Osmium-(V), -(IV) and -(III) complexes with tetradentate dianionic chelating ligands

Wing Kin Cheng; Kwok Yin Wong; Wai Fong Tong; Ting Fong Lai; Chi Ming Che

doi:10.1039/DT9920000091

Osmium-(V), -(IV) and -(III) complexes with tetradentate dianionic chelating ligands

Wing Kin Cheng, Kwok Yin Wong, Wai Fong Tong, Ting Fong Lai, Chi Ming Che

Research output: Journal article publication › Journal article › Academic research › peer-review

17 Citations (Scopus)

Abstract

Osmium-(III) and -(IV) complexes of the ligands salen [H2salen = ethylenebis(salicylidineimine)], bpb [H2bpb = 1,2-bis(pyridine-2-carboxamido)benzene] and bpc [H2bpc = 4,5-dichloro-1,2-bis(pyridine-2-carboxamido)benzene] were synthesised by reducing the corresponding trans-dioxoosmium(VI) complexes with PPh3. The structure of [OsIV(salen)(OPri)2] has been determined by X-ray crystallography: monoclinic, space group C2/c (no. 15), a = 15.367(2), b = 7.847(1), c = 17.999(2) Å, β = 95.36(1)° and Z = 4. Electrochemical studies of trans-dialkoxyoosmium(IV) complexes in acetonitrile showed a reversible oxidation wave assignable to the oxidation of OsIV to OsV. Some trans-dialkoxyoosmium(V) complexes were characterised by UV/VIS spectroscopy. The osmium(III) complexes of salen, bpb and bpc were found to catalyse the oxidation of alkenes by iodosylbenzene.

Original language	English
Pages (from-to)	91-96
Number of pages	6
Journal	Journal of the Chemical Society, Dalton Transactions
Issue number	1
DOIs	https://doi.org/10.1039/DT9920000091
Publication status	Published - 1 Dec 1992
Externally published	Yes

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General Chemistry

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10.1039/DT9920000091

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title = "Osmium-(V), -(IV) and -(III) complexes with tetradentate dianionic chelating ligands",

abstract = "Osmium-(III) and -(IV) complexes of the ligands salen [H2salen = ethylenebis(salicylidineimine)], bpb [H2bpb = 1,2-bis(pyridine-2-carboxamido)benzene] and bpc [H2bpc = 4,5-dichloro-1,2-bis(pyridine-2-carboxamido)benzene] were synthesised by reducing the corresponding trans-dioxoosmium(VI) complexes with PPh3. The structure of [OsIV(salen)(OPri)2] has been determined by X-ray crystallography: monoclinic, space group C2/c (no. 15), a = 15.367(2), b = 7.847(1), c = 17.999(2) {\AA}, β = 95.36(1)° and Z = 4. Electrochemical studies of trans-dialkoxyoosmium(IV) complexes in acetonitrile showed a reversible oxidation wave assignable to the oxidation of OsIV to OsV. Some trans-dialkoxyoosmium(V) complexes were characterised by UV/VIS spectroscopy. The osmium(III) complexes of salen, bpb and bpc were found to catalyse the oxidation of alkenes by iodosylbenzene.",

author = "Cheng, {Wing Kin} and Wong, {Kwok Yin} and Tong, {Wai Fong} and Lai, {Ting Fong} and Che, {Chi Ming}",

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T1 - Osmium-(V), -(IV) and -(III) complexes with tetradentate dianionic chelating ligands

AU - Cheng, Wing Kin

AU - Wong, Kwok Yin

AU - Tong, Wai Fong

AU - Lai, Ting Fong

AU - Che, Chi Ming

PY - 1992/12/1

Y1 - 1992/12/1

N2 - Osmium-(III) and -(IV) complexes of the ligands salen [H2salen = ethylenebis(salicylidineimine)], bpb [H2bpb = 1,2-bis(pyridine-2-carboxamido)benzene] and bpc [H2bpc = 4,5-dichloro-1,2-bis(pyridine-2-carboxamido)benzene] were synthesised by reducing the corresponding trans-dioxoosmium(VI) complexes with PPh3. The structure of [OsIV(salen)(OPri)2] has been determined by X-ray crystallography: monoclinic, space group C2/c (no. 15), a = 15.367(2), b = 7.847(1), c = 17.999(2) Å, β = 95.36(1)° and Z = 4. Electrochemical studies of trans-dialkoxyoosmium(IV) complexes in acetonitrile showed a reversible oxidation wave assignable to the oxidation of OsIV to OsV. Some trans-dialkoxyoosmium(V) complexes were characterised by UV/VIS spectroscopy. The osmium(III) complexes of salen, bpb and bpc were found to catalyse the oxidation of alkenes by iodosylbenzene.

AB - Osmium-(III) and -(IV) complexes of the ligands salen [H2salen = ethylenebis(salicylidineimine)], bpb [H2bpb = 1,2-bis(pyridine-2-carboxamido)benzene] and bpc [H2bpc = 4,5-dichloro-1,2-bis(pyridine-2-carboxamido)benzene] were synthesised by reducing the corresponding trans-dioxoosmium(VI) complexes with PPh3. The structure of [OsIV(salen)(OPri)2] has been determined by X-ray crystallography: monoclinic, space group C2/c (no. 15), a = 15.367(2), b = 7.847(1), c = 17.999(2) Å, β = 95.36(1)° and Z = 4. Electrochemical studies of trans-dialkoxyoosmium(IV) complexes in acetonitrile showed a reversible oxidation wave assignable to the oxidation of OsIV to OsV. Some trans-dialkoxyoosmium(V) complexes were characterised by UV/VIS spectroscopy. The osmium(III) complexes of salen, bpb and bpc were found to catalyse the oxidation of alkenes by iodosylbenzene.

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DO - 10.1039/DT9920000091

M3 - Journal article

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JF - Journal of the Chemical Society, Dalton Transactions

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Osmium-(V), -(IV) and -(III) complexes with tetradentate dianionic chelating ligands

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