Temperature dependence of the dual phosphorescence from xanthone in n-hexane matrices

S1 1A2(nπ*) and S2 1A1(ππ*) States of Jet-Cooled Xanthone

“…13,15,16 The T 1 character drastically changes with host molecules and phosphorescence from both of the 3 A 2 (nπ*) and 3 A 1 (ππ*) states can be observed simultaneously. 14 These two triplet states are strongly coupled with the vibronic interaction. The energy gap between the T 1 3 A 2 (nπ*) and S 1 1 A 2 (nπ*) states is 1131 cm -1 for the isolated xanthone molecule.…”

Anomalous Triplet Mechanism Spin Polarization Induced by the Addition of Hydrochloric Acid in the Photochemical System of Xanthone in Alcohol

“…Xn is known to show a dual phosphorescence phenomenon, − and its excited states are very sensitive to the environment. To investigate whether HCl affects the electronic excited states of Xn to invert the spin polarization or not, DTBP, which is known to be a good reducing agent in photochemical systems, is added along with HCl.…”

An FT-EPR Investigation of the Anomalous CIDEP Observed in Photoinduced Reactions of Xanthone with Alcohols in the Presence of Hydrochloric Acid

“…The spectroscopic and photochemical properties of xanthone (Xn) have been a topic of considerable interest in the past three decades. − It is well-known that the close proximity of the 3 ππ* and 3 n π* states gives rise to unique features of triplet xanthone ( 3 Xn*). For example, the character of the lowest triplet state is strongly influenced by the solvent polarity, − and 3 Xn* shows the unusual phenomenon of dual phosphorescence. − ,, Studies of photoexcited Xn have been performed with a variety of spectroscopic techniques such as transient absorption spectroscopy in the pico- and femtosecond time regions, emission spectroscopy, ,, and magnetic resonance. ,− …”

“…The spectroscopic and photochemical properties of xanthone (Xn) have been a topic of considerable interest in the past three decades. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] It is well-known that the close proximity of the 3 ππ* and 3 nπ* states gives rise to unique features of triplet xanthone ( 3 Xn*). For example, the character of the lowest triplet state is strongly influenced by the solvent polarity, [2][3][4][5][6] and 3 Xn* shows the unusual phenomenon of dual phosphorescence.…”

“…For example, the character of the lowest triplet state is strongly influenced by the solvent polarity, [2][3][4][5][6] and 3 Xn* shows the unusual phenomenon of dual phosphorescence. [1][2][3]5,6 Studies of photoexcited Xn have been performed with a variety of spectroscopic techniques such as transient absorption spectroscopy in the pico-and femtosecond time regions, 17 emission spectroscopy, 8,13,15 and magnetic resonance. 4,[9][10][11][12] In recent years, the time-resolved EPR (TREPR) technique has become a well-established method for investigating photochemical reactions and properties of photoexcited species.…”