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Proof against 2′-hydroxy-3-prenylflavone-oxygen complex by laser desorption/ionization time-of-flight mass spectrometry

✍ Scribed by Toshio Fukai; Taro Nomura

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
116 KB
Volume
12
Category
Article
ISSN
0951-4198

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✦ Synopsis

Photo

-oxidative cyclization of 2'-hydroxy-3-prenylflavones has been examined using laser desorption/ ionization time-of-flight (LDI-TOF) mass spectrometry. The LDI-TOF mass spectrum of an amorphous solid of morusin gave the oxide ions [M OH] and [M O 2 H] . On the other hand, the oxide ions could not be detected in the LDI-TOF mass spectrum of crystalline morusin. The observation of the oxide ions is proof against the presence of an oxygen pocket on the molecule of morusin in the amorphous solid state. The oxygen pocket may correspond to a contact-charge transfer complex [morusin …… O 2 ] in the ground state of morusin in a solution which was postulated earlier in the photoreaction mechanism of the flavone.

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