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- Title
N‐Alkylimidazol‐5‐yl‐substituted Nitronyl Nitroxides and Their Mononuclear Cu(II) Complexes: Synthesis, Structure and Magnetic Properties.
- Authors
Golomolzina, Irina V.; Tolstikov, Svyatoslav E.; Smirnova, Kristina A.; Fokin, Sergey V.; Letyagin, Gleb A.; Romanenko, Galina V.; Bogomyakov, Artem S.
- Abstract
A novel synthetic approach has been employed to synthesize a series of new nitronyl nitroxides: 2‐(1‐propyl‐1H‐imidazol‐5‐yl)‐ (Ln−Pr), 2‐(1‐isopropyl‐1H‐imidazol‐5‐yl)‐ (Li−Pr) and 2‐(1‐butyl‐1H‐imidazol‐5‐yl)‐4,4,5,5‐tetramethyl‐4,5‐dihydro‐1H‐imidazole‐3‐oxide‐1‐oxyl (Ln−Bu). The reaction of Cu(hfac)2 with LR in a 1 : 2 ratio yields mononuclear heterospin complexes [Cu(hfac)2(LR)2] (LR=Ln‐Pr, Li‐Pr, Ln‐Bu), which have a similar crystal structure to the "jumping" crystals [Cu(hfac)2(LMe)2] that exhibit chemomechanical activity. It was shown that an increase in the alkyl substituent R leads to changes in the crystal packing of the molecules and the absence of chemomechanical activity. Furthermore, it was found that two polymorph modifications of the heterospin complex [Cu(hfac)2(Ln−Pr)2] can be obtained, and magnetic properties of [Cu(hfac)2(Ln−Pr)2] strongly depend on the angle between the planes of the paramagnetic fragment O•–N‐C=N→O and the imidazole ring in Ln−Pr.
- Subjects
MAGNETIC structure; COPPER; MAGNETIC properties; NITROXIDES; CRYSTAL structure; COPPER compounds
- Publication
Chemistry - A European Journal, 2024, Vol 30, Issue 13, p1
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.202303499