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Ligation will modulate these IPs, but few gas-phase studies have examine the influence of anionic ligands: (a) McCullough, S. M.; Jones, A. D.; Lebrilla, C. B. Int. J. Mass Spectrom. Ion Processes 1991, 107, 545-552. (b) Dai, P.; McCullough-Catalano, S.; Bolton, M.; Jones, A. D.; Lebrilla, C. B. Int. J. Mass Spectrom. Ion Processes 1995, 144, 67-77. (c) Schroder, D.; Barsch, S.; Schwarz, H. Int. J. Mass Spectrom. 1999, 192, 125-139. (d) Schroeder, D.; Baersch, S.; Schwarz, H. J. Phys. Chem. A 2000, 104, 5101-5110.
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Ligation will modulate these IPs, but few gas-phase studies have examine the influence of anionic ligands: (a) McCullough, S. M.; Jones, A. D.; Lebrilla, C. B. Int. J. Mass Spectrom. Ion Processes 1991, 107, 545-552. (b) Dai, P.; McCullough-Catalano, S.; Bolton, M.; Jones, A. D.; Lebrilla, C. B. Int. J. Mass Spectrom. Ion Processes 1995, 144, 67-77. (c) Schroder, D.; Barsch, S.; Schwarz, H. Int. J. Mass Spectrom. 1999, 192, 125-139. (d) Schroeder, D.; Baersch, S.; Schwarz, H. J. Phys. Chem. A 2000, 104, 5101-5110.
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The gas-phase coordination chemistry of metal-salen complexes has been examined: Chromium(III)-salen complexes can coordinate an additional two ligands: Kumar, M. K.; Prabhakar, S.; Kumar, M. R.; Reddy, T. J.; Premsingh, S.; Rajagopal, S.; Vairamani, M. Rapid Commun. Mass Spectrom. 2004, 18, 1103-1108. Manganese(III)-salen complexes coordinate a single additional ligand: Plattner, D. A.; Feichtinger, D.; El-Bahraoui, J.; Wiest, O. Int. J. Mass Spectrom. 2000, 195/196, 351-362.
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Vairamani, M.7
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The gas-phase coordination chemistry of metal-salen complexes has been examined: Chromium(III)-salen complexes can coordinate an additional two ligands: Kumar, M. K.; Prabhakar, S.; Kumar, M. R.; Reddy, T. J.; Premsingh, S.; Rajagopal, S.; Vairamani, M. Rapid Commun. Mass Spectrom. 2004, 18, 1103-1108. Manganese(III)-salen complexes coordinate a single additional ligand: Plattner, D. A.; Feichtinger, D.; El-Bahraoui, J.; Wiest, O. Int. J. Mass Spectrom. 2000, 195/196, 351-362.
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The condensed phase coordination environment of transition metal salen complexes is quite diverse and can depend on the structures of the ancillary ligand(s). For reviews, see: (a) Calligaris, M.; Nardin, G.; Randaccio, L. Coord. Chem. Rev. 1972, 7, 385-403. (b) Yamada, S. Coord. Chem. Rev. 1999, 190-192, 537-555. Hobday, M. D.; Smith, T. D. Coord. Chem. Rev. 1973, 9, 311-337.
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The condensed phase coordination environment of transition metal salen complexes is quite diverse and can depend on the structures of the ancillary ligand(s). For reviews, see: (a) Calligaris, M.; Nardin, G.; Randaccio, L. Coord. Chem. Rev. 1972, 7, 385-403. (b) Yamada, S. Coord. Chem. Rev. 1999, 190-192, 537-555. Hobday, M. D.; Smith, T. D. Coord. Chem. Rev. 1973, 9, 311-337.
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The condensed phase coordination environment of transition metal salen complexes is quite diverse and can depend on the structures of the ancillary ligand(s). For reviews, see: (a) Calligaris, M.; Nardin, G.; Randaccio, L. Coord. Chem. Rev. 1972, 7, 385-403. (b) Yamada, S. Coord. Chem. Rev. 1999, 190-192, 537-555. Hobday, M. D.; Smith, T. D. Coord. Chem. Rev. 1973, 9, 311-337.
