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• W2525672223 endingPage "8308" @default.
• W2525672223 startingPage "8297" @default.
• W2525672223 abstract "Flavins are a fundamental class of biomolecules, whose photochemical properties strongly depend on their environment and their redox and metalation state. Infrared multiphoton dissociation (IRMPD) spectra of mass-selected isolated metal–lumiflavin ionic complexes (M+LF) are analyzed in the fingerprint range (800–1830 cm–1) to determine the bonding of lumiflavin with alkali (M = Li, Na, K, Cs) and coinage (M = Cu, Ag) metal ions. The complexes are generated in an electrospray ionization source coupled to an ion cyclotron resonance mass spectrometer and the IR free electron laser FELIX. Vibrational and isomer assignments of the IRMPD spectra are accomplished by comparison to quantum chemical calculations at the B3LYP/cc-pVDZ level, yielding structure, binding energy, bonding mechanism, and spectral properties of the complexes. The most stable binding sites identified in the experiments involve metal bonding to the oxygen atoms of the two available CO groups of LF. Hence, CO stretching frequencies are a sensitive indicator of both the metal binding site and the metal bond strength. More than one isomer is observed for M = Li, Na, and K, and the preferred CO binding site changes with the size of the alkali ion. For Cs+LF, only one isomer is identified, although the energies of the two most stable structures differ by less than 7 kJ/mol. While the M+–LF bonds for alkali ions are mainly based on electrostatic forces, substantial covalent contributions lead to stronger bonds for the coinage metal ions. Comparison between lumiflavin and lumichrome reveals substantial differences in the metal binding motifs and interactions due to the different flavin structures." @default.
• W2525672223 created "2016-10-07" @default.
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• W2525672223 date "2016-10-13" @default.
• W2525672223 modified "2023-09-30" @default.
• W2525672223 title "IRMPD Spectroscopy of Metalated Flavins: Structure and Bonding of Lumiflavin Complexes with Alkali and Coinage Metal Ions" @default.
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• W2525672223 doi "https://doi.org/10.1021/acs.jpca.6b08281" @default.
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