Photophysical properties of the fullerenes, C60 and C70

Palit, Dipak K.; Sapre, A. V.; Mittal, Jai P.; Rao, C. N. R.

doi:10.1016/0009-2614(92)85900-u

Cited by 128 publications

(87 citation statements)

References 21 publications

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“…(370 nm), a,,= 1.9 x lo-' (405 nm)] have also been reported [12]. Other groups, however, reported excitation wavelength-independent singlet state lifetimes (for 265, 355 and 532 nm excitation), QT = 1 (for 248, 337 and 351 nm excitation) [7] and @(IO,) = 1 (340 and 530 nm excitation) for Cso [13].…”

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“…Recent literature led to some contradiction on this point regarding both C, and C,,,. Some groups have reported excitation wavelength-dependent singlet oxygen quantum yields using [7] and @(IO,) = 1 (340 and 530 nm excitation) for Cso [13].While it had been reported that C, also shows an excitation wavelength-dependent fluorescence quantum yield [Q= 6 X 10m5 (370 nm), @)R = 1.3 X 1O-4 (378 nm) and cP,= 2.2 x 10m4 (471 nm)] [12,14], and thus does not obey Kasha-Vavilov's rule, this has been convincingly contradicted by using time resolved photoacoustic calorimetry (@,=0.97 for 337,4&t and 510 nm excitation) [ll], transient absorption (@r= 1 for 248, 337 and 351 nm excitation [7] and by careful correction of the fluorescence excitation spectrum [9].In a recent report [ll] it was concluded on the basis of the available data for C, and C,,, that: "it appears that Co, in contrast to C,, obeys Kasha's rule and relaxes efficiently to 4 from higher S,,".In 1950 Kasha stated that in most aromatic molecules emission occurs from the lowest excited electronic state of a given multiplicity (i.e. from S, or T,), the most well known exception being azulene which shows fluorescence from 5,.…”

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“…While it had been reported that C, also shows an excitation wavelength-dependent fluorescence quantum yield [Q= 6 X 10m5 (370 nm), @)R = 1.3 X 1O-4 (378 nm) and cP,= 2.2 x 10m4 (471 nm)] [12,14], and thus does not obey Kasha-Vavilov's rule, this has been convincingly contradicted by using time resolved photoacoustic calorimetry (@,=0.97 for 337,4&t and 510 nm excitation) [ll], transient absorption (@r= 1 for 248, 337 and 351 nm excitation [7] and by careful correction of the fluorescence excitation spectrum [9].…”

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On the applicability of the Kasha—Vavilov rule to C60

Williams

Verhoeven

1994

Spectrochimica Acta Part A: Molecular Spectroscopy

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On the applicability of the Kasha-Vavilov Rule to C-60Williams, R.M.; Verhoeven, J.W. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Ah&act-Via full correction for the instrumental response function, the fluorescence excitation spectrum of C, in methylcyclohexane between 240 and 580 nm is shown to match the absorption spectrum. This proves that, in contrast to earlier reports, also after UV excitation into higher S, states, deactivation proceeds virtually completely via the S, state, in accordance with the Kasha-Vavilov rule.DURING recently emerging investigations regarding the photophysical properties of C, and G, different research groups have occasionally reported data that cannot be reconciled. A topical example is provided by the scatter in the reported singlet excited state lifetimes for both Gt and C& The topic we would like to discuss here, however, is whether Cm and Cm undergo significant deactivation avoiding the S1 state after UV excitation into higher singlet excited states. Recent literature led to some contradiction on this point regarding both C, and C,,,. Some groups have reported excitation wavelength-dependent singlet oxygen quantum yields using [7] and @(IO,) = 1 (340 and 530 nm excitation) for Cso [13].While it had been reported that C, also shows an excitation wavelength-dependent fluorescence quantum yield [Q= 6 X 10m5 (370 nm), @)R = 1.3 X 1O-4 (378 nm) and cP,= 2.2 x 10m4 (471 nm)] [12,14], and thus does not obey Kasha-Vavilov's rule, this has been convincingly contradicted by using time resolved photoacoustic calorimetry (@,=0.97 for 337,4&t and 510 nm excitation) [ll], transient absorption (@r= 1 for 248, 337 and 351 nm excitation [7] and by careful correction of the fluorescence excitation spectrum [9].In a recent report [ll] it was concluded on the basis of the available data for C, and C,,, that: "it appears that Co, in contrast to C,, obeys Kasha's rule and relaxes efficiently to 4 from higher S,,".In 1950 Kasha stated that in most aromatic molecules emission occurs from the lowest excited electronic state of a given multiplicity (i.e. from S, or T,), the most well known exception being azulene which shows fluorescence from 5,.The statement that fluorescence quantum efficiency is independent of the excitation wavelength (for non-...

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On the applicability of the Kasha—Vavilov rule to C60

Williams

Verhoeven

1994

Spectrochimica Acta Part A: Molecular Spectroscopy

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“…One of the most exciting properties of fullerene chemistry is related to their excited-state properties [10,11]. The most abundant representative of the family C 60 can be identified via its strong absorptions between 190 and 410 nm (allowed 1 T 1u -1 A g ) as well as by some pale but significant transitions in the 410 and 620 nm (orbital forbidden singlet-singlet) region which is responsible for the purple color of C 60 and the red color of C 70 [12,13].…”

Section: Optical Studies Of Fullerenementioning

confidence: 99%

Fullerene as Spin Converter

Okutan¹

2018

Fullerenes and Relative Materials - Properties and Applications

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It has now been more than 30 years since buckminsterfullerene became a real thing. An exclusive field of study called fullerene chemistry arises and is discovered to be unique in many respects. In a very short time, a great deal of effort has been devoted on the fullerene chemistry and properties of fullerene derivatives. The fields of fullerene and light-induced processes considerably overlapped, and now numerous wonderful examples are on exhibition. The large number of these systems has been designed to take advantage of the electron-accepting property of fullerene and broadcasts the fullerenes as universal spin converter advertising its perfect intersystem crossing (ISC) quantum yield where a spin converter can be identified as a chromophore that undergoes efficient ISC with a low first excited state (S 1 ), but does not necessarily strongly harvest visible light. Thus, donoracceptor systems in the field of light-induced processes within multicomponent fullerene arrays have been proposed as models for optical limiters, owing to the singlet oxygen production efficiency of C 60 and the C 60 derivatives in the field of medicinal chemistry.

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