Raman Spectroscopy Shows Interchain through Space Charge Delocalization in a Mixed Valence Oligothiophene Cation and in Its π-Dimeric Biradicaloid Dication

2008 ◽  
Vol 130 (43) ◽  
pp. 14028-14029 ◽  
Author(s):  
Juan Casado ◽  
Kazuo Takimiya ◽  
Tetsuo Otsubo ◽  
Francisco J. Ramírez ◽  
J. Joaquín Quirante ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Space Charge ◽  
Mixed Valence ◽  
Charge Delocalization

Vicinal-diaryl interactions in stilbenoid hydrocarbons as observed in the through-space charge delocalization of their cation radicals

1999 ◽  
Vol 77 (5-6) ◽  
pp. 913-921 ◽  
Author(s):  
Rajendra Rathore ◽  
Jay K Kochi
Keyword(s):  
Space Charge ◽  
Cation Radical ◽  
Conformational Preference ◽  
Charge Delocalization ◽  
X Ray ◽  
X Ray Crystallography ◽  
Cation Radicals ◽  
Near Ir ◽  
Aromatic Interactions ◽  
Vis Spectroscopy

The conformational preference of vicinal or 1,2-phenyl groups is probed in two classes of ring-substituted 1,2-diphenylbicyclooctene (stilbenoid) hydrocarbons 1a-1d and 2a-2c. UV-vis spectroscopy reveals, and X-ray crystallography verifies, the intramolecular (edge-to-face) orientation for the phenyl-phenyl interaction in stilbenoids 1a-1d. Most importantly, when two pairs of ortho-methyl substituents are present, the cofacial phenyl groups in the stilbenoid donors are established by X-ray crystallography and spectrally observed in the cation radicals (2a+.-2c+.) by the appearance of new bands with strong absorptions in the near IR with λmax = 1100-1315 nm, analogous to those previously observed in intermolecular (aromatic) interactions of aromatic cation radicals.Key words: stilbenoid hydrocarbon, cation radical, aryl-aryl interaction.

scholarly journals Robin Jon Hawes Clark. 16 February 1935—6 December 2018

2020 ◽  
Vol 68 ◽  
pp. 103-129
Author(s):  
Alwyn G. Davies ◽  
Paul F. McMillan
Keyword(s):  
Raman Spectroscopy ◽  
Inorganic Compounds ◽  
Resonance Raman Spectroscopy ◽  
Linear Chain ◽  
Mixed Valence ◽  
Far Infrared ◽  
Vanadium Complexes ◽  
Coordination Numbers ◽  
Metal Metal ◽  
High Coordination

Robin Clark was a distinguished physical/inorganic chemist who made major discoveries in the coordination chemistry of the early transition metals, especially of titanium and vanadium complexes with high coordination numbers (notably seven and eight) and of the structures and physical properties of mixed valence, linear chain and metal–metal bonded compounds. He applied far-infrared spectroscopy to study metal–ligand vibrations systematically and established the technique for structure elucidation of transition metal and main group compounds. He also developed Raman and resonance Raman spectroscopy applied to inorganic compounds and highly coloured solids including mineral samples. That work led to his seminal applications of microbeam Raman spectroscopy for the identification of pigments and other constituents of artworks and historical artefacts, thereby developing a basis for testing their provenance and the identification of forgeries.

scholarly journals Charge Delocalization in Self-Assembled Mixed-Valence Aromatic Cation Radicals

Langmuir ◽  
2011 ◽  
Vol 28 (1) ◽  
pp. 71-83 ◽  
Author(s):  
Tushar S. Navale ◽  
Khushabu Thakur ◽  
Vijay S. Vyas ◽  
Shriya H. Wadumethrige ◽  
Ruchi Shukla ◽  
...  
Keyword(s):  
Mixed Valence ◽  
Charge Delocalization ◽  
Cation Radicals ◽  
Self Assembled

scholarly journals Charge Delocalization and Bulk Electronic Conductivity in the Mixed-Valence Metal–Organic Framework Fe(1,2,3-triazolate)2(BF4)x

2018 ◽  
Vol 140 (27) ◽  
pp. 8526-8534 ◽  
Author(s):  
Jesse G. Park ◽  
Michael L. Aubrey ◽  
Julia Oktawiec ◽  
Khetpakorn Chakarawet ◽  
Lucy E. Darago ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Electronic Conductivity ◽  
Mixed Valence ◽  
Charge Delocalization ◽  
Metal Organic ◽  
Organic Framework

Spectroscopic and electrochemical properties of ruthenium complexes with photochromic triarylamine–dithienylethene–acetylide ligands

2016 ◽  
Vol 3 (11) ◽  
pp. 1432-1443 ◽  
Author(s):  
Dao-Bin Zhang ◽  
Jin-Yun Wang ◽  
Denis Jacquemin ◽  
Zhong-Ning Chen
Keyword(s):  
Electrochemical Properties ◽  
Mixed Valence ◽  
Ruthenium Complexes ◽  
Progressive Increase ◽  
Charge Delocalization ◽  
System P ◽  
Molecular Backbone

The charge delocalization along the molecular backbone shows a progressive increase following stepwise photocyclization in the inorganic–organic mixed-valence system.

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