properties, including the presence of hydrogen bonds that act as redox reaction centers during thermal decomposition, are given and evaluated in detail. The nature of the thermal decomposition products has also been summarized. The available information about the role of the ammine complexes of transition metal permanganate salts in organic oxidation reactions, such as the oxidation of benzyl alcohols and regeneration of oxo-compounds from oximes and phenylhydrazones, including the kinetics of these processes, has also been collected. Their physical and chemical properties, including the thermal decomposition characteristics of known diammine (Ag(I), Cd, Zn, Cu(II), Ni(II)), triammine (Ag(I)), and simple or mixed ligand tetraammine (Cu(II), Zn, Cd, Ni(II), Co(II), Pt(II), Pd(II), Co(III)), Ru(III), pentaammine (Co(III), Cr(III), Rh(III) and Ir(III)), and hexaammine (Ni(II), Co(III), Cr(III)) complexes of transition metals with tetraoxometallate(VII) anions (M = Mn, Tc and Re), have been summarized. The preparation and properties of some special mixed ligand/anion/cation-containing complexes, such as [Ru(NH3)4(NO)(H2O)](ReO4)2, [Co(NH3)5(H2O)](ReO4)2, [Co(NH3)5X](MnO4)2 (X = Cl, Br), [Co(NH3)6]Cl2(MnO4), [Co(NH3)5ReO4]X2 (X = Cl, NO3, ClO4, ReO4), and K[Co(NH3)6]Cl2(MnO4)2, are also included.

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