Exploring Photoswitchable Properties of Two Nitro Nickel(II) Complexes with (N,N,O)-Donor Ligands and Their Copper(II) Analogues

• DOI: 10.1021/acs.inorgchem.2c00526
• Publication Date: 2022-04-16T12:52:05Z
• Authors: Patryk Borowski; Sylwia E. Kutniewska; Radosław Kamiński; Adam Krówczyński; Dominik Schaniel; Katarzyna N. Jarz...
• Keywords: Linkage isomerism

Two photoswitchable nickel(II) nitro coordination compounds and their copper(II) analogues are reported. In all these systems, the metal center is chelated by (N,N,O)-donor ligands containing either 2-picolylamine or 8-aminoquinoline fragments. The studied were thoroughly investigated using crystallographic spectroscopic techniques supplemented computational analysis. They easy to synthesize stable, undergo group isomerization reaction. Nevertheless, there significant differences between copper nickel systems regarding structural switchable properties. According solid-state IR spectroscopy results, 400-660 nm light irradiation of ground-state (η2-O,O')-κ-nitrito complexes at 10 K induces a rather moderate conversion metastable linkage isomer, which visible only up approximately 60-80 K. turn, upon (ca. 530 excitation wavelength), isomers examined transform into endo-nitrito forms. It was possible achieve about 35% for both determine resulting crystal structures 160 in case single crystals after 30-45 min exposure LED (crystals decayed with longer irradiation), roughly 95% achieved thin-film samples as indicated results. Traces remained 200-220 K, reaction proven be fully reversible.