Spin Transition in the Cu(hfac)2 Complex with (4-Ethylpyridin-3-yl)-Substituted Nitronyl Nitroxide Caused by the “Asymmetric” Structural Rearrangement of Exchange Clusters in the Heterospin Molecule

Methods for the synthesis of binuclear [Cu(hfac)2LEt]2 and tetranuclear [[Cu(hfac)2]4(LEt)2] heterospin compounds based on copper hexafluoroacetylacetonate [Cu(hfac)2] and 2-(4-ethylpyridin-3-yl)-4,5-bis(spirocyclopentyl)-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl (LEt), were developed. The crystals of...

Full description

Saved in:
Bibliographic Details
Published in:Crystals (Basel) 2019-06, Vol.9 (6), p.285
Main Authors: Artiukhova, Natalia, Romanenko, Galina, Letyagin, Gleb, Bogomyakov, Artem, Veber, Sergey, Minakova, Olga, Petrova, Marina, Morozov, Vitaliy, Ovcharenko, Victor
Format: Article
Language:English
Subjects:
Chemical synthesis
Clusters
Cooling curves
Copper
Coupling
Coupling (molecular)
Crystal structure
Cu(II) complexes
Heat exchange
Heating
Hysteresis loops
Imidazole
Low temperature
magnetostructural correlations
nitroxides
phase transitions
Single crystals
spin crossover
Spin transition
Temperature
Twinning
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Methods for the synthesis of binuclear [Cu(hfac)2LEt]2 and tetranuclear [[Cu(hfac)2]4(LEt)2] heterospin compounds based on copper hexafluoroacetylacetonate [Cu(hfac)2] and 2-(4-ethylpyridin-3-yl)-4,5-bis(spirocyclopentyl)-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl (LEt), were developed. The crystals of the complexes are elastic and do not crash during repeated cooling–heating cycles. It was found that a singlet–triplet conversion occurred in all of the {Cu(II)–O•–NN–•O–Cu2+} terminal exchange clusters, leading to spin compensation for only two paramagnetic centers of the six centers in the molecule.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst9060285