Abstract
New pentacoordinated paramagnetic bis-o-semiquinonato zinc complexes with different neutral ligands (3,6-SQ)2Zn·L 1–5 (where 3,6-SQ – 3,6-di-tert-butyl-o-semiquinonate anion, L=2,6-dimethyl-N-(thiophen-2-ylmethylene)aniline (L1) (1), 2,6-diisopropyl-N-(pyridin-4-ylmethylene)aniline (L2) (2), N-(pyridin-4-ylmethylene)aniline (L3) (3), 2-(4-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (L4) (4) and 4,4′-dipyridyl (L5) (5)) were synthesized. The crystal structures of compounds 1–3, 5 were investigated using X-ray diffraction. The coordination polyhedron of all complexes was found to be a distorted (τ=0–0.3) square pyramid. The measurements of magnetic susceptibilities show that all complexes are characterized by the intramolecular antiferromagnetic exchange between o-semiquinonate radical centers (J=−155.76(28), −53.56(18), −52.57(25), −80.67(27) and −85.77(91)K for 1–5 respectively). The magnitude of the magnetic exchange interactions between spins of semiquinonate ligands was found to be influenced by the radical separation distance. A smaller distance between radical centers leads to the increasing magnetic exchange interaction magnitude.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
