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Complex [Pt(iPr2pipdt)(Quinoxdt)](iPr2pipdt=1,4-diisopropyl-piperazine-2,3-dithione;Quinoxdt=[1,4]dithii-no[2,3-b]quinoxaline-2,3-dithiolate) exhibitsaremarkablegreenemission at 570 nm (roomtemperature),whichisabovethelowestexcitedstate.Thecomplexischaracterizedby negativesolvatochromismas well as ahigh second-orderpolarizability.Additionof AgIionsinduces1) hypsochromicshiftof the lowestfrequenciesand 2) reversible quenchingof luminescence. The corresponding Ni andPd complexeshavealso beenprepared and investigatedto assistinterpre-tationof opticalproperties withinthe triad.Computationalstudies basedon DFT and time-dependent DFT highlighttheelectronicpropertiesof [Pt(iPr2pipdt)(Quinoxdt)].The prefer-entialsite of interaction between the Pt complex and incom-ingAgIisevidencedbytheshapeoftheFukuifunctions,pointingtothe thiolicsulfurandplatinumatomsas themostreactivesitestowardsasoft cation.Calculatedopticalproperties are in agreementwithexperimental findings. Thisstudyshedslighton the structure–property relationship forthis classof compounds.
Uncommon Optical Properties and Silver-responsive Turn-off/on Luminescence in a Pt(II) heteroleptic dithiolene complex / S.S. Attar, F. Artizzu, L. Marchiò, D. Espa, L. Pilia, M.F. Casula, A. Serpe, M. Pizzotti, A. Orbelli Biroli, P. Deplano. - In: CHEMISTRY-A EUROPEAN JOURNAL. - ISSN 0947-6539. - 24:41(2018 Jul 20), pp. 10503-10512.
Uncommon Optical Properties and Silver-responsive Turn-off/on Luminescence in a Pt(II) heteroleptic dithiolene complex
M. PizzottiMembro del Collaboration Group
;A. Orbelli BiroliPenultimo
Membro del Collaboration Group
;
2018
Abstract
Complex [Pt(iPr2pipdt)(Quinoxdt)](iPr2pipdt=1,4-diisopropyl-piperazine-2,3-dithione;Quinoxdt=[1,4]dithii-no[2,3-b]quinoxaline-2,3-dithiolate) exhibitsaremarkablegreenemission at 570 nm (roomtemperature),whichisabovethelowestexcitedstate.Thecomplexischaracterizedby negativesolvatochromismas well as ahigh second-orderpolarizability.Additionof AgIionsinduces1) hypsochromicshiftof the lowestfrequenciesand 2) reversible quenchingof luminescence. The corresponding Ni andPd complexeshavealso beenprepared and investigatedto assistinterpre-tationof opticalproperties withinthe triad.Computationalstudies basedon DFT and time-dependent DFT highlighttheelectronicpropertiesof [Pt(iPr2pipdt)(Quinoxdt)].The prefer-entialsite of interaction between the Pt complex and incom-ingAgIisevidencedbytheshapeoftheFukuifunctions,pointingtothe thiolicsulfurandplatinumatomsas themostreactivesitestowardsasoft cation.Calculatedopticalproperties are in agreementwithexperimental findings. Thisstudyshedslighton the structure–property relationship forthis classof compounds.
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