Cookies ussage consent
Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.
I agree, do not show this message again.Spectral properties of Tb(III) and Nd(III) complexes with 3,3’-[(phenylmethylene)]bis(4-hydroxy-2H-1-benzopyran- 2-one)
V. KIRCHEVA1,* , J. ZAHARIEVA1, I. MANOLOV2, M. MILANOVA1
Affiliation
- Sofia University, Faculty of Chemistry, Department of Inorganic Chemistry, 1, J. Bourchier Blvd., 1164 Sofia, Bulgaria
- Medical University, Faculty of Pharmacy, Department of Organic Chemistry, 1, Dunav Str., 1000 Sofia, Bulgaria
Abstract
Complexes of the trivalent lanthanoid ions of Nd(III) and Tb(III) with some 3,3’-[(phenylmethylene)]bis(4-hydroxy-2H-1-benzopyran-2-one) derivates such as 3,3’-[(4-chlorоphenyl)methylene)bis-(4-hydroxy-2H-1-benzopyran-2-one) and 3,3’-[(3,5-dimethoxy-4-hydroxyphenyl)methylene]bis-(4-hydroxy-2H-1-benzopyran-2-one) were synthesized, following three synthetic procedures. The complexes formed were investigated with elemental analysis, IR- spectroscopy, and fluorescence spectroscopy. Deconvolution of IR-spectra was applied and used to elucidate the molecular structure and the possibilities for coordination of coumarin ligands to the lanthanoid (III) ions. Based on the vibrational analysis coordination through deprotonated hydroxyl group and oxygen atom of the carbonyl group is suggested. Excitation and emission spectra of the newly synthesized complexes were recorded and interpreted. The water molecules coordinated do not influence the emission in the visible region of the Tb(III) complexes while in the case of Nd(III) complex they perform as a very strong quenching agent. The Nd(III) complexes without any coordinated water molecules but with acetonitrile in the outer sphere show the intensive band at 1050 nm responding to the strongest transition 4F3/2 → 4I11/2..
Keywords
3,3’-[(phenylmethylene)]bis(4-hydroxy-2H-1-benzopyran-2-one) derivatives, Tb complexes, Nd complexes, Fluorescence.
Submitted at: Aug. 10, 2020
Accepted at: Oct. 7, 2021
Citation
V. KIRCHEVA, J. ZAHARIEVA, I. MANOLOV, M. MILANOVA, Spectral properties of Tb(III) and Nd(III) complexes with 3,3’-[(phenylmethylene)]bis(4-hydroxy-2H-1-benzopyran- 2-one), Journal of Optoelectronics and Advanced Materials Vol. 23, Iss. 9-10, pp. 508-517 (2021)
- Download Fulltext
- Downloads: 315 (from 197 distinct Internet Addresses ).