Determination of contributions of various molecular groups to nonradiative deactivation of electronic excitation energy in β-diketonate complexes of ytterbium(III)
Determination of contributions of various molecular groups to nonradiative deactivation of electronic excitation energy in β-diketonate complexes of ytterbium(III)
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DOI：
10.1134/1.1374653
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发表时间：
2001-05
影响因子：
0.6
通讯作者：
M. Tsvirko;S. Meshkova;V. Venchikov;Z. Topilova;D. V. Bol’shoi
中科院分区：
文献类型：
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作者：
M. Tsvirko;S. Meshkova;V. Venchikov;Z. Topilova;D. V. Bol’shoi
测量了Yb与二苯甲酰甲烷和噻吩甲酰三氟丙酮及其类似物与溶解于甲苯的重氢中心C-H基团和重水二甲基亚砜(→-d0)形成的双配位和杂化配合物的2F5/2 DMSO2F7/2荧光的量子产率和寿命。结果表明，在β-d6溶液中，氢化反应能显著延长Yb3+的荧光寿命(噻吩甲酰三氟丙酮的荧光寿命可达72μS)。在实验数据的基础上，建立了一组方程，从而可以确定络合物的各种分子基团和外球溶剂对Yb的2F5/2态的非辐射失活的贡献。讨论了制备具有改善荧光特性的Yb3+配合物的可能方法。
Quantum yields and lifetimes of2F5/2→2F7/2fluorescence are measured for double and heteroligand complexes of ytterbium with dibenzoylmethane and thenoyltrifluoroacetone, as well as their analogs with a deuterated central C-H group dissolved in toluene and deuterated dimethyl sulfoxide (DMSO-d0). Deuteration of β-diketone is shown to cause a significant increase in the lifetime of Yb3+fluorescence (up to 72 μs for thenoyltrifluoroacetone in DMSO-d6). Based on the experimental data, a system of equations is constructed that makes it possible to determine contributions of various molecular groups of a complex and the externalsphere solvent to nonradiative deactivation of the2F5/2state of ytterbium. Possible ways of producing Yb3+complexes with improved fluorescent characteristics are discussed.