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Cascade sensing of gold and thiols with imidazole-bearing functional porphyrins
Kim, Joo-Ho,Jeong, Young-Hwan,Yoon, Hee-Jae,Tran, Helen,Campos, Luis M.,Jang, Woo-Dong The Royal Society of Chemistry 2014 Chemical communications Vol.50 No.78
<P>An imidazole-bearing zinc porphyrin (<B>P<SUB>Zn</SUB></B>) has been designed for the selective detection of Au<SUP>3+</SUP>, and the porphyrin and gold complex (<B>P<SUB>Zn</SUB></B>·Au<SUP>3+</SUP>) can additionally be used to identify gold-binding functional groups such as cysteine residues and other mercaptans.</P> <P>Graphic Abstract</P><P>An imidazole-bearing zinc porphyrin (<B>P<SUB>Zn</SUB></B>) has been designed for the selective detection of Au<SUP>3+</SUP>, and the porphyrin and gold complex (<B>P<SUB>Zn</SUB></B>·Au<SUP>3+</SUP>) can additionally be used to identify gold-binding functional groups such as cysteine residues and other mercaptans. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc05261g'> </P>
A facile route to ketene-functionalized polymers for general materials applications
Leibfarth, Frank A.,Kang, Minhyuk,Ham, Myungsoo,Kim, Joohee,Campos, Luis M.,Gupta, Nalini,Moon, Bongjin,Hawker, Craig J. Nature Publishing Group 2010 Nature chemistry Vol.2 No.3
Function matters in materials science, and methodologies that provide paths to multiple functionality in a single step are to be prized. Therefore, we introduce a robust and efficient strategy for exploiting the versatile reactivity of ketenes in polymer chemistry. New monomers for both radical and ring-opening metathesis polymerization have been developed, which take advantage of Meldrum's acid as both a synthetic building block and a thermolytic precursor to dialkyl ketenes. The ketene-functionalized polymers are directly detected by their characteristic infrared absorption and are found to be stable under ambient conditions. The inherent ability of ketenes to provide crosslinking via dimerization and to act as reactive chemical handles via addition, provides simple methodology for application in complex materials challenges. Such versatile characteristics are illustrated by covalently attaching and patterning a dye through microcontact printing. The strategy highlights the significant opportunities afforded by the traditionally neglected ketene functional group in polymer chemistry.
進行乳癌에 대한 術後의 多劑·免疫·化學療法 : Fluorouracil. Doxorubicin Cyclophosphamide, BCG 백신
Buzdar, Aman U.,Blumenschein, George R.,Gutterman, Jordan,Tashima, Charles K.,Hortobagyi, Gabriel N.,Smith, Terry L.,Campos, Luis T.,Wheeler, Warren L.,Hersh, Evan M.,Freireich, Emil J.,Gehan, Edmund 藥業新聞社 1980 (月刊) 醫藥情報 Vol.1980 No.5
Control of Single-Molecule Junction Conductance of Porphyrins via a Transition-Metal Center
Liu, Zhen-Fei,Wei, Sujun,Yoon, Hongsik,Adak, Olgun,Ponce, Ingrid,Jiang, Yivan,Jang, Woo-Dong,Campos, Luis M.,Venkataraman, Latha,Neaton, Jeffrey B. American Chemical Society 2014 NANO LETTERS Vol.14 No.9
<P>Using scanning tunneling microscope break-junction experiments and a new first-principles approach to conductance calculations, we report and explain low-bias charge transport behavior of four types of metal–porphyrin–gold molecular junctions. A nonequilibrium Green’s function approach based on self-energy corrected density functional theory and optimally tuned range-separated hybrid functionals is developed and used to understand experimental trends quantitatively. Importantly, due to the localized d states of the porphyrin molecules, hybrid functionals are essential for explaining measurements; standard semilocal functionals yield qualitatively incorrect results. Comparing directly with experiments, we show that the conductance can change by nearly a factor of 2 when different metal cations are used, counter to trends expected from gas-phase ionization energies which are relatively unchanged with the metal center. Our work explains the sensitivity of the porphyrin conductance with the metal center via a detailed and quantitative portrait of the interface electronic structure and provides a new framework for understanding transport quantitatively in complex junctions involving molecules with localized d states of relevance to light harvesting and energy conversion.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-9/nl5025062/production/images/medium/nl-2014-025062_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl5025062'>ACS Electronic Supporting Info</A></P>