Basic study on a light-driven molecular spring using the two electron transfer reaction of rhodium complex

当Rh(I)与氢气反应时，它的颜色从紫色变为无色。激光光解实验表明，[Rh(Bpy)_2]^+(bpy=2，2‘-联吡啶)生成[Rh(Bpy)_2H_2]~+的反应速率约为1μS，光催化消除[Rh(Bpy)_2H_2]_2~-的反应在激光脉冲的10 ns内完成。结果表明，所合成的配合物具有一定的储氢性能。[Rh(Bpy)_2H2_]ClO_4在固体中也发生了可逆的氢捕获-释放反应，[Rh(Bpy)_2]ClO_4在光照射下呈现紫色，与其他络合固体的颜色变化相似。例如，[Ru(DBB)_2(CN)_2](BDD=4，4‘-二叔丁基-2，2’-联吡啶)通过暴露于水分和VOC(挥发性有机化合物)蒸气中改变其颜色和发光颜色。通过对VOC气体的吸附，[PT(Dpb)Cl]固体显示橙色发光。

Rhodium(I) complex changes its color from purple to colorless when it reacts with hydrogen gas. Laser photolysis revealed that the reaction rate of [Rh(bpy)_2]^+ (bpy=2,2'-bipyridine) into [Rh(bpy)_2H_2]^+ was about 1μs. H_2 elimination of [Rh(bpy)_2H_2]^- by photoirradiation underwent within 10ns of the laser pulse. It is concluded that the rhodium complexes have a capability of hydrogen storage device. The reversible hydrogen capture-release reaction was observed even in the solid state ; the purple color of [Rh(bpy)_2]ClO_4 appeared by photoirradiation of pale yellow powder of [Rh(bpy)_2H2_]ClO_4. We observed similar color-change of other complex solids like the rhodium complex. For example, [Ru(dbb)_2(CN)_2] (bdd=4,4'-di-t-Bu-2,2'-bipyridine) changes its color and luminescence color by exposure to moisture and VOC (volatile organic compound) vapor. [Pt(dpb)Cl] solid shows orange luminescence by sorption of VOC gas.