Wydział Chemii

Raj Pal Sharma

Anju Saini

Divyakshi Monga

Paloth Venugopalan

Julia Jezierska

Andrew Ozarowski

Valeria Ferretti

2014

New Journal of Chemistry

38

437-447

10.1039/c3nj00736g

Naukowa

Angielski

Artykuł

Three novel copper(II) 2-nitrobenzoate complexes, [Cu(g-pic)2(2-nitrobenzoate)2] 1, [Cu(b-pic)2(2-nitrobenzoate)2(H2O)2] 2 and [Cu2(H2tea)2(2-nitrobenzoate)2]2(H2O) 3 (where g-pic = 4-methylpyridine, b-pic = 3-methylpyridine and H2tea = mono deprotonated triethanolamine), were isolated by addition of g-pic, b-pic and H3tea to the hydrated copper(II) 2-nitrobenzoate, [Cu2(2-nitrobenzoate)4(H2O)2]2H2O, suspended in a methanol : water (4 : 1) mixture. The newly synthesized complexes have been characterized by elemental analyses, thermogravimetric analysis (TGA), spectroscopic techniques (EPR, IR and UV/Visible), magnetic susceptibility measurements, single crystal X-ray structure determination and DFT study. All compounds crystallize in the monoclinic crystal system with the P21/c space group. X-ray structure determination revealed the presence of monomers in both 1 and 2 and dimer in 3 with the deprotonated oxygen atom of the H2tea ligand bridging two Cu(II) atoms. Two co-crystallized water molecules are also present in 3. The crystal lattice is stabilized by C–HO hydrogen bonding interactions in 1 and O–HO, C–HO hydrogen bonding interactions in 2 and 3. The dimeric complex exhibits relatively strong ferromagnetic exchange with J = 100 cm1 (corresponding to H = JS1S2). The zero-field splitting parameters (zfs) of the dimer triplet states D and E were derived from HF EPR spectra recorded at moderately low temperatures. The sign of D was determined from low-temperature HF EPR spectra.

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http://dx.doi.org/10.1039/c3nj00736g

https://www.rsc.org/