Preparation and reaction of salts of [ZrO(O2)F2]2− and [ZrO(O2)2F3−

Bhattacharjee, Chira R.; Bhattacharjee, Manish; Chaudhuri, Mihir K.; Choudhury, S.

doi:10.1016/s0277-5387(00)83967-4

Cited by 9 publications

(2 citation statements)

References 28 publications

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“…(NH4)2[ZrO(O2)F2], with SO2(#) in an aqueous medium has also been investigated. The complexes A2[ZrO(O2)F2] (A=Na, K, NH4) have been synthesised for the first time in this laboratory (Bhattacharjee et al 1990a), which made it readily accessible for the purpose of reactivity studies. In a representative reaction, the complex (NH4)2 [ZrO(O2)F2] was allowed to react with SO2(g) in aqueous medium.…”

Section: Reactions Of A3[ti(o2)f5] (A=nh 4 K or Na) With So2(g) Or No...mentioning

confidence: 99%

Newer manifestations of reactivity of coordinated peroxide at metal and non-metal centres

Bhattacharjee

Chaudhuri

Islam

1990

Proc. Indian Acad. Sci. (Chem. Sci.)

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Newer reactions of coordinated peroxide at metal and non-metal centres are described. Reactions of peroxo-metal complexes with SOz(0), NOz(q), and C02(g) have been carried out in aqueous medium. Typically, reactions of a highly peroxygenated metal complex, A[V(Oa)3]'3H20 (A = Na, K), follow an unprecedented sequence. The deep blue ESR-silent solution of A[V(OT.)3"I-3H20 reacts to produce a yellow, ESR-inactive solution that on further reaction with the chosen substrate affords a green-blue ESR-active (cf. VO 2+) solution. The reaction proceeds through distinct steps such that, llrst, one of the coordinated peroxides undergoes a two-electron irreversible cleavage of the O-O bond leading to a diperoxy-mono(sniphato)vanadate(V) intermediate, 1(O2)2V-O-SO3]-, that readily undergoes hydrolysis to produce H2SO 4 and an aquaoxo-diperoxovanadate(V) complex, [VO(O2)2H20 ] -. The latter complex reacts with more SO2(0) causing reduction of vanadium (V) to vanadium (IV) and conversion of coordinated peroxide to coordinated sulphate producing the b/s(sulphato)vanadyl complex, [VO(SO4)2(H,O)s]'-.Further, the reaction of A[V(Oz)3]-3H20 with SO2(g ) in the presence of AF, yielding a ternary fluoro(sulphato)oxovanadate (IV) complex AJ~VO(SO4)2F2(H20)]'2H20, serves as a paradigm for the synthesis of ternary complexes of vanadyl, VO 2+. It is also evident interalia that the [V(O2)3]-species offers potential as a novel synthon. Some recent developments in the peroxo-chemistry of B, C, P and As are highlighted. Heretofore unreported salts of peroxo phosphoric acid, viz. (NHt)sI'PO3(O2)]-3H20 and Na3[PO3(O2)]'3H20, have been synthesized and their potential as oxidants explored. Their role in oxidising organic substances is highlighted, especially as a substitute for the alkaline-HzO 2 reagent. Keywerds. Peroxo-metal and non-metal compounds; reactivity in aqueous media; substitute for the basic-H2Oz reagent.

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Section: Reactions Of A3[ti(o2)f5] (A=nh 4 K or Na) With So2(g) Or No...mentioning

confidence: 99%

Newer manifestations of reactivity of coordinated peroxide at metal and non-metal centres

Bhattacharjee

Chaudhuri

Islam

1990

Proc. Indian Acad. Sci. (Chem. Sci.)

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“…For example, p = 1 for a system of collapsing cosmic string loops [4,5] as well as for a system of collapsing monopolonia [2,7], while p = 0 for a system of saturated superconducting cosmic string loops [3]. We shall see below that the observed UHE CR flux gives an upper limit to the possible value of « for any given value of p.…”

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confidence: 93%

Grand Unified Theories, Topological Defects, and Ultrahigh-Energy Cosmic Rays

Bhattacharjee

Hill

Schramm

1996

The Big Bang and Other Explosions in Nuclear and Particle Astrophysics

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The ultrahigh-energy (UHE) proton and neutrino spectra resulting from collapse or annihilations of topological defects surviving from the GUT era are calculated. Irrespective of the specific process under consideration (which determines the overall normalization of the spectrum), the UHE proton spectrum always 'recovers' at ~ 1.8 x 10 11 GeV after a partial Greisen-Zatsepin-Kuz'min 'cutoff' at ~ 5 x 10 10 GeV and continues to a GUT-scale energy with a universal shape determined by the physics of hadronic jet fragmentation. Implications of our results are discussed. Topological defects [l], e.g., monopoles, cosmic strings, domain walls, superconducting cosmic strings, etc., and various possible hybrid objects made of these, are likely to have i been formed in symmetry-breaking phase transitions in the early universe. Because of their topological stability the defects can survive indefinitely, until and unless physically destroyed due to collapse, annihilations or other reasons[2-5). When topological defects are destroyed the energy trapped in them is released in the form of massive quanta (hereafter generically referred to as X particles) of the various fields (gauge bosons, biggs bosons, superheavy fermions) that 'constitute' the defects. The X-particles can then decay into known quarks, gluons, leptons, etc, which ultimately materialize into, among other particles, nucleons, gamma rays and neutrinos with energies up to ~ m x , the mass of the X-particles released from the defects. If the defects were originally formed in a phase transition at the GUT-scale ~ 10 16 GeV, then we have here a possible natural mechanism of production of ultrahigh-energy (UHE) cosmic ray (CR) particles up to an energy of this order, without any acceleration mechanism. Below we give a general calculation of the expected evolved proton as well as neutrino spectra resulting from this kind of processes.We assume a fio = 1 "flat" universe and a Hubble constant HQ = 100.h Km.s~1.Mpc~l, with h = 0.75 throughout.The rate of release of X-particles due to destruction of topological defects can, in general, be effectively expressed in terms of two fundamental parameters entering in the problem, namely, the mass scale m x and the Hubble time ~ t, in the form (with ft = c = 'XV^t j( 1) where K and p are dimensionless constants whose values depend on the specific process involving specific kind of topological defect, (the 'amplitude' K may, in general, depend on p), and n x (t,-) denotes the number density of the X-particles released at the time t{. For example, p = 1 for a system of collapsing cosmic string loops [4,5] as well as for a system of collapsing monopolonia [2,7], while p = 0 for a system of saturated superconducting cosmic 2 string loops [3]. We shall see below that the observed UHE CR flux gives an upper limit to the possible value of « for any given value of p.We assume that each X decays into a quark and a lepton each carrying an energy m x J2.The quarks fragment and produce jets of hadrons. We use the following hadronic fr...

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Applications in Coordination Chemistry

Nakamoto

2008

Infrared and Raman Spectra of Inorganic and Coordination Compounds

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Preparation and reaction of salts of [ZrO(O2)F2]2− and [ZrO(O2)2F3−

Cited by 9 publications

References 28 publications

Newer manifestations of reactivity of coordinated peroxide at metal and non-metal centres

Newer manifestations of reactivity of coordinated peroxide at metal and non-metal centres

Grand Unified Theories, Topological Defects, and Ultrahigh-Energy Cosmic Rays

Applications in Coordination Chemistry

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