The Diamagnetic Sucseptibilities and Anisotropies of the Polynuclear Aromatic Compounds

Autor:	Hideo Akamatu, Yoshio Matsunaga
Rok vydání:	1953
Předmět:	Violanthrone biology Stereochemistry Pyranthrene Condensation General Chemistry Conjugated system biology.organism_classification chemistry.chemical_compound Crystallography chemistry Excited state Molecule Diamagnetism Anisotropy
Zdroj:	Bulletin of the Chemical Society of Japan. 26:364-372
ISSN:	1348-0634 0009-2673
DOI:	10.1246/bcsj.26.364
Popis:	The magnetic susceptibilities of condensed polynuclear aromatic compounds with higher molecular weights (ten hydrocarbons and twelve quinones) have been measured by the Gouy method, and the diamagnetic anisotropies have been approximately evaluated. The diamagnetic anisotropy becomes progressively large as the number of rings increases, when the aromatic condensation takes place in the manner of the closely compact arrangement of rings; while, when it is not the case, it depends strikingly upon the molecular structure. When the diamagnetic anisotropy has a smaller value, notwithstanding the molecule is made of a large number of rings, the localization of the π-electrons or some other excited states must be assumed. Such a case is found, when a molecule is not made of the aromatically conjugated system as a whole but separated into two predominant nuclei, as meso-naphthodianthrene and violanthrone, or when a molecule is made of a long shaped structure as pyranthrene or violanthrene.
Databáze:	OpenAIRE
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