Comparative Analysis of Photoswitching Properties of Analogous Nickel(II) and Palladium(II) Nitrite Complexes in the Solid State

• DOI: 10.1021/acs.cgd.4c00956
• Publication Date: 2024-12-04T13:57:06Z
• Authors: Kacper Paszczyk; Krystyna A. Deresz; Radosław Kamiński; Patryk Borowski; Dominik Schaniel; Adam Krówczyński; Katarzyna N. Jarz...
• Keywords: Dichloromethane

Two analogous photoswitchable square-planar nitrite coordination compounds of NiII and PdII with the (N,N,O)-donor (1-phenyl-3-(2'-picolylimino)prop-2-en-1-one) ancillary ligand, Ni-1a Pd-1a, are reported. The samples were thoroughly characterized (photo)crystallographically, spectroscopically, computationally. crystallizes in P1̅ space group one molecule comprising asymmetric unit, whereas Pd-1a tends to form polymorphic (Pd-1a Pd-1a′) solvatomorphic (with dichloromethane: Pd-1a-DCM chloroform: Pd-1a-CHCl3) crystal structures. In structure, nitro binding mode is dominant; however, some traces endo-nitrito isomer detected, for palladium derivative, purely observed all forms 100–290 K temperature range. Ni-1a, efficient photoswitches working between 100 200 K, conversions as high 80–100% upon 470–530 nm light-emitting diode irradiation. At above, decrease population photogenerated product observed. Under continuous light irradiation, notable can be generated crystallograhically detected also at higher temperatures (up around 240 K). case faster, its decay slower than Pd-1a. It should noted that only symmetry-independent photoswitchable. turn, Pd-1a′ Pd-1a-CHCl3 systems appeared nonphotoactive. Such behavior explained by energetic factors, orientation, shape reaction cavity. Interestingly, a strong linear correlation M···M distance structures examined noted.