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Volumn 127, Issue 8, 2005, Pages 2553-2564

Temperature-induced switching of the mechanism for intramolecular energy transfer in a 2,2′:6′,2″-terpyridine-based Ru(II)-Os(II) trinuclear array

Author keywords

[No Author keywords available]

Indexed keywords

ARRAYS; CHARGE TRANSFER; ENERGY TRANSFER; GROUND STATE; PROBABILITY; SYNTHESIS (CHEMICAL); THERMAL EFFECTS;

EID: 14744280814     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja044097r     Document Type: Article
Times cited : (81)

References (99)
  • 48
    • 14744270335 scopus 로고    scopus 로고
    • note
    • Although triplet-triplet energy transfer can occur over relatively long distances (e.g., 50 Å), it is necessary that this process competes effectively with nonradiative decay of the excited state. The triplet lifetime of the Ruterpy reference compound is only 25 ns, and it is well established that the rate of electron exchange decreases exponentially with increasing separation.
  • 77
    • 14744274689 scopus 로고    scopus 로고
    • note
    • According to the measured reduction potentials and triplet energy, light-induced electron transfer to (ΔG° = +0.62 eV) or from (ΔG° = +0.30 eV) the triplet state of the Ru-terpy unit is unlikely to compete with nonradiative decay of the excited state.
  • 78
    • 14744268689 scopus 로고    scopus 로고
    • note
    • Long-range triplet energy transfer can be equated to simultaneous transfer of an electron and a positive hole for which the activation energy can be derived from classical Marcus theory. Since the driving force and the reorganization energy are of comparable magnitude, it follows that the reaction should be weakly activated.
  • 94
    • 14744268794 scopus 로고    scopus 로고
    • note
    • It seems likely that restricted rotation around the central biphenylene group will prevent this unit from acting as the electron donor. Instead, each phenylene ring is expected to donate charge to the nearest terpyridine ligand. Since the reduction potentials for Os-terpy and Ru-terpy are closely comparable, the latter situation would give rise to two CT states of similar energy and geometry. Energy migration between these triplets should be fast.
  • 98
    • 14744273535 scopus 로고    scopus 로고
    • note
    • LUM, with both rate constant and lifetime being measured at a given temperature.
  • 99
    • 14744279656 scopus 로고    scopus 로고
    • note
    • This possibility stems from the likelihood that fast energy migration could occur between isoenergetic CT states, followed by trapping at a low-energy acceptor.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.