Extrinsic Heavy Metal Atom Effect on the Solid-State Room Temperature Phosphorescence of Cyclic Triimidazole
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CARIATI, Elena; FORNI, Alessandra; LUCENTI, Elena; MARINOTTO, D.; PREVITALI, A.; RIGHETTO, S.; BOTTA, C.; BOLD, Victor; KRAVTSOV, Viktor; FONARI, Marina. Extrinsic Heavy Metal Atom Effect on the Solid-State Room Temperature Phosphorescence of Cyclic Triimidazole. In: Chemistry - An Asian Journal. 2019, nr. 6(14), pp. 853-858. ISSN 1861-4728.
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Chemistry - An Asian Journal
Numărul 6(14) / 2019 / ISSN 1861-4728

Extrinsic Heavy Metal Atom Effect on the Solid-State Room Temperature Phosphorescence of Cyclic Triimidazole


DOI: 10.1002/asia.201801604
Pag. 853-858

Cariati Elena12, Forni Alessandra2, Lucenti Elena2, Marinotto D.2, Previtali A.1, Righetto S.12, Botta C.2, Bold Victor3, Kravtsov Viktor3, Fonari Marina3
 
1 Universitatea din Milano, Italia,
2 ISTM-CNR, Istituto di Scienze e Tecnologie Molecolari,
3 Institute of Applied Physics
 
Disponibil în IBN: 23 aprilie 2019


Rezumat

Four coordination compounds [Zn 3 (CH 3 COO) 6 (H 2 O) 2 ](TT) 2 [Cd(H 2 O) 6 ](ClO 4 ) 2 (TT) 2 , [Cd(H 2 O) 6 ](BF 4 ) 2 (TT) 2 , [Zn(H 2 O) 6 ](BF 4 ) 2 (TT) 2 (1–4) accommodating the crystallization induced emissive triimidazo[1,2-a:1′,2′-c:1′′,2′′-e][1,3,5]triazine (TT) as a guest in their crystal lattice are isolated and fully photophysically and structurally characterized. Their emission properties are compared with those of afterglow TT and interpreted taking into account the heavy atom effect and crystal packing similarities and differences. In the case of 1, due to the closeness of the TT H-aggregates arrangement with that of the phosphor's pure phase, the observed intensification of the phosphorescent emission at the expense of the prompt one is attributed to the extrinsic heavy atom effect of Zn. In 2 and 3, the heavier Cd atom is responsible for a decrease in the lifetimes of the afterglow emission, despite the presence of tightly overlapped H-dimers in the crystal structure. Finally, for 4, isostructural with 3, the Zn atom reveals in RTUP lifetime comparable with that of 1.

Cuvinte-cheie
extrinsic heavy atom effect, H aggregates, room temperature ultralong phosphorescence, single crystal XRD, time resolved photoluminescence