Naslov
Two new dinuclear complexes with dipicolinate and bridging 2-aminopyrazine ligands: preparation, structural, spectroscopic and thermal characterizations

Autori
Tabatabaee, Masoumeh ; Rashidi, Sommayeh ; Islaminia, Maryam ; Ghassemzadeh, Mitra ; Molčanov, Krešimir ; Neumueller, Bernhard

Izvornik
Journal of coordination chemistry (0095-8972) 65 (2012), 19; 3449-3457

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
dinuclear complex; copper complex; zinc complex; dipicolinic acid; 2-aminopyrazine

Sažetak
Treatment of an aqueous solution of dipicolinic acid (dipicH2) and 2-aminopyrazine (apyz) with Cu(NO3)2∙3H2O or ZnCl2 (in molar ratio 1:1:1) led to the formation of dinuclear complexes of [M2(H2O)4(dipic)2(µ-apyz)] (M = Cu (1) and Zn (2)). Both complexes were characterized by elemental analysis, IR and UV-Vis spectroscopy. Their molecular and crystal structures were determined by X-ray crystal structure analysis and their thermal stability was confirmed by TGA-DTA methods. Complex 1 crystallizes in the triclinic P space group, while complex 2 crystallizes in the monoclinic P21/c space group. The dinuclear complexes are analogous and composed of two metal ions bridged by 2-aminopyrazine molecules. Each M(II) ion is coordinated by one nitrogen and two oxygen atoms of the tridentate dipicolinate anion, one heterocyclic nitrogen atom of the 2-aminopyrazine and two oxygen atoms of coordinated water molecules. The resulting geometry for the MN2O4 coordination environment can be described as distorted octahedral. Extensive hydrogen bonding interactions involving all aqua ligands, dipicolinate oxygen atoms and amino groups further stabilize the complex units by linking them to form three dimensional networks for 1 and 2 respectively.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA