Model investigations of vanadium-protein interactions: Novel vanadium(III) and oxovanadium(IV) compounds with the diamidate ligand 1,2-bis(2-pyridinecarboxamide)benzene (H(2)bpb)
Φόρτωση...
Ημερομηνία
Συγγραφείς
Vlahos, A. T.
Tolis, E. I.
Raptopoulou, C. P.
Tsohos, A.
Sigalas, M. P.
Terzis, A.
Kabanos, T. A.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
American Chemical Society
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Inorg Chem
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
Novel vanadium(III) and oxovanadium(IV) compounds with the diamidate ligand 1,2-bis(2-pyridinecarboxamide)benzene (H(2)bpb) were synthesized and structurally characterized. H(2)bpb is capable of binding to vanadium in either its anionic (dianionic-monoanionic) or its neutral form, resulting in complexes of various geometries and stoichiometries. The dianionic form (bpb(2-)), in NHEt3{trans-[VCl2(bpb)]} (1) and [VO(bpb)(H2O)].0.5dmso.0.36CH(3)OH.0.13H(2)O (6.0.5dmso.0.36CH(3)OH.0.13H(2)O), acts as a planar tetradentate bis[N-amidate-N-pyridine] equatorial ligand. The monoanionic form (Hbpb(-)) behaves as an (N-py,O-am) or (N-py,N-am) chelator in [V(Hbpb)(3)].2CHCl(3) (2.2CHCl(3)) as well as a mu(2)-bridging-eta(4)-(N-py,O-am-N-py,N-am) in [VOCl(Hbpb)](2).2CH(3)NO(2) (3.2CH(3)NO(2)), while the neutral H(2)bpb behaves as a mu(2)-bridging-eta(4)-bis(N-py,O-am) in [VOCl(H2bpb)](2).1.04CH(3)OH.1.23thf.0.74H(2)O (4.1.04CH(3)OH.1.23thf.0.74H(2)O). Compound 4.1.04CH(3)OH.1.23thf.0.74H(2)O crystallizes in the triclinic system P (1) over bar. with (at 25 degrees C) a 9.140(2) Angstrom, b = 11.058(2) Angstrom, c = 14.175(2) Angstrom, alpha = 99.013(5)degrees, beta = 104.728(7)degrees, gamma = 102.992(7)degrees, V= 1314.9(4) Angstrom(3): Z = 1, while compound 6.0.5dmso.0.36CH(3)OH.0.13H(2)O crystallizes in the monoclinic space group P2(1)/n with (at 25 degrees C) a = 11.054(5) Angstrom, b = 11.407(5) Angstrom, c = 16.964(7) Angstrom, beta = 93.2(1)degrees, V = 2136(2) Angstrom(3), Z = 4. Variable temperature magnetic susceptibility studies of the dimeric compounds 3.2CH(3)NO(2) and 4.1.03CH(3)OH show g values for the V(IV) centers that are slightly smaller than 2.0 (as expected for d(1) ions) and indicate small antiferromagnetic coupling between the two vanadium(IV) centers. Ab initio calculations were also carried out, providing results concerning the effect of the relative strength and the deformation energy involved in the eta(2)-(N-py,N-am) and eta(2)-(N-py,O-am) bonding modes in the ligation of Hbpb(-) to vanadium.
Περιγραφή
Λέξεις-κλειδιά
metal-amide bond, fungus curvularia-inaequalis, x-ray structure, crystal-structure, electrochemical properties, azotobacter-vinelandii, molecular-structure, magnetic-properties, solid-state, complexes
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000088155600006
http://pubs.acs.org/doi/pdfplus/10.1021/ic990837z
http://pubs.acs.org/doi/pdfplus/10.1021/ic990837z
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας