Controlled assembly of heterometallic lanthanide(III) macrocycles: incorporation of photoactive and highly paramagnetic metal centres within a single complex
Controlled assembly of heterometallic lanthanide(III) macrocycles: incorporation of photoactive and highly paramagnetic metal centres within a single complex
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DOI：
10.1080/10610278.2011.632823
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发表时间：
2012-02
影响因子：
3.3
通讯作者：
D. J. Lewis;Federica Moretta;Z. Pikramenou
中科院分区：
文献类型：
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作者：
D. J. Lewis;Federica Moretta;Z. Pikramenou
基于最近的发现，杂金属镧系元素配合物可以组装在一个可控的方式使用硫醇-二硫化物化学，我们现在提出的组装大环，含有光活性和高顺磁性中心作为潜在的双峰探针。通过紫外-可见吸收光谱和电喷雾质谱监测大环化合物M1和M2的组装。大环M1含有Eu 3+和Gd 3+镧系元素中心，并且具有作为用于可见发射和磁共振成像测量的双输出探针的潜力。的Eu 3+的发射相比，扰动的isoabsorbent非大环等效复杂，EuL x。大环M2结合了Eu 3+和Nd 3+镧系元素中心，用于电磁光谱的可见光和近红外区域的双光输出。我们表明，在M2有一个猝灭效应的Eu 3+中心，造成的近端Nd 3+中心的存在下，归因于能量转移从Eu 3+到Nd 3+。
Building on the recent discovery that heterometallic lanthanide complexes can be assembled in a controlled manner using thiol–disulphide chemistry, we now present the assembly of macrocycles that contain both photoactive and highly paramagnetic centres as potential bimodal probes. The assembly of macrocycles M1 and M2 was monitored by UV–visible absorption spectroscopy and electrospray mass spectrometry. Macrocycle M1 contains both Eu3+ and Gd3+ lanthanide centres, and has potential as a dual output probe for visible emission and magnetic resonance imaging measurements. The Eu3+ emission is perturbed compared to an isoabsorptive non-macrocyclic equivalent complex, EuL x . Macrocycle M2 incorporates Eu3+ and Nd3+ lanthanide centres for dual optical output in the visible and near-infrared regions of the electromagnetic spectrum. We demonstrate that in M2 there is a quenching effect on the Eu3+ centre, caused by the presence of the proximal Nd3+ centre, attributed to energy transfer from Eu3+ to Nd3+.