http://publicationslist.org/data/jin.wang/atom.xml Jin Wanghttp://publicationslist.org/jin.wang$basepathfavicon.icoRecent additions to Jin Wang's PublicationsList.org pagehttp://publicationslist.org/publications.png2008-07-25T02:34:58Z http://publicationslist.org/jin.wang/refid5 2008-07-25T02:31:54Z

Time-resolved resonance Raman (TR3) studies of the photochemistry of phenyl azide, 3-hyroxyphenyl azide, 3-methoxyphenyl azide and 3-nitrophenyl azide in acetonitrile:water solutions is reported. After photolysis of these four aryl azides in room temperature solutions, only one species was observed in the TR3 spectra for each azide, respectively at the probe wavelengths employed in the TR3 experim...<br/><br/>Jiadan Xue, Yong Du, Yung Ping Chuang, David Lee Phillips, Jin Wang, Calvin Luk, Christopher M Hadad, Matthew S Platz (2008) <i>J Phys Chem A</i> <i></i> <i></i> 112: 7 1502-1510<br/>

http://publicationslist.org/jin.wang/refid6 2008-07-25T02:31:54Z

Ultrafast photolysis (lambda(ex) = 308 nm) of p-biphenylyltrifluoromethyl diazomethane (BpCN2CF3) releases singlet p-biphenylyltrifluoromethylcarbene (BpCCF3) which absorbs strongly at 385 nm in cyclohexane, immediately after the 300 fs laser pulse. The initial absorption maximum shifts to longer wavelengths in coordinating solvents (nitrile, ether, and alcohol). In low viscosity coordinating solv...<br/><br/>Jin Wang, Jacek Kubicki, Terry L Gustafson, Matthew S Platz (2008) <i>J Am Chem Soc</i> <i></i> <i></i> 130: 7 2304-2313<br/>

http://publicationslist.org/jin.wang/refid3 2008-07-25T02:31:54Z

Jin Wang, Gotard Burdzinski, Jacek Kubicki, Terry L Gustafson, Matthew S Platz (2008) <i>J Am Chem Soc</i> <i></i> <i></i> 130: 16 5418-5419<br/>

http://publicationslist.org/jin.wang/refid4 2008-07-25T02:31:54Z

Photoinduced Wolff rearrangements were studied by femtosecond time-resolved UV-vis and IR transient absorption spectroscopy. For BpCN2COCH3 in acetonitrile the IR data indicate the presence of at least two mechanisms of ketene formation. The first process is fast proceeding in either 1BpCN2COCH3*, or in a hot carbene, or in both species, while the second is slow proceeding through the intermediacy...<br/><br/>Gotard T Burdzinski, Jin Wang, Terry L Gustafson, Matthew S Platz (2008) <i>J Am Chem Soc</i> <i></i> <i></i> 130: 12 3746-3747<br/>

http://publicationslist.org/jin.wang/refid2 2008-07-25T02:31:54Z

The influence of coordinating solvents on singlet-to-triplet carbene intersystem crossing (ISC) rates has been studied with diphenylcarbene (DPC) and para-biphenyltrifluoromethylcarbene (BpCCF 3) by using ultrafast time-resolved spectroscopy. DPC has a triplet ground state in all of the solvents considered, and the concentration of singlet carbene at equilibrium is too small to be measured. It is ...<br/><br/>Jin Wang, Jacek Kubicki, Huolei Peng, Matthew S Platz (2008) <i>J Am Chem Soc</i> <i></i> <i></i> 130: 20 6604-6609<br/>

http://publicationslist.org/jin.wang/refid1 2008-07-25T02:31:54Z

The photochemistry of 5-diazo-10,11-dihydrodibenzo[a,d]diazocycloheptene (DDBC) and 9-diazoanthrone (DAN) were studied by ultrafast time resolved techniques. The excited states of these diazo compounds were observed by UV-Vis spectroscopy and were found to decay in 300 fs. The diazo excited state decays led to the appearance and first direct observation of singlet 5-diazo-10,11-dihydrodibenzo[a,d]...<br/><br/>Jin Wang, Yunlong Zhang, Jacek Kubicki, Matthew S Platz (2008) <i>Photochem Photobiol Sci</i> <i></i> <i></i> 7: 5 552-557<br/>

