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- Title
Water-Soluble (Pterin)rhenium(I) Complex: Synthesis, Structural Characterization, and Two Reversible Protonation-Deprotonation Behavior in Aqueous Solutions.
- Authors
Ragone, Fabricio; Ruiz, Gustavo T.; Piro, Oscar E.; Echeverría, Gustavo A.; Cabrerizo, Franco M.; Petroselli, Gabriela; Erra-Balsells, Rosa; Hiraoka, Kenzo; García Einschlag, Fernando S.; Wolcan, Ezequiel
- Abstract
A new water-soluble complex, Re(CO)3(pterin)(H2O), was synthesized and characterized by 1H NMR and FTIR spectroscopy, and by a combination of three mass spectrometry techniques: MALDI, probe electrospray ionisation (PESI), and ESI. Because, unlike most metal-pterin complexes, the ReI complex is quite soluble in water, appropriate single crystals could be obtained for structural X-ray analysis. We report here the first solid state molecular structure containing a pterin ligand coordinated to the Re(CO)3 core. This determination revealed that strong H bonds between the hydrogen atom of the 2-amino group and crystallization water molecules give rise to a polymeric arrangement of Re(CO)3(pterin)(H2O) complexes in the lattice. Protonation studies in aqueous solutions of the ReI complex showed two acid-base equilibriums with p Ka1 = 3.9 and p Ka2 = 8.8. p Ka1 was assigned to the protonation equilibrium at N3 of the pterin ligand in the complex and p Ka2 could be ascribed to the deprotonation of a coordinated water molecule.
- Subjects
RHENIUM compounds synthesis; MOLECULAR structure of rhenium compounds; MASS spectrometry; PROTON transfer reactions; HYDROPHILIC compounds
- Publication
European Journal of Inorganic Chemistry, 2012, Vol 2012, Issue 30, p4801
- ISSN
1434-1948
- Publication type
Article
- DOI
10.1002/ejic.201200681