Naslov
Complexes of zinc(II) halides with N-benzyl- and N-p-tolyl-2-oxo-1-naphthylideneamine - preparation and characterization

Autori
Popović, Zora ; Roje, Vibor ; Pavlović, Gordana ; Matković-Čalogović, Dubravka ; Rajić, Maša ; Leban, Ivan

Izvornik
Polyhedron (0277-5387) 23 (2004), 8; 1293-1302

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

Ključne riječi
Zinc complexes ; Schiff-bases ; Crystal structures ; IR ; UV and NMR spectroscopy ; Thermal analysis

Sažetak
A series of novel complexes, dihalo-bis(N-benzyl-2-oxo-1-naphthylideneamine-O)zinc(II), ZnX2(bznapH)2 (1–3), dihalo-bis(N-p-tolyl-2-oxo-1-naphthylideneamine-O)zinc(II), ZnX2(tolnapH)2 (4–6), of the general formula [ZnX2(LH)2] X=Cl, Br, I, have been prepared. The crystal structures of four compounds (1–4) reveal four coordinated zinc centres by two halogen and two oxygen atoms from the Schiff-base in the form of distorted tetrahedra. Complex 4 crystallizes as the one-to-one solvate with ethanol. The tetrahedral distortion is most pronounced in the structure of ZnI2(bznapH)2 complex. X-ray structural data showed that the Schiff-base ligand in the naphthylideneamine tautomeric form is weakly bound to Zn atom in 1–4 (being in the range from 1.952(3) Å in 2 to 2.002(3) Å in 4). The molecular structures of 1–4 are governed by the type of halide and the corresponding Schiff-base. Although the structure comparison of ZnX2(bznapH)2 vs. ZnX2(tolnapH)2 leads to the conclusion that ligand spatial accomodation (non-planar bznapH with aliphatic interruption vs. aromatic tolnapH) is the dominating factor in the crystal structures. The crystal structures of 2–4 are dominated by van der Waals forces. There is a weak intermolecular hydrogen bond of the C–H⋯Cl type in 1 (3.710(5) Å joining molecules into endless chains. The UV–Vis and 1H NMR spectra, obtained in ethanolic and acetone solution indicate that the complexes do not exist in the solutions.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Kemijsko inženjerstvo

POVEZANOST RADA