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

铑(I)络合物与氢气反应时，颜色由紫色变为无色。激光光解反应表明[Rh(bpy)_2]^+ （bpy=2,2'-联吡啶）生成[Rh(bpy)_2H_2]^+的反应速率约为1μs。光照射对[Rh(bpy)_2H_2]^-的H_2消除在激光脉冲的10ns内完成。结果表明，铑配合物具有储氢性能。在固态下也能观察到可逆的氢捕获-释放反应；用淡黄色的[Rh(bpy)_2H2_]ClO_4粉末光照射，[Rh(bpy)_2]ClO_4呈现紫色。我们观察到类似的颜色变化的其他复杂固体，如铑络合物。例如，[Ru(dbb)_2(CN)_2] （bdd=4,4'-di-t- bu -2,2'-联吡啶）暴露于湿气和挥发性有机化合物（VOC）蒸气中会改变其颜色和发光颜色。[Pt(dpb)Cl]固体在挥发性有机化合物（VOC）气体的吸附作用下发出橙色发光。

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.