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Unfortunately, the gas phase thermochemistry associated with the dissociation reactions of these complexes is unknown. Their solution phase electrochemistry is of limited value in making gas phase predictions on IPs, since they are dependent on both the solvent and the coordinating ligand. (a) for Co systems, see: Eichhorn, E.; Rieker, A.; Speiser, B. Angew. Chem. Int. Ed. Engl. 1992, 31, 1215-1217. (b) For Fe systems, see: (b) Ranchet, D.; Tommasino, J. B.; Vittori, O.; Fabre, P. L. J. Sol. Chem. 1998, 27, 979-992. Co-R bond dissociation energies of salen complexes are significantly effected by the nature of the trans ligand: (c) Li, G.; Zhang, F. F.; Chen, H.; Yin, H. F.; Chen, H. L.; Zhang, S. Y. Dalton Trans. 2002, 105-110.
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0032263515
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Unfortunately, the gas phase thermochemistry associated with the dissociation reactions of these complexes is unknown. Their solution phase electrochemistry is of limited value in making gas phase predictions on IPs, since they are dependent on both the solvent and the coordinating ligand. (a) for Co systems, see: Eichhorn, E.; Rieker, A.; Speiser, B. Angew. Chem. Int. Ed. Engl. 1992, 31, 1215-1217. (b) For Fe systems, see: (b) Ranchet, D.; Tommasino, J. B.; Vittori, O.; Fabre, P. L. J. Sol. Chem. 1998, 27, 979-992. Co-R bond dissociation energies of salen complexes are significantly effected by the nature of the trans ligand: (c) Li, G.; Zhang, F. F.; Chen, H.; Yin, H. F.; Chen, H. L.; Zhang, S. Y. Dalton Trans. 2002, 105-110.
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0036007053
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Unfortunately, the gas phase thermochemistry associated with the dissociation reactions of these complexes is unknown. Their solution phase electrochemistry is of limited value in making gas phase predictions on IPs, since they are dependent on both the solvent and the coordinating ligand. (a) for Co systems, see: Eichhorn, E.; Rieker, A.; Speiser, B. Angew. Chem. Int. Ed. Engl. 1992, 31, 1215-1217. (b) For Fe systems, see: (b) Ranchet, D.; Tommasino, J. B.; Vittori, O.; Fabre, P. L. J. Sol. Chem. 1998, 27, 979-992. Co-R bond dissociation energies of salen complexes are significantly effected by the nature of the trans ligand: (c) Li, G.; Zhang, F. F.; Chen, H.; Yin, H. F.; Chen, H. L.; Zhang, S. Y. Dalton Trans. 2002, 105-110.
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note
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The development of metal complexes of peptides as a bioanlytical tool hinges upon a number of condensed and gas phase factors. The ideal ternary metal complex would (i) readily form in the condensed phase, (ii) be sequence independent in its binding of peptides, (iii) readily transfer to the gas phase under ESI conditions without undergoing charge reduction or fragmentation, and (iv) fragment to give abundant peptide cation radicals. In our work we have solely focused on the gas phase fragmentation behavior of the ternary complexes and have not tried to optimize their condensed phase behavior. We note that, in general, Fe, Co, and Mn readily formed the ternary complexes in high abundance.
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The subsequent fragmentation of the peptide cation radical may be a result of electronic excitation. Schlag and co-workers have demonstrated that tetrapeptides are characterized by many and densely spaced excited electronic states and that these provide opportunities for charge migration and fragmentation in peptides: Remacle, F.; Levine, R. D.; Schlag, E. W.; Weinkauf, R. J. Phys. Chem. A 1999, 103, 10149-10158.
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Remacle, F.1
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Weinkauf, R.4
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