Dissolved organic matter in water of Daugava river

Structural Investigation of Novel Organic Materials with PhotophysicalPropertiesS.Belyakov* 1 , A.Yanychev 2 , M.Fleisher 11 Latvian Institute of Organic Synthesis, Riga, Latvia;2 Riga Technical University, Riga, Latvia.e-mail: serg@osi.lvIn recent years a series of organic compounds with photophysical properties has beenstudied by means of X-ray diffraction and theoretical calculations. The molecular andcrystal structure of these compounds are intensively investigated, because there are muchunexpected results. In this presentation the results of the following investigations will bereported: molecular and crystal structures of 2-(4’-Dimethylamino)-benzylydene-1,3-indandione (DMABI) analogues, structure of 8-mercaptoquinoline and 8-selenoquinolinecomplexes containing metal atoms, structure of benzanthrone derivatives. Part of theseinvestigations has been published earlier as original articles [1-6]; the other part will bepresented for the first time.1. B Silina, E., Belyakov, S., Ashaks, J., Pecha, L., Zaruma, D. Tris(2-methylquinoline-8-selenolatok1 N,Se)antimony (III). Acta Crystallogr. 2007, vol.63.,Sec.C. p. m62-m64.2. Belyakov, S., Kampars, V., Pastors, P.J., Tokmakov, A. 2-(4,5,6,7,8,9-Hexahydro-6aazaphenylen-2-ylmethylene)indian-1,3-dione.Acta Crystallogr. 2008, vol.64.,Sec.E. p. o1200.3. Kirilova, E.M., Belyakov, S.V., Kirilov, G.K., Kalnina, I., Gerbreder, V. Luminescent propertiesand crystal structure of novel benzanthrone dyes. J. Luminescence 2009, vol.129, p. 1827-1830.4. Silina, E., Belyakov, S., Ashaks, J., Pecha, L., Zaruma, D. Crystal structure of catena-poly[bis (8-mercaptoquinolinato-N,S)disilver(I)], Ag 2 (C 9 H 6 NS) 2 . Zeitschrift für Kristallographie 2010,no.225. p. 211-212.- 12 -