Synthesis, Structure, and Luminescent Properties of Guanidinate-Based Terbium Complexes

✍ Scribed by Xingan Pang; Hongmei Sun; Yong Zhang; Qi Shen; Hongjie Zhang

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 109 KB
• Volume: 2005
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/ejic.200400750

✦ Synopsis

Abstract

Two guanidinate‐based terbium complexes [i__PrNC(N__i__Pr~2~)N__i__Pr]~m~TbCl~3–m~ [m = 3 (1), 2 (2)] were synthesized, and the crystal structure of 1 was determined by single‐crystal X‐ray diffraction. Complexes 1 and 2 were further characterized by elemental analysis, IR, and ^1^H NMR spectroscopy. In complex 1 the guanidinate ligand coordinates to the terbium atom through the nitrogen atoms in a bidentate chelating coordination mode. As a result of an efficient energy transfer from the guanidinate ligand to the central Tb^3+^, both 1 and 2 have been found to exhibit strong green emission corresponding to Tb^3+^ ^5^D~4~‐^7^F~J~__ (J = 6, 5, 4, 3) transitions. Among them, the emission ^5^D~4~‐^7^F~5~ (550 nm) is the most prominent. The lifetimes of the ^5^D~4~ Tb^3+^ excited levels of the two complexes were determined to be around 0.90 ms. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)