Luminescence of the Mn2+ ion in non-O-h and T-d coordination environments: the missing case of square pyramid

Luminescence of the Mn2+ ion in non-O-h and T-d coordination environments: the missing case of square pyramid Full article

Journal

Dalton Transactions
ISSN: 1477-9226 , E-ISSN: 1477-9234

Output data

Year: 2019, Volume: 48, Number: 43, Pages: 16448-16456 Pages count : 9 DOI: 10.1039/c9dt03283e

Authors

Artem'ev Alexander, V ^1,2 , Davydova Maria P. ² , Berezin Alexey S. ^1,2 , Brel Valery K. ³ , Morgalyuk Vasilii P. ³ , Bagryanskaya Irina Yu ^2,4 , Samsonenko Denis G. ^1,2

Affiliations

1	(Данные Web of science) Russian Acad Sci, Nikolaev Inst Inorgan Chem, Siberian Branch, 3 Acad Lavrentiev Ave, Novosibirsk 630090, Russia
2	(Данные Web of science) Novosibirsk State Univ, 2 Pirogova Str, Novosibirsk 630090, Russia
3	(Данные Web of science) Russian Acad Sci, AN Nesmeyanov Inst Organoelement Cpds, 28 Vavilova Str, Moscow 119991, Russia
4	(Данные Web of science) Russian Acad Sci, NN Vorozhtsov Novosibirsk Inst Organ Chem, Siberian Branch, 9 Acad Lavrentiev Ave, Novosibirsk 630090, Russia

The first observation of luminescence for Mn(ii) complexes with a square-pyramidal geometry (C-4v) of the metal is reported. The complexes of such type, namely [Mn(L)(2)Hal]X, where L is an O,O ' -chelating ligand Me2N-CH(Ph2P?O)(2), Hal = Cl or Br, and X = Br, I or [MnCl4], show at ambient temperature red photoluminescence (lambda emmax approximate to 620 nm) with millisecond lifetimes (3.8-7.6 ms). This emission, stemming from spin-forbidden E-4(G) -> (6)A(1)(S) transitions in square-pyramidally coordinated Mn2+, is found to be responsive to temperature. Upon cooling the complexes from 300 to 77 K, the red-shift of the emission band by approximate to 20 nm takes place, which is accompanied by the increase of its integral intensity and lifetime. The peculiarities of the discovered Mn2+(C-4v) luminescence are discussed against the classical luminescence that occurs in octahedral (O-h) and tetrahedral (T-d) surroundings.

Artem'ev A.V. , Davydova M.P. , Berezin A.S. , Brel V.K. , Morgalyuk V.P. , Bagryanskaya I.Y. , Samsonenko D.G.
Luminescence of the Mn2+ ion in non-O-h and T-d coordination environments: the missing case of square pyramid
Dalton Transactions. 2019. V.48. N43. P.16448-16456. DOI: 10.1039/c9dt03283e WOS Scopus РИНЦ

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