Browsing by Author "Tomioka, H."
Now showing items 1-10 of 10
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Connectivity Effects in Isomeric Naphthalenedinitrenes
Serwinski, P. R.; Walton, R.; Sanborn, J. A.; Lahti, P. M.; Enyo, T.; Miura, D.; Tomioka, H.; Nicolaïdes, Andrew N. (2001)(Matrix Presented) UV-vis, FTIR, and ESR spectroscopic studies were carried out on samples of 1,4- and 1,5-naphthalenediazide that were photolyzed at cryogenic temperatures in argon and frozen solvent matrices. Mononitrenes ...
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Direct observation and characterization of p-phenylenebisnitrene. A labile quinoidal diradical [11]
Nicolaïdes, Andrew N.; Tomioka, H.; Murata, S. (1998)
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Effect of angle strain in conjugated cycloaikenylidenes. Singlet- triplet splitting of cyclobutenylidene and its ground-state intramolecular rearrangements
Nicolaïdes, Andrew N.; Matsushita, Takashi; Tomioka, H. (1999)The singlet and triplet states of cyclobutenylidene, cyclopenten-3- ylidene, cyclohexen,3-ylidene, and cyclohepten-3-ylidene and some of their isomers (cyclohexen-4-ylidene, cyclohepten-4-ylidene, and cyclohepten-5- ylidene) ...
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The elusive benzocyclobutenylidene: A combined computational and experimental attempt
Nicolaïdes, Andrew N.; Matsushita, Takashi; Yonezawa, K.; Sawai, S.; Tomioka, H.; Stracener, L. L.; Hodges, J. A.; McMahon, R. J. (2001)Ab initio and density functional theory calculations predict that benzocyclobutenylidene (1) has a singlet ground state in contrast to the parent phenylcarbene and many other simply substituted arylcarbenes. Calculations ...
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Geometrically strained carbenes: Interdependence among geometry, spin multiplicity and reactivity
Takahashi, Y.; Nicolaïdes, Andrew N.; Tomioka, H. (2001)The singlet and triplet states of cyclobutenylidene 1 and benzocyclobutenylidene 2 have been studied computationally (using ab initio and DFT methods) in order to assess the effect of angle strain on the S-T gap of vinyl- ...
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Halogen derivatives of m-phenylene(carbeno)nitrene: A switch in ground-state multiplicity
Enyo, T.; Nicolaïdes, Andrew N.; Tomioka, H. (2002)m-Phenylene-coupled carbenonitrenes [(3-nitrenophenyl)methylene (2-H), (3-nitrenophenyl)fluoromethylene (2-F), (3-nitrenophenyl)chloromethylene (2-Cl), (3-nitrenophenyl)bromomethylene (2-Br)] have been investigated ...
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Hula-twist photoisomerization of a styrene derivative examined by argon-matrix-infrared-spectroscopic method
Nakane, N.; Nicolaïdes, Andrew N.; Tomioka, H.; Asato, A. E.; Liu, R. S. H. (2006)IR spectra of α-cyano- o -fluorocinnamonitrile, its vinyl deuterated analogue and the corresponding photoproducts were recorded under Ar matrix isolation conditions (13K). An analysis of the IR spectra, assisted by ...
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o-Phenylene halocarbenonitrenes and o-phenylene chlorocarbenocarbene: A combined experimental and computational approach
Enyo, T.; Arai, N.; Nakane, N.; Nicolaïdes, Andrew N.; Tomioka, H. (2005)Computations find that o-phenylene(halo)carbenonitrenes 2-XN, X = F, Cl, Br, have quinoidal singlet biradical ground states such as the parent o-phenylenecarbenonitrene (2-HN). Compared to the parent 2-HN, halogen substitution ...
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Of ortho-conjugatively linked reactive intermediates: The cases of ortho-phenylene-(bis)nitrene, -carbenonitrene, and -(bis)carbene
Nicolaïdes, Andrew N.; Nakayama, T.; Yamazaki, K.; Tomioka, H.; Koseki, S.; Stracener, L. L.; McMahon, R. J. (1999)ortho-Phenylene-bisnitrene (2) and -carbenonitrene (3) were generated in an inert matrix at low temperature, characterized by IR spectroscopy, and identified with the help of DFT calculations. Their thermal and photochemical ...
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p-phenylenecarbenonitrene and its halogen derivatives: How does resonance interaction between a nitrene and a carbene center affect the overall electronic configuration?
Nicolaïdes, Andrew N.; Enyo, T.; Miura, D.; Tomioka, H. (2001)A series of para-conjugatively coupled phenylenecarbenonitrenes {(4-nitrenophenyl)methylene (3a), (4-nitrenophenyl)fluoromethylene (3b), (4-nitrenophenyl)chloromethylene (3c), and (4-nitrenophenyl)bromomethylene (3d)} were ...