Dissolved organic matter in water of Daugava river

Thermal Properties of Chromium Complexes with N-benzanthronylamidinesA.I.Puchkin 1 , I.D.Ivanova 2 , E.M.Kirilova 11 Chemistry Department, Daugavpils University, 13 Vienibas str., LV-5401, Daugavpils(Latvia);2 Faculty of Chemistry, University of Latvia, 48 Valdemara str., LV-1013, Riga (Latvia).e-mail: aleksandrs.puckins@du.lvThe chemistry of functional materials of metal complexes and their applications have beenof great interest in recent years. Compounds containing amidine group have playedimportant roles as ligands for various complexes of metals in organometallic chemistry.These systems have interesting chemical and spectral properties for practical applications.For example, the use of amidinate-ligated iridium complexes for fabrication of highefficiency phosphorescent organic light-emitting devices has been recently demonstrated[1]. Therefore it was of interest to prepare new complexes of transition metal ion andligand containing electron-donating amidine group.The object of the present research was to investigate the thermal behaviour of chromium(III) complexes incorporating earlier synthesized [2] N-benzanthronylamidine ligands andto characterize it by means of elemental analysis, infrared spectroscopy, and differentialthermal analysis (TG-DTA). It was investigated coordination of fifteen amidines withCr(NO 3 ) 3 , obtaining the formation of seven complex. Elemental analysis data with thehexacoordination tendency of Cr3+ complexes, let us to suggest an octahedral geometryfor obtained complexes with three molecules coordinated to the metal centre. The TG-DTA curves provided previously unreported information about the thermal stability andthermal decomposition of these compounds.1. Y. Liu, K. Ye, Y. Fan et al. Chem. Commun. 25 (2009) 3699-3701.2. E.M Kirilova, S. V Belyakov, I. Kalnina. in: G. Vayssilov, R. Nikolova (Eds), Topics inChemistry & Materials Science, Sofia: Heron Press, 3, 2009 pp.19-28.- 13 -