A series of 3-cymantrenylalkylisothioureas (2) was synthesized. DFT calculations showed that compounds 2 in solutions are dimers. The photolysis of 2 was studied by IR, UV–vis and NMR spectroscopic methods. Irradiation of compounds 2 results in the formation of two type chelates, in which the manganese atom is coordinated to the S (3) or N (4) atoms of a substituent. The color of solutions sharply changes giving in the UV–vis spectra two new bands at 485 and 590 nm, respectively. In the presence of CO, dicarbonyl chelates enter the reverse thermal reaction to give the starting tricarbonyl complexes thus forming intermolecular photochromic systems. A quantum yield of the photolysis of 2a in benzene equals 0.63 ± 0.07. In the absence of СО, intramolecular linkage isomerization of 4 to 3 occurs. It was found that the bulkiness of a substituent at the sulfur atom insignificantly influences the reaction rate of the reverse thermal reaction. Chelate 3a was isolated; its photolysis gives orange chelate 4a, which isomerizes to violet chelate 3a forming an intramolecular photochromic pair.

合成了一系列的3-环丙烯基烷基异硫脲（2）。DFT计算表明溶液中的化合物2是二聚体。通过IR，UV-vis和NMR光谱方法研究了2的光解。化合物2的辐射导致形成两种螯合物，其中锰原子与S（3）或N（4）取代基的原子。溶液的颜色急剧变化，分别在485和590 nm的UV-vis光谱中出现两个新的波段。在CO存在下，二羰基螯合物进入逆热反应，得到起始的三羰基络合物，从而形成分子间光致变色体系。2a在苯中的光解量子产率为0.63±0.07。在没有СО的情况下，发生4至3的分子内键异构化。已经发现，取代基在硫原子上的庞大程度对反向热反应的反应速率影响不大。螯合物3a被分离；其光解产生橙色螯合物4a，异构化为紫色螯合物形成分子内光致变色对的3a。