Re(i)-nitroxide complexes†
Kseniya
Maryunina, 
*a
Gleb
Letyagin,
ab
Artem
Bogomyakov,
abc
Sergey
Tumanov,
ab
Sergey
Veber,
ab
Matvey
Fedin,
ab
Evgeniya
Saverina,
c
Mikhail
Syroeshkin,
c
Galina
Romanenko
a
and
Victor
Ovcharenko
ac
*a
Gleb
Letyagin,
ab
Artem
Bogomyakov,
abc
Sergey
Tumanov,
ab
Sergey
Veber,
ab
Matvey
Fedin,
ab
Evgeniya
Saverina,
c
Mikhail
Syroeshkin,
c
Galina
Romanenko
a
and
Victor
Ovcharenko
ac
Abstract
Spin-labeled cyrhetrenes [(NNCp)Re(CO)3] and [(INCp)Re(CO)3], where NNCp is nitronyl nitroxide 2-(η5-cyclopentadienyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl and INCp is the corresponding imino nitroxide, were synthesized and characterized by EPR, CV, XRD, magnetochemistry and quantum chemistry methods. The correlations between different arrangements of paramagnetic centers and the magnetic exchange interactions for three polymorphs of [(NNCp)Re(CO)3] were studied. It was concluded that high kinetic stability of nitroxide-substituted cyrhetrenes is a promising feature of compounds for the creation of multifunctional contrast agents.
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