http://publicationslist.org/jin.wang/refid8 2008-07-25T02:31:54Z

Laser flash photolysis of the quinol ester 2b in O2-saturated aqueous phosphate buffer at pH 7.1 with excitation at 266 nm generates a transient intermediate with lambda(max) 460 nm that decays in a first-order manner with an aqueous solution lifetime of (170 +/- 10) ns at 22 degrees C. This intermediate is not affected by O2, but reacts rapidly with N3- with an apparently diffusion-limited rate c...<br/><br/>Yue-Ting Wang, Jin Wang, Matthew S Platz, Michael Novak (2007) <i>J Am Chem Soc</i> <i></i> <i></i> 129: 47 14566-14567<br/>

http://publicationslist.org/jin.wang/refid7 2008-07-25T02:31:54Z

The rate of protonation of singlet 2-fluorenylnitrene was studied in eight protic solvents. The protonation rates vary between 10(11) and 10(9) s(-1) and are well-correlated with Swain's acity parameters. This demonstrates that Swain acity parameters and nitrene protonation rates can be used to evaluate bulk solvent acidity.<br/><br/>Jin Wang, Gotard Burdzinski, Matthew S Platz (2007) <i>Org Lett</i> <i></i> <i></i> 9: 25 5211-5214<br/>

http://publicationslist.org/jin.wang/refid9 2008-07-25T02:31:54Z

Ultrafast photolysis of 9-diazofluorene (DAF) produces a broadly absorbing transient within the instrument time resolution (300 fs), which is assigned to an excited state of the diazo compound. The diazo excited state fragments to form fluorenylidene (Fl) in both its lowest energy singlet state (1Fl, 405-430 nm, depending on the solvent) and a higher energy singlet state (370 nm, 1Fl*). The excite...<br/><br/>Jin Wang, Jacek Kubicki, Edwin F Hilinski, Sandra L Mecklenburg, Terry L Gustafson, Matthew S Platz (2007) <i>J Am Chem Soc</i> <i></i> <i></i> 129: 44 13683-13690<br/>

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Exposure of 2-naphthyl azide in acetonitrile at ambient temperature to femtosecond pulses of 266 nm light produces a transient absorption with maxima at 350 and 420 nm. The carrier of the 350 nm band decays more rapidly than that of the 420 nm band which has a lifetime of 1.8 ps. Analogous experiments with 1-chloro-2-naphthyl azide in methanol allow the assignment of the 350 nm band to a singlet e...<br/><br/>Jin Wang, Jacek Kubicki, Gotard Burdzinski, John C Hackett, Terry L Gustafson, Christopher M Hadad, Matthew S Platz (2007) <i>J Org Chem</i> <i></i> <i></i> 72: 20 7581-7586<br/>

http://publicationslist.org/jin.wang/refid12 2008-07-25T02:31:54Z

p-biphenylyl, o-biphenylyl, and 1-naphthyl azides were deposited in argon at low temperature in the presence and absence of HCl. In the absence of HCl, the known electronic and vibrational spectra of the corresponding triplet nitrenes, azirines, and didehydroazepines were observed, whereas in the presence of HCl, photolysis of these azides produces new electronic spectra assigned to the correspond...<br/><br/>Jin Wang, Gotard Burdzinski, Zhendong Zhu, Matthew S Platz, Claudio Carra, Thomas Bally (2007) <i>J Am Chem Soc</i> <i></i> <i></i> 129: 26 8380-8388<br/>

http://publicationslist.org/jin.wang/refid13 2008-07-25T02:31:54Z

Ultrafast photolysis of p-biphenylyldiazoethane (BDE) produces an excited state of the diazo compound in acetonitrile, cyclohexane, and methanol with lambdamax = 490 nm and lifetimes of less than 300 fs. The decay of the diazo excited state correlates with the growth of singlet carbene absorption at 360 nm. The optical yields of diazo excited states produced by photolysis of p-biphenylyldiazometha...<br/><br/>Jin Wang, Gotard Burdzinski, Terry L Gustafson, Matthew S Platz (2007) <i>J Am Chem Soc</i> <i></i> <i></i> 129: 9 2597-2606<br/>

