Naslov
Preparation and structural, spectroscopic, thermal, and electrochemical characterizations of iron(III) compounds containing dipicolinate and 2-aminopyrimidine or acridine

Autori
Tabatabaee, Masoumeh ; Abbasi, Fatemeh ; Kukovec, Boris-Marko ; Nasirizadeh, Navid

Izvornik
Journal of coordination chemistry (0095-8972) 64 (2011), 10; 1718-1728

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

Ključne riječi
crystal structure; dipicolinate; iron(III) complex; π-π interactions; voltammetry

Sažetak
Two new iron(III) compounds, (Hamp)[Fe(pydc)2] ⋅ 2H2O (1) and (Hacr)[Fe(pydc)2] ⋅ 2H2O (2), (pydc2- = pyridine-2, 6-dicarboxylic acid, amp = 2-aminopyrimidine, acr = acridine) have been hydrothermally synthesized. Both compounds were characterized by spectroscopic methods (IR, UV/Vis), their molecular and crystal structures were determined by X-ray crystal structure analysis and their thermal stability by TGA/DTA methods. Compound 1 consists of Hamp+ cation and [Fe(pydc)2]¯ anion and compound 2 consists of Hacr+ cation and [Fe(pydc)2]¯ anion. Crystallographic characterization revealed an octahedron as a coordination polyhedron for the complex anion in 1 and 2 and the same O, N, O-chelated coordination mode of pyridine-2, 6- dicarboxylate. The crystal structures of 1 and 2 are stabilized by complicated network of hydrogen bonds between the crystallization water molecules, counter ion and carboxylate groups of pydc2ı. Thermogravimetric analyses of the two compounds were carried out to examine their thermal stabilities. Cyclic voltammetric response of bare glassy carbon electrode surface in 0.10 M phosphate buffer solutions containing 1 and 2 at different pH values indicated that they have the same voltammograms at all pH values and electrochemical behavior of 1 and 2 has not been affected by different ion pairs. The formal potential of the solutions of 1 and 2 at the glassy carbon electrode surface was also pH-dependent with a slope of −57.0 mV/pH unit at 25 °C. This shows that the number of electrons and protons involved in the electrode process is equal.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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