Repozytorium
Wyszukaj
Kolekcje
Inne
Eight- and six-coordinated Mn(II) complexes of heteroaromatic alcohol and aldehyde: Crystal structure, spectral, magnetic, thermal and antibacterial activity studies.
Autorzy
Rok wydania
2014
Czasopismo
Spectrochimica Acta Part A-Molecular and Biomolecular Spectroscopy
Numer woluminu
129
Strony
632-642
DOI
10.1016/j.saa.2014.03.105
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Crystal, molecular and electronic structure of new manganese(II) compounds: [Mn(2-CH2OHpy)2(NO3)2] (1), [Mn(4-CHO-5-MeIm)2(NO3)2] (2) and [Mn(4-CHO-5-MeIm)2Cl2] (3), where 2-hydroxymethylpyridine (2-CH2OHpy) and 5(4)-carbaldehyde-4(5)-methylimidazole (5(4)-CHO-4(5)-MeIm), have been characterised using X-ray, spectroscopic, magnetic and TG/DTG data. In compounds 1 and 2, the Mn(II) ion is eight-coordinated forming distorted pseudo-dodecahedron, that is rather unusual for the manganese(II) complexes, whereas in 3 the Mn(II) ion environment is a distorted octahedron. The high coordination number (CN = 8) of 1 and 2 results from bidentate character of the nitrate ligands. The X-band EPR spectra of compounds 2 and 3 exhibit fine structure signals resulting from zero-field splitting (ZFS) of the spin states for high spin d5 Mn(II), whereas for 1 the broad isotropic signals were observed. The estimation of ZFS for individual Mn(II) ions was carried out for all compounds using DFT calculations. The free ligands and their manganese(II) complexes have been tested in vitro against gram-positive and gram-negative bacteria in order to assess their antimicrobial properties.
Słowa kluczowe
manganese complex, crystal structure, magnetic properties, EPR spectroscopy, N.O-donor ligand, anyibacterial activity
Adres publiczny
http://dx.doi.org/10.1016/j.saa.2014.03.105
Strona internetowa wydawcy
Podobne publikacje
Bis(tetraethylammonium) tetrabromocobaltate(II) and bis(tetrabutylammonium) tetrabromomanganate(II): structure and magnetic properties.
Styczeń E., Warnke Zygmunt, Wyrzykowski Dariusz, Kłak Julia, Mroziński Jerzy, Sikorski Artur
"Naked" [Mn3O]7+ triangles: the effect of auxiliary ligands on magnetic exchange.
Manolopoulou Efi, Stoumpos C. C., Siczek Miłosz, Lis Tadeusz, Brechin Euan K., Milios Constantinos J.
Synthesis of new pyrazole-containing binuclear and mononuclear Cu(II) complexes: crystal structure, EPR, magnetic and spectroscopic properties.
Barszcz Barbara, Głowiak Tadeusz, Jezierska Julia, Tomkiewicz Alina