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Ultrafast photolysis (lambda(ex) = 308 nm) of phenyl azide in 100% formic acid produces a broadly absorbing transient within the instrument time resolution (300 fs), which is assigned to an excited state of the azide. The azide excited state fragments within 300 fs to form singlet phenylnitrene. The decay of the nitrene (tau = 12.0 ps) produces a new species with absorption centered at 500 nm, whi...<br/><br/>Jin Wang, Jacek Kubicki, Matthew S Platz (2007) <i>Org Lett</i> <i></i> <i></i> 9: 20 3973-3976<br/>

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p-Biphenylyldiazomethane was excited by femtosecond pulses of UV light in acetonitrile, in cyclohexane, and in methanol. Ultrafast photolysis produces a singlet excited state of p-biphenylyldiazomethane with lambdamax = 490 nm, and lifetimes of less than 300 fs in acetonitrile, in cyclohexane, and in methanol. The decay of the excited state is accompanied by the growth of transient absorption with...<br/><br/>Jin Wang, Gotard Burdzinski, Terry L Gustafson, Matthew S Platz (2006) <i>J Org Chem</i> <i></i> <i></i> 71: 16 6221-6228<br/>

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The photochemistry of para- and ortho-biphenylyl azides and 1-naphthyl azide was studied by ultrafast spectroscopy. In every case, the singlet azide second excited states were observed by transient absorption spectroscopy and were found to have lifetimes of hundreds of femtoseconds. The decay of the S(2) states of the azides was accompanied by the growth of transient absorption of the correspondin...<br/><br/>Gotard Burdzinski, John C Hackett, Jin Wang, Terry L Gustafson, Christopher M Hadad, Matthew S Platz (2006) <i>J Am Chem Soc</i> <i></i> <i></i> 128: 41 13402-13411<br/>

http://publicationslist.org/jin.wang/refid14 2008-07-25T02:31:54Z

Ultrafast photolysis (lambdaex = 270, 350, or 360 nm) of bromophenyl, chlorophenyl, fluorophenyl, and fluoro-para-trifluoromethylphenyl diazirines produces transient species which absorb broadly in the UV and visible regions. Transient decay can be fit to either mono- or biexponential functions (tau1 approximately 0.3-10 ps, tau2 approximately 10-350 ps; dependent on solvent and halogen). Fluoro- ...<br/><br/>Jin Wang, Gotard Burdzinski, Jacek Kubicki, Matthew S Platz, Robert A Moss, Xiaolin Fu, Piotr Piotrowiak, Mykhaylo Myahkostupov (2006) <i>J Am Chem Soc</i> <i></i> <i></i> 128: 51 16446-16447<br/>

http://publicationslist.org/jin.wang/refid17 2008-07-25T02:34:22Z

A hairpin polyamide-chlorobenzenesulfonyl conjugate was synthesized in solution by a haloform reaction and the dicyclohexylcarbodiimide/1-hydroxybenzotriazole (DCC/HOBT) coupling reaction. Its ability to cleave DNA was investigated with supercoiled DNA (pBluescript SK), and the DNA cleaving efficiency of chlorobenzenesulfonyl group was enhanced by the hairpin polyamide under UV irradiation (365 nm...<br/><br/>Fei Li Tang, Gu Yuan, Jin Wang (2003) <i>Photochem Photobiol</i> <i></i> <i></i> 78: 2 175-179<br/>

http://publicationslist.org/jin.wang/refid18 2008-07-25T02:34:22Z

The electrospray ionization tandem mass spectrometric (ESI-MS/MS) characteristics and fragmentation mechanisms of eight distamycin analogues containing N-methylpyrrole and N-methylimidazole were investigated. The members of two isomeric groups of distamycin analogues with the same elemental composition can be distinguished by MS/MS spectra of protonated molecules and of significant fragment ions.<br/><br/>Feili Tang, Jin Wang, Dan Liu, Gu Yuan, Yen Liu, Chang Jin Zhu, Yu Fen Zhao (2002) <i>Rapid Commun Mass Spectrom</i> <i></i> <i></i> 16: 11 1035-1039<br/>