The H-phosphinate 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) acts as O-donor ligand towards manganese(II) and zinc(II) halides, with the formation of tetrahedral complexes having general formula [MX2(DOPO)2] (M = Mn, X = Cl, Br, I; M = Zn, X = Br). The structure of [ZnBr2(DOPO)2] was ascertained by single-crystal X-ray diffraction. All the compounds showed appreciable photoluminescence at the solid state, with an emission band in the red region of the spectrum attributed to radiative decay from triplet states of the coordinated DOPO ligands. Such an emission is superimposed to the 4T1(4G)→6A1(6S) transition around 530–540 nm in the case of the Mn(II) derivatives and to a fluorescent band centred at 380 nm for [ZnBr2(DOPO)2]. Excitation wavelength-dependent emission was observed for [MnCl2(DOPO)2] and [MnBr2(DOPO)2]. The absorption and emission features of the coordinated DOPO ligands were rationalized by means of TD-DFT calculations.

Dual-emitting Mn(II) and Zn(II) halide complexes with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide as ligand

Ferraro, Valentina;Agostinis, Lodovico;Bortoluzzi, Marco
2023-01-01

Abstract

The H-phosphinate 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) acts as O-donor ligand towards manganese(II) and zinc(II) halides, with the formation of tetrahedral complexes having general formula [MX2(DOPO)2] (M = Mn, X = Cl, Br, I; M = Zn, X = Br). The structure of [ZnBr2(DOPO)2] was ascertained by single-crystal X-ray diffraction. All the compounds showed appreciable photoluminescence at the solid state, with an emission band in the red region of the spectrum attributed to radiative decay from triplet states of the coordinated DOPO ligands. Such an emission is superimposed to the 4T1(4G)→6A1(6S) transition around 530–540 nm in the case of the Mn(II) derivatives and to a fluorescent band centred at 380 nm for [ZnBr2(DOPO)2]. Excitation wavelength-dependent emission was observed for [MnCl2(DOPO)2] and [MnBr2(DOPO)2]. The absorption and emission features of the coordinated DOPO ligands were rationalized by means of TD-DFT calculations.
2023
545
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in ARCA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10278/5007740
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 8
  • ???jsp.display-item.citation.isi??? 8
social impact