Wydział Chemii

Agnieszka Wojciechowska

M. Daszkiewicz

Zbigniew Staszak

Agnieszka Trusz-Zdybek

Alina Bieńko

Andrew Ozarowski

2011

Inorganic Chemistry

50

11532-11542

10.1021/ic201471f

Naukowa

Angielski

Artykuł

The [Ni(Im)₂(l-tyr)₂]·4H₂O (1) complex was obtained in crystalline form as a product of interaction of l-tyrosine sodium salt, imidazole, and NiSO₄. The X-ray structure was determined, and the spectral (IR, FIR, NIR–vis–UV, HF EPR) and magnetic properties were studied. The Ni²⁺ ion is hexacoordinated by the N and O atoms from two l-tyrosine molecules and by two N atoms of imidazole, resulting in a slightly distorted octahedral [NiN₂N₂′O₂] geometry with a tetragonality parameter T = 0.995. The bands observed in the electronic spectra were ascribed to the six spin-allowed electronic transitions ³B_1g → ³E_g and ³B_2g, ³B_1g → ³A_2g and ³E_g, and ³B_1g → ³A_2g and ³E_g. The spin Hamiltonian parameters g, D, and E, which were determined from high-field HF EPR spectra, excellently reproduced the magnetic properties of the complex. Calculation of the zero-field splitting in the S = 1 state of nickel(II) using DFT and UHF was attempted. The biological activity of the complexes has been tested for antifungal and antibacterial effects against Aspergillus flavus, Fusarium solani, Penicillium verrucosu, Bacillus subtilis, Serratia marcescens, Pseudomonas fluorescens, and Escherichia coli.

https://doi.org/10.1021/ic201471f

https://www.acs.org/content/acs/en.html