01648nas a2200181   4500008004100000022001400041245008600055210006900141260007100210300001600281490000800297520096300305100002001268700001501288700002601303700002101329856011601350       2015                        eng d  a1520-610600aFeasibility of ionization-mediated pathway for ultraviolet-induced melanin damage0 aFeasibility of ionizationmediated pathway for ultravioletinduced  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcOCT  a13288-132930 v1193 a<p>Melanin is the pigment found in human skin that is responsible for both photoprotection and photodamage. Recently there have been reports that greater photodamage of DNA occurs when cells containing melanin are irradiated with ultraviolet (UV) radiation, thus suggesting that the photoproducts of melanin cause DNA damage. Photoionization processes have also been implicated in the photodegradation of melanin. However, not much is known about the oxidation potential of melanin and its monomers. In this work we calculate the ionization energies of monomers, dimers, and few oligomers of eumelanin to estimate the threshold energy required for the ionization of eumelanin. We find that this threshold is within the UV-B region for eumelanin. We also look at the charge and spin distributions of the various ionized states of the monomers that are formed to understand which of the ionization channels might favor monomerization from a covalent dimer.</p>1 aMandal, Mukunda1 aDas, Tamal1 aGrewal, Baljinder, K.1 aGhosh, Debashree  uhttps://library.ncl.res.in/content/feasibility-ionization-mediated-pathway-ultraviolet-induced-melanin-damage-001375nas a2200205   4500008004100000022001400041245006500055210006300120260011000183300001400293490000700307520065500314100002600969700001900995700001401014700001501028700001701043700001901060856009001079       2016                        eng d  a1359-734500aFacile access to a Ge(II) dication stabilized by isocyanides0 aFacile access to a GeII dication stabilized by isocyanides  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcMAY  a7890-78920 v523 a<p>Herein, we introduce isocyanide as a ligand in main group chemistry and describe the facile isolation of a Ge(II) dication. The reaction of 2,6-dimethylphenylisocyanide with GeCl2 leads to the formation of a Ge(II) dication with two [GeCl3](-) molecules as counter anions. The dicationic Ge(II) center is bound to four isocyanide ligands and also holds a lone pair of electrons. DFT calculations reveal that the dication is stabilized only by sigma-donation from the four isocyanide ligands. Natural population analysis gives a charge of +0.74 on the Ge(II) center, indicating that the positive charge is shared by the isocyanide substituents.</p>1 aSwamy, V., S. V. S. N1 aYadav, Sandeep1 aPal, Shiv1 aDas, Tamal1 aVanka, Kumar1 aSen, Sakya, S.  uhttps://library.ncl.res.in/content/facile-access-geii-dication-stabilized-isocyanides