Unit:
Κατεύθυνση Ανόργανη Χημεία και ΤεχνολογίαLibrary of the School of Science
Author:
Στάμος Νικόλαος - Άγγελος
Supervisors info:
Δρ. Κυρίτσης Παναγιώτης Αν. Καθηγητής ΕΚΠΑ (Επιβλέπων), Δρ. Μεθενίτης Κωνσταντίνος Αν. Καθηγητής ΕΚΠΑ, Δρ. Μητσοπούλου Χριστιάνα Καθηγήτρια ΕΚΠΑ
Original Title:
Mελέτη των συμπλόκων [VO{Ph2P(O)NP(O)Ph2}2] και [Cu{Ph2P(O)NP(O)Ph2}2] με φασματοσκοπία EPR
Translated title:
Study of complexes [CO {Ph2P (O) NP (O) Ph2} 2] and [Cu {Ph2P (O) NP (O) Ph2} 2] by EPR spectroscopy
Summary:
In the work presented in this Thesis, inorganic complexes were characterized by
electron paramagnetic resonance (EPR) spectroscopy.EPR is a method for
investigating paramagnetic substances,providing information about the
electronic structure of the system, expressed bytheLande (g) factor, the
hyperfine couplingconstant (A) and the quadrupole moment (Q). The values of the
forementioned,aswell as the zero-field splitting (ZFS) insystems with more than
one unpaired electron (S> ½), constitute a fingerprint of a given system. The
hyperfine coupling probes interactions between nucleiwith Ι 0and the unpaired
electron density,at a distance up to ca. 10 A. EPR spectroscopy is suitable for
systems which are not easily accessible by other techniques. In the current
thesis, the methodologies of continuous wave EPR (CW-EPR), as well as pulsed
EPR techniques, such as ESEEM(electron spin echo envelope modulation),
ENDOR(electron nuclear double resonance) and HYSCORE(hyperfine sublevel
correlation), will be described hereinafter. In this work, the S = ½
complexes[VO{Ph2P(O)NP(O)Ph2}2] and [Cu{Ph2P(O)NP(O)Ph2}2] were mainly studied
by HYSCORE spectroscopy, which made possible to probe metal-ligand weak
interactions. These interactions can be described quantitatively via the
hyperfine coupling involving the P, N and H atoms of the ligand, providing
strong evidence of delocalization of the unpaired electron density towards the
ligand.
Keywords:
CW-EPR, Pulsed-EPR, ENDOR, ESEEM, HYSCORE, Complex Cu(II) VO2+
Number of index pages:
1-12
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