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Synthesis and Magnetic Properties of Stable Radical Derivatives Carrying a Phenylacetylene Unit
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Synthesis and Magnetic Properties of Stable Radical Derivatives Carrying a Phenylacetylene Unit
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Journal Article
Synthesis and Magnetic Properties of Stable Radical Derivatives Carrying a Phenylacetylene Unit
2018
Overview
A nitronyl nitroxide derivative, 2-phenylethynyl-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-1-oxyl-3-oxide (1), and two verdazyl derivatives carrying a phenylacetylene unit, 1,5-diphenyl-3-phenylethynyl-6-oxo-1,2,4,5-tetrazin-2-yl (2) and 1,5-diisopropyl-3-phenylethynyl-6-oxo-1,2,4,5-tetrazin-2-yl (3), were synthesized and their packing structures were studied by X-ray crystallographic analysis and magnetically characterized in the solid state. While 1 and 3 had an isolated doublet spin state, 2 formed an antiferromagnetically coupled pair (2J/kB = −118 K). Density functional theory (DFT) calculations reveal that the spin density polarized in the phenyl group decreases as the dihedral angle between the phenyl ring and radical plane increases.
Publisher
MDPI AG,MDPI
