Аннотация:The article describes the main properties and applications of tri- and dicarbonyl derivatives of cymantrene with an O=C donor fragment capable of coordination to the manganese. On the example of foreign and our works, it was shown that these compounds can be of interest for the creation of photosensitive smart materials due to the formation of photochromic systems between hemilabile di- and tricarbonyl complexes. The properties of these complexes of cymantrene with ketone, amide, carbamate groups, both monomeric and cascade structures were considered.