A density functional study of EPR parameters for vanadyl
complexes containing schiff base ligands

J 2001

A density functional study of EPR parameters for vanadyl complexes containing schiff base ligands

MUNZAROVÁ, Markéta a Martin KAUPP

Základní údaje

Originální název

A density functional study of EPR parameters for vanadyl complexes containing schiff base ligands

Autoři

MUNZAROVÁ, Markéta (203 Česká republika, garant) a Martin KAUPP (276 Německo)

Vydání

J. Phys. Chem. B, American Chemical Society, 2001, 1089-5647

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10403 Physical chemistry

Stát vydavatele

Spojené státy

Utajení

není předmětem státního či obchodního tajemství

Impakt faktor

Impact factor: 3.379

Kód RIV

RIV/00216224:14310/01:00058716

Organizační jednotka

Přírodovědecká fakulta

UT WoS

000172945700030

Klíčová slova anglicky

ELECTRON-PARAMAGNETIC-RESONANCE; TRANSITION-METAL COMPLEXES; G-TENSORS; CHEMICAL-SHIFTS; HARTREE-FOCK; PULSED ENDOR; ENERGY; PSEUDOPOTENTIALS; EXCHANGE; ELEMENTS

Štítky

CHEMICAL-SHIFTS, ELECTRON-PARAMAGNETIC-RESONANCE, ELEMENTS, energy, exchange, g-tensors, HARTREE-FOCK, PSEUDOPOTENTIALS, PULSED ENDOR, TRANSITION-METAL COMPLEXES

Změněno: 28. 1. 2002 15:24, doc. Mgr. Markéta Munzarová, Dr. rer. nat.

Anotace

V originále

Deviations of the coordination arrangement of vanadyl complexes from a regular square pyramid are thought to influence, among other things, their biological function. Such structural distortions have been found to be reflected characteristic ally in EPR spectra (Cornman et al. Inorg. Chem. 1997, 366, 6401), In this work, density functional calculations of electronic tensors and metal hyperfine Ccoupling tensors,, have been carried out for a series of four of these vanadyl complexes with structure,, ranging from nearly trigonal bipyramidal (TBP-5) to nearly square pyramidal (SQP-5). The EPR spectroscopic parameters have been rationalized in terms of electronic and geometrical structures. Using all relevant perturbation operators together with local or gradient-corrected density functionals, Deltag-tensor components are underestimated systematically by ca. 40%. Good agreement with experiment is obtained for hyperfine tensor components calculated with hybrid functionals (B3PW91 and BHPW91), which account better for the spin polarization of the core orbitals, than GGA functionals such as BP86. The rhombicity of the hyperfine tensor is reproduced well at all levels of theory applied. It is mainly determined by the SOMO composition. The latter explains the increasing rhombicity of the A tensor with increasing distortion of the SQP-5 structures, along the series of complexes,, studied. The orientational dependence of the principal tensor component.,, on the local vanadium coordination is much more pronounced for the g tensor than for the A tensor. The principal axes of the g and A tensors are found to be rotated with respect to each other by as Much as 41 degrees.

Návaznosti

LN00A016, projekt VaV

Název: BIOMOLEKULÁRNÍ CENTRUM

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Biomolekulární centrum

Citovat

MUNZAROVÁ, Markéta a Martin KAUPP. A density functional study of EPR parameters for vanadyl complexes containing schiff base ligands. J. Phys. Chem. B. American Chemical Society, 2001, roč. 105, č. 50, s. 12644-12652. ISSN 1089-5647.

@article{391115,
   author = {Munzarová, Markéta and Kaupp, Martin},
   article_number = {50},
   keywords = {ELECTRON-PARAMAGNETIC-RESONANCE; TRANSITION-METAL COMPLEXES; G-TENSORS; CHEMICAL-SHIFTS; HARTREE-FOCK; PULSED ENDOR; ENERGY; PSEUDOPOTENTIALS;
EXCHANGE; ELEMENTS},
   language = {eng},
   issn = {1089-5647},
   journal = {J. Phys. Chem. B},
   title = {A density functional study of EPR parameters for vanadyl complexes containing schiff base ligands},
   volume = {105},
   year = {2001}
}

TY  - JOUR
ID  - 391115
AU  - Munzarová, Markéta - Kaupp, Martin
PY  - 2001
TI  - A density functional study of EPR parameters for vanadyl complexes containing schiff base ligands
JF  - J. Phys. Chem. B
VL  - 105
IS  - 50
SP  - 12644
EP  - 12644
PB  - American Chemical Society
SN  - 10895647
KW  - ELECTRON-PARAMAGNETIC-RESONANCE
KW  - TRANSITION-METAL COMPLEXES
KW  - G-TENSORS
KW  - CHEMICAL-SHIFTS
KW  - HARTREE-FOCK
KW  - PULSED ENDOR
KW  - ENERGY
KW  - PSEUDOPOTENTIALS
KW  - EXCHANGE
KW  - ELEMENTS
N2  - Deviations of the coordination arrangement of vanadyl complexes from a regular square pyramid are thought to influence, among other things, their biological function. Such structural distortions have been found to be reflected characteristic ally in EPR spectra (Cornman et al. Inorg. Chem. 1997, 366, 6401), In this work, density functional calculations of electronic tensors and metal hyperfine Ccoupling tensors,, have been carried out for a series of four of these vanadyl complexes with structure,, ranging from nearly trigonal bipyramidal (TBP-5) to nearly square pyramidal (SQP-5). The EPR spectroscopic parameters have been rationalized in terms of electronic and geometrical structures. Using all relevant perturbation operators together with local or gradient-corrected density functionals, Deltag-tensor components are underestimated systematically by ca. 40%. Good agreement with experiment is obtained for hyperfine tensor components calculated with hybrid functionals (B3PW91 and BHPW91), which account better for the spin polarization of the core orbitals, than GGA functionals such as BP86. The rhombicity of the hyperfine tensor is reproduced well at all levels of theory applied. It is mainly determined by the SOMO composition. The latter explains the increasing rhombicity of the A tensor with increasing distortion of the SQP-5 structures, along the series of complexes,, studied. The orientational dependence of the principal tensor component.,, on the local vanadium coordination is much more pronounced for the g tensor than for the A tensor. The principal axes of the g and A tensors are found to be rotated with respect to each other by as Much as 41 degrees.
ER  -

MUNZAROVÁ, Markéta a Martin KAUPP. A density functional study of EPR parameters for vanadyl complexes containing schiff base ligands. \textit{J. Phys. Chem. B}. American Chemical Society, 2001, roč.~105, č.~50, s.~12644-12652. ISSN~1089-5647.

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