Photochemical investigations of functionalised 1,4,7,10-tetraazacyclododecane ligands incorporating naphthyl chromophores
Photochemical investigations of functionalised 1,4,7,10-tetraazacyclododecane ligands incorporating naphthyl chromophores
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DOI：
10.1039/p29960001565
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发表时间：
1996-08-01
期刊：
影响因子：
--
通讯作者：
Williams, JAG
中科院分区：
文献类型：
--
作者：
Beeby, A;Parker, D;Williams, JAG
研究了两种含双-（β -萘酰胺）基团的大环配体- ch2con (CH2C10H7)(2)作为荧光团在水和乙腈中的荧光性质。在猝灭离子（如Pb2+， Ni2+， Cu2+和Eu3+）和非猝灭离子（如Zn2+和Cd2+）存在下，配体表现出独特的发光行为。准分子与单体强度比在不同程度上受到影响，总积分荧光强度也是如此。这种行为与先前报道的含有“孤立的”萘基单位的相关配体的行为形成对比。这些早期配体之一的铽配合物的发光特性，只含有一个萘基，已经被详细研究。观察到萘敏化金属发射，但纳秒激光闪光光解研究表明，向萘三重态的反向能量转移为金属激发态提供了一个简单的失活机制。
The fluorescence properties of two macrocyclic ligands incorporating bis-(beta-naphthyl amide) groups, -CH2CON(CH2C10H7)(2), as fluorophores, have been studied in water and acetonitrile. The ligands exhibit distinctive luminescence behaviour in the presence of quenching (e.g. Pb2+, Ni2+, Cu2+ and Eu3+) and non-quenching ions (e.g. Zn2+ and Cd2+). Excimer-to-monomer intensity ratios are affected to differing extents, as are the total integrated fluorescence intensities. The behaviour is contrasted to that reported previously for related ligands containing 'isolated' naphthyl units, The luminescence properties of the terbium complex of one of these earlier ligands, containing just one naphthalene group, have been studied in detail. Naphthyl-sensitised metal emission is observed but a nanosecond laser flash photolysis study reveals that back energy transfer to the naphthyl triplet state provides a facile deactivation mechanism for the metal excited state.