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Issue 12, 2009
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Structural and photoluminescent studies of lanthanide complexes with tripodal triRNTB (N-substituted tris(benzimidazol-2-ylmethyl)amine): ligand substituent, anionic and secondary ligand effects

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Abstract

Six N-substituted NTB ligands (NTB = (tris(benzimidazol-2-ylmethyl)amine), namely, triMeNTB (L1), triEtNTB (L2), triPrNTB (L3), triBuNTB (L4), triAlNTB (L5) and triBzNTB (L6), have been synthesized through replacing the H atoms on the NH groups by methyl, ethyl, npropyl, nbutyl, allyl, and benzyl groups, respectively. Their corresponding Sm3+, Eu3+ and Tb3+ complexes consisting of different anions or secondary ligands have been prepared and characterized by elemental analyses, IR spectra and single-crystal X-ray diffraction measurements. Three types of structural models have been obtained: ML2 where two triTNTB ligands wrap around the Ln3+ ion with anions (ClO4 and CF3SO3) free of coordination, MLA3 where one triRNTB ligand holds the Ln3+ ion with anions (Cl, NO3 and picrate) participating in coordination, and MLL3 where one triNTB ligand and three secondary antipyrine ligands coordinate with the Ln3+ ion. The Ln3+ ions in ML2 type complexes are 8-coordinating and display a slightly distorted cubic (LnN8) coordination geometry. The Ln3+ ions in MLA3 and MLL3 types complexes show two different coordination geometries: one is 7-coordinating (MLA3 with Cl anion and MLL3), which can be described as a severely distorted cube short of one corner (LnN4Cl3 or LnN4O3), and the other is 10-coordinating (MLA3 with NO3 and picrate anions) which can be regarded as a severely distorted cube with one corner substituted by a three-atom cap (LnN4O6). The photoluminescent study reveals that the complexes with different Ln3+ ions show a general luminescent intensity tendency of Tb > Eu > Sm. The modification of the NTB molecule by altering R groups tunes the triplet states of the ligands and results in differentiable photophysical properties of the complexes. The anions or secondary ligand also have remarkable effects on the luminescent properties of the complexes.

Graphical abstract: Structural and photoluminescent studies of lanthanide complexes with tripodal triRNTB (N-substituted tris(benzimidazol-2-ylmethyl)amine): ligand substituent, anionic and secondary ligand effects

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Submitted
20 Oct 2008
Accepted
10 Dec 2008
First published
03 Feb 2009

Dalton Trans., 2009, 2157-2169
Article type
Paper

Structural and photoluminescent studies of lanthanide complexes with tripodal triRNTB (N-substituted tris(benzimidazol-2-ylmethyl)amine): ligand substituent, anionic and secondary ligand effects

M. Pan, X. Zheng, Y. Liu, W. Liu and C. Su, Dalton Trans., 2009, 2157
DOI: 10.1039/B818322H

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