Selvanathan Pramila, Dorcet Vincent, Roisnel Thierry, Bernot Kévin, Huang Gang, Le Guennic Boris, Norel Lucie, Rigaut Stéphane
Univ Rennes, INSA Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226, F-35000 Rennes, France.
Dalton Trans. 2018 Mar 28;47(12):4139-4148. doi: 10.1039/c8dt00299a. Epub 2018 Feb 22.
We report the synthesis of two lanthanide complexes including a chelating merocyanine (MC) ligand obtained from the reaction of a bis(pyridinemethyl)amine substituted spiropyran with yttrium(iii) or dysprosium(iii) triflate salts, whose structures were confirmed both in the solid state and in solution by single crystal X-ray diffraction studies and NMR investigations. The obtained merocyanine metal complexes can reversibly undergo a photo-triggered transformation consisting of a partial isomerization of the trans-merocyanine ligand to its cis isomer (cis-MC) providing complexes in which the metal-phenolate bond is retained. SQUID magnetometry experiments in combination with ab initio calculations were used to evidence and rationalize the single-molecule magnet behavior of the dysprosium complex and to probe the changes in the dysprosium ion local environment upon photo-isomerization.
我们报道了两种镧系配合物的合成，其中包括一种螯合部花青（MC）配体，该配体由双（吡啶甲基）胺取代的螺吡喃与三氟甲磺酸钇（III）或镝（III）盐反应制得，其结构通过单晶X射线衍射研究和核磁共振研究在固态和溶液中均得到证实。所得到的部花青金属配合物可以可逆地经历光触发转变，该转变包括反式部花青配体部分异构化为其顺式异构体（顺式-MC），从而得到保留了金属-酚盐键的配合物。结合从头算计算的超导量子干涉仪磁力测量实验用于证明和解释镝配合物的单分子磁行为，并探测光异构化后镝离子局部环境的变化。
