Effect of Substitution on the Hysteretic Phase Transition in a Bistable Phenalenyl‐Based Neutral Radical Molecular Conductor

The ability to tune the physical properties of bistable organic functional materials by means of chemistry can facilitate their development for molecular electronic switching components. The butylamine‐containing biphenalenyl boron neutral radical, [Bu]2B, crystalline compound has recently attracted...

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Bibliographic Details
Published in:Chemistry : a European journal 2019-03, Vol.25 (16), p.4166-4174
Main Authors: Stekovic, Dejan, Bag, Pradip, Shankhari, Pritam, Fokwa, Boniface P. T., Itkis, Mikhail E.
Format: Article
Language:English
Subjects:
bistable materials
Boron
Boron compounds
Chemistry
Collapse
Conductors
Crystal structure
Doping
Electrical conductivity
Electrical resistivity
Functional materials
Hysteresis
Hysteresis loops
Magnetic permeability
Magnetic properties
Magnetic susceptibility
molecular conductors
Optical bistability
Optical properties
Organic chemistry
Phase transitions
phenalenyl
Physical properties
radicals
Solid solutions
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Summary:The ability to tune the physical properties of bistable organic functional materials by means of chemistry can facilitate their development for molecular electronic switching components. The butylamine‐containing biphenalenyl boron neutral radical, [Bu]2B, crystalline compound has recently attracted significant attention by displaying a hysteretic phase transition accompanied by simultaneous bistability in magnetic, electrical, and optical properties close to room temperature. In this report, substitutional doping was applied to [Bu]2B by crystallizing solid solutions of bistable [Bu]2B and its non‐radical‐containing counterpart [Bu]2Be. With increasing doping degree, the hysteretic phase transition is gradually suppressed in terms of reducing the height, but conserves the width of the hysteresis loop as observed through magnetic susceptibility and electrical conductivity measurements. At the critical doping level of about 6 %, the abrupt transformation of the crystal structure to that of the pure [Bu]2Be crystal packing was observed, accompanied by a complete collapse of the hysteresis loop. Further study of the structure–properties relationships of bistable neutral radical conductors based on the [Bu]2B host can be conducted utilizing a variety of biphenalenyl‐based molecular conductors. A bistable butylamine‐containing biphenalenyl boron neutral radical, [Bu]2B, was substitutionally doped with its non‐radical containing counterpart, [Bu]2Be. The effects of the doping on the structure and bistable properties of [Bu]2B were investigated. At the critical doping of about 6 %, the abrupt transformation of the crystal structure to the pure [Bu]2Be crystal packing was observed together with a collapse of the hysteresis loop.
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.201805816