22702-76-7Relevant articles and documents
Single-Molecule Conductance in Atomically Precise Germanium Wires
Su, Timothy A.,Li, Haixing,Zhang, Vivian,Neupane, Madhav,Batra, Arunabh,Klausen, Rebekka S.,Kumar, Bharat,Steigerwald, Michael L.,Venkataraman, Latha,Nuckolls, Colin
supporting information, p. 12400 - 12405 (2015/10/12)
While the electrical conductivity of bulk-scale group 14 materials such as diamond carbon, silicon, and germanium is well understood, there is a gap in knowledge regarding the conductivity of these materials at the nano and molecular scales. Filling this gap is important because integrated circuits have shrunk so far that their active regions, which rely so heavily on silicon and germanium, begin to resemble ornate molecules rather than extended solids. Here we unveil a new approach for synthesizing atomically discrete wires of germanium and present the first conductance measurements of molecular germanium using a scanning tunneling microscope-based break-junction (STM-BJ) technique. Our findings show that germanium and silicon wires are nearly identical in conductivity at the molecular scale, and that both are much more conductive than aliphatic carbon. We demonstrate that the strong donor ability of C-Ge I-bonds can be used to raise the energy of the anchor lone pair and increase conductance. Furthermore, the oligogermane wires behave as conductance switches that function through stereoelectronic logic. These devices can be trained to operate with a higher switching factor by repeatedly compressing and elongating the molecular junction.
Reactions of organochlorosilanes with chloro-and organogermanes in the presence of aluminum chloride
Zhun,Sbitneva,Polivanov,Chernyshev
, p. 1564 - 1570 (2008/02/09)
The effect of substituents at the silicon and germanium atoms in reactions of organochlorosilanes with chloro-and organogermanes in the presence of aluminum chloride was studied. The only occurring process is the exchange of the chlorine atoms at Ge for the phenyl groups from Si; an increase in the number of methyl groups or chlorine atoms at Si promotes formation of phenyltrichlorogermane, and an increase in the number of phenyl groups or replacement of the chlorine atom at the Si atom by hydrogen leads to the formation of di-and triphenylchlorogermanes. Neither phenyl nor other radicals are transferred back from Ge to Si in the course of reactions of phenylgermanes with methylchlorosilanes in the presence of aluminum chloride; the only occurring processes are the exchange of the phenyl or methyl radicals bonded to Ge for the Cl atom bonded to Al and the disproportionation of phenylchlorogermanes. Nauka/Interperiodica 2006.
Digermylplatinum(II) organometallic rings L2PtGe(Me2)EGeMe2 [E = N-, O, S, (η-C5H4)2Fe]
Barrau,Rima,Cassano,Satgé
, p. 5700 - 5703 (2008/10/09)
The synthesis, reactivity, and characterization of the digermylplatinum(II) linear complexes (ClMe2Ge)2Pt(PPh3)2 (1) and (ClMe2Ge)2Pt(diphos) (2) and cyclic complexes (diphos)PtGe-(Me2)EGeMe2 [E = S (3), -NPh (4), (η5-C5H4)Fe(η5-C 5H4) (5), O (6)] are reported. The chemistry of 2-6 is illustrated through their reactions with phenylacetylene and N-methyltriazolinedione. Complexes 3 and 6 give double germylation of these unsaturated systems, while 2, by reaction with triazolinedione, gives the monogermylated complex Me2-(Cl)GePt(Cl)diphos and the dimer of the germylated heterocycle Me2GeNC(O)N(Me)C(O)N.
Photochemical reactions of aryl-substituted catenates of group 4B elements, PhMe2E-E'Me3 (E, E' = Si and Ge). Formation of a radical pair
Mochida, Kunio,Kikkawa, Haruhiko,Nakadaira, Yasuhiro
, p. 9 - 19 (2007/10/02)
Photochemical reactions of phenyl substituted catenates of group 4B elements, PhMe2E-E'Me3 (E, E' = Si and Ge) have been investigated by chemical trapping experiments and laser flash-photolysis.On irradiation, the phenylated group 4B catenate undergoes E-E' bond homolysis to give a pair of radicals (PhMe2E. and Me3E'.).In CCl4, these radicals are converted to the corresponding chlorides by abstraction of a chlorine atom.In a nonhalogenated solvent, the radical pair couples at the ipso-position of the phenyl group of the pairing radical (PhMe2E.) to yield the cor responding diradical.This undergoes either elimination of a divalent species (Me2E:) with concomitant formation of trimethylphenyl group 4B element PhMe3E') or intramolecular 1,2-group 4B element migration to yield group 4B metal-carbon double bonded species.The radical escapes from the solvent cage coupled to the metal atom of the radical to yield the dimetallic product.The reaction path observed is highly dependent on the nature of the group 4B element comprising the phenyl substituted catenate.
Photochemical Reactions of Aryl-Substituted Digermanes through a Pair of Organogermyl Radicals
Mochida, Kunio,Wakasa, Masanobu,Sakaguchi, Yoshio,Hayashi, Hisaharu
, p. 1889 - 1895 (2007/10/02)
The photochemical reactions of aryl-substituted digermanes were investigated by trapping experiments and a laser flash photolysis technique.The photolysis of phenylated digermanes resulted in germanium-germanium bond homolysis to give a pair of two germyl radicals.The germyl radicals abstracted a chlorine atom from carbon tetrachloride to give chlorogermanes.The pair of germyl radicals also underwent ipso-substitution, which was a precursor of the germylenes.The mechanism for the photochemistry of phenylated digermenes is discussed.
Palladium-Catalyzed Germylation of Organic Halides with a Digermane. Unexpected Formation of Germylene-Insertion Type Products
Reddy, Prabhakar N.,Hayashi, Teruyuki,Tanaka, Masato
, p. 677 - 680 (2007/10/02)
Organic halides (RX) underwent dehalogenative germylation and germylene insertion type reactions with ClMe2GeGeMe2Cl in the presence of Pd(PPh3)4 as catalyst to give RGeMe2Cl and RGeMe2X respectively.
Photochemistry of aryl-substituted trigermanes. Generation and mechanism of formation of germylenes
Mochida, Kunio,Yoneda, Isao,Wakasa, Masanobu
, p. 53 - 62 (2007/10/02)
Photochemical reactions of aryl-substituted trigermanes have studied by trapping experiments, matrix isolation, and laser flash-photolysis techniques.Photolysis of the phenylated trigermanes involved both the simple extrusion of germylenes and the formati
Photochemistry of aryl-substituted trigermanes
Wakasa, Masanobu,Yoneda, Isao,Mochida, Kunio
, p. C1 - C5 (2007/10/02)
The photolysis of phenyl-substituted trigermanes affords digermanes and germenylenes.Trapping experiments, matrix isolation, and laser-photolysis studies indicate that the photoreaction of these compounds involves both the extrusion of germylenes and the
Laser photolysis of aryl-substituted digermanes. Generation of germyl radicals and germylenes
Mochida, Kunio,Wakasa, Masanobu,Nakadaira, Yasuhiro,Sakaguchi, Yoshio,Hayashi, Hisaharu
, p. 1869 - 1871 (2008/10/08)
Laser flash photolysis of the phenyl-substituted digermanes (PhnMe3-nGe)2 results in Ge-Ge bond homolysis to give germyl radicals and probably a germylene.
