Photophysical Properties of Some Binary and Ternary Complexes of Rare Earth Ions with Aminobenzoic Acids and 1,10-Phenanthroline

Abstract

Photophysical properties (e.g. luminescence and energy transfer) of binary and ternary complexes of Gd 3 , Eu 3 , and Tb 3 with aminobenzoic acids and 1,10-phenanthroline were studied in connection with their spectroscopic characterization. Intramolecular energy transfer between center ions and ligands as well as between ligands is discussed in detail.

From molecules to materials: a new way to construct luminescent chemical bonded hybrid systems based with ternary lanthanide complexes of 1,10-phenanthroline

“…Lately, a few researches regarding the covalently bonded hybrids have emerged and the as-derived molecular-based materials exhibit monophasic appearance even at a high concentration of lanthanide complexes [4][5][6][7][8][9][10][11][12][13]. Hence, the critical step to prepare such materials is to synthesize a novel monomer as a covalent bridge which can not only develop chelating effects that can bind to lanthanide ions (Ln 3+ ) but also act as precursors of inorganic network [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Some previous researches have concentrated on the modification of pyridine-dicarboxylic acid or their [12] and some others focus on modification of aminobenzoic acid or di-pyridine [5,6].…”

“…In hybrids B or C, 1,10-phenanthroline absorbs the energy to become the major energy donor and transfer it to lanthanide ions in its hybrid system. According to the energy transfer and intramolecular energy mechanism [14][15][16][17][18][19], it can be predicted that the triplet state energy of MPTMS-Phen is quite suitable for the luminescence of terbium ions (20,500 cm À1 ) because the optimal energy match exists between ligands and the resonant emissive energy level of the central Tb 3+ ions.…”

Terbium/zinc luminescent hybrid siloxane-oxide materials bridged by novel ureasils linkages

“…As discussed above, there should exist an optimal energy difference between the triplet position of Sal-Si and the emissive energy level Ln 3+ , the larger and the smaller DE(Tr-Ln 3+ ) will decrease the luminescence properties of rare earth complexes. In terms of lanthanide-aromatic acid complexes, the suitable value was proved to be around 4000 ± 500 cm À1 [26,27,[29][30][31][32][33][34][35]. In consequence, modified organic monomer Sal-Si (24 038 cm À1 ) will be more proper than original salicylic acid (23 041 cm À1 ) in regard to the emissive energy level of center terbium ions (20 408 cm À1 , 490 nm, 5 D 4 !…”

Designing a family of luminescent hybrid materials by 3-(triethoxysilyl)-propyl isocyanate grafted 2-hydroxynicotinic acid bridge molecules

“…It can be found that the maximum phosphorescence band (B) locating at 433 nm determined triplet state energy of HNIC-Si to be 23 095 cm À1 . According to the energy transfer and intramolecular energy mechanism [25][26][27][28][29][30][31][32][33], it can be predicted that the bridging HNIC-Si is suitable for the luminescence of terbium (20 500 cm À1 ) and europium (17 265 cm À1 ) ions. Fig.…”