InChI=1S/C4H12Ge/c1-5(2,3)4/h1-4H3 |
ZRLCXMPFXYVHGS-UHFFFAOYSA-N |
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NMR chemical shift reference compound
Any compound that produces a peak used as reference frequency in the delta chemical shift scale.
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NMR chemical shift reference compound
Any compound that produces a peak used as reference frequency in the delta chemical shift scale.
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View more via ChEBI Ontology
(CH3)4Ge
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NIST Chemistry WebBook
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Ge(CH3)4
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ChEBI
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Me4Ge
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ChEBI
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tetramethyl germanium
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ChEBI
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tetramethylgermanium
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NIST Chemistry WebBook
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865-52-1
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CAS Registry Number
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NIST Chemistry WebBook
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Stefanowska-Tur S, Możejko P, Ptasińska-Denga E, Szmytkowski C (2019) Electron collisions with X(CH3)4 molecules (X = C, Si, Ge). The Journal of chemical physics 150, 094303 [PubMed:30849877] [show Abstract] Absolute grand-total cross sections (TCSs) for electron scattering from tetramethylmethane [C(CH3)4], tetramethylsilane [Si(CH3)4], and tetramethylgermane [Ge(CH3)4] molecules have been measured at electron-impact energies extending from around 0.5 to 300 eV in the linear electron-transmission experiment. The measured TCS energy dependences show very pronounced broad enhancement, peaking near 5.5 eV for Si(CH3)4 and Ge(CH3)4 molecules and around 6.5 eV for C(CH3)4. Additional weak structures are also located at higher electron energies. We attributed the TCS features to the resonant processes involved in the electron-molecule scattering. To examine the role of permethylation in the scattering, the measured TCS energy functions for X(CH3)4 compounds (X = C, Si, Ge) have been compared to the TCS curves for XH4 molecules. Additionally, the integral elastic cross section (ECS) and ionization cross section (ICS) have been calculated from intermediate to high electron-impact energies using model methods. At energies above 50 eV, the sum of ECS and ICS for the investigated targets is in satisfactory agreement with the respective measured TCS. The computed ECS+ICS values can be used as rough estimation of TCS at energies above 300 eV. | Cho YJ, Kim CH, Im HS, Myung Y, Kim HS, Back SH, Lim YR, Jung CS, Jang DM, Park J, Lim SH, Cha EH, Bae KY, Song MS, Cho WI (2013) Germanium-tin alloy nanocrystals for high-performance lithium ion batteries. Physical chemistry chemical physics : PCCP 15, 11691-11695 [PubMed:23753000] [show Abstract] Germanium-tin (Ge(1-x)Sn(x)) alloy nanocrystals were synthesized using a gas-phase laser photolysis reaction of tetramethyl germanium and tetramethyl tin. A composition tuning was achieved using the partial pressure of precursors in a closed reactor. For x < 0.1, cubic phase alloy nanocrystals were exclusively produced without separation of the tetragonal phase Sn metal. In the range of x = 0.1-0.4, unique Ge(1-x)Sn(x)-Sn alloy-metal hetero-junction nanocrystals were synthesized, where the Sn metal domain becomes dominant with x. Thin graphitic carbon layers usually sheathed the nanocrystals. We investigated the composition-dependent electrochemical properties of these nanocrystals as anode materials of lithium ion batteries. Incorporation of Sn (x = 0.05) significantly increased the capacities (1010 mA h g(-1) after 50 cycles) and rate capabilities, which promises excellent electrode materials for the development of high-performance lithium batteries. | Wolf AK, Glinnemann J, Fink L, Alig E, Bolte M, Schmidt MU (2010) Predicted crystal structures of tetramethylsilane and tetramethylgermane and an experimental low-temperature structure of tetramethylsilane. Acta crystallographica. Section B, Structural science 66, 229-236 [PubMed:20305357] [show Abstract] No crystal structure at ambient pressure is known for tetramethylsilane, Si(CH(3))(4), which is used as a standard in NMR spectroscopy. Possible crystal structures were predicted by global lattice-energy minimizations using force-field methods. The lowest-energy structure corresponds to the high-pressure room-temperature phase (Pa3, Z = 8). Low-temperature crystallization at 100 K resulted in a single crystal, and its crystal structure has been determined. The structure corresponds to the predicted structure with the second lowest energy rank. In X-ray powder analyses this is the only observed phase between 80 and 159 K. For tetramethylgermane, Ge(CH(3))(4), no experimental crystal structure is known. Global lattice-energy minimizations resulted in 47 possible crystal structures within an energy range of 5 kJ mol(-1). The lowest-energy structure was found in Pa3, Z = 8. | Zhao Y, Ng HT, Hanson E, Dong J, Corti DS, Franses EI (2010) Computation of Nonretarded London Dispersion Coefficients and Hamaker Constants of Copper Phthalocyanine. Journal of chemical theory and computation 6, 491-498 [PubMed:26617304] [show Abstract] A time-dependent density functional theory (TDDFT) scheme has been validated for predictions of the dispersion coefficients of five molecules (H2O, NH3, CO2, C6H6, and pentane) and for predictions of the static dipole polarizabilities of three organometallic compounds (TiCl4, OsO4, and Ge(CH3)4). The convergence of grid spacing has been examined, and two types of pseudopotentials and 13 density functionals have been tested. The nonretarded Hamaker constants A11 are calculated by employing a semiempirical parameter a along with the standard Hamaker constant equation. The parameter a is optimized against six accurate Hamaker constants obtained from the full Lifshitz theory. The dispersion coefficients of copper phthalocyanine CuPc and CuPc-SO3H are then computed. Using the theoretical densities of ρ1 = 1.63 and 1.62 g/cm(3), the Hamaker constants A11 of crystalline α-CuPc and β-CuPc are found to be 14.73 × 10(-20) and 14.66 × 10(-20) J, respectively. Using the experimentally derived density of ρ1 = 1.56 g/cm(3) for a commercially available β-CuPc (nanoparticles of ∼90 nm hydrodynamic diameter), A11 = 13.52 × 10(-20) J is found. Its corresponding effective Hamaker constant in water (A121) is calculated to be 3.07 × 10(-20) J. All computed A11 values for CuPc are noted to be higher than those reported previously. | Davalos JZ, Koizumi H, Baer T (2006) Threshold photoelectron-photoion coincidence spectroscopy: dissociation dynamics and thermochemistry of Ge(CH3)4, Ge(CH3)3Cl, and Ge(CH3)3Br. The journal of physical chemistry. A 110, 5032-5037 [PubMed:16610821] [show Abstract] Threshold photoelectron-photoion coincidence spectroscopy (TPEPICO) has been used to investigate the gas-phase ionic dissociation energies and thermochemistry of Me4Ge and Me3GeX, (Me = methyl; X = Cl, Br) molecules. The 0 K dissociation onsets for these species have been measured from the breakdown diagram and the ion time-of-flight distributions, which were modeled with the statistical RRKM theory and DFT calculations. The measured 0 K dissociative photoionization onsets were as follows: Me3Ge+ + Me (9.826 +/- 0.010 eV); Me3Ge+ + Cl (10.796 +/- 0.040 eV); Me3Ge+ + Br (10.250 +/- 0.011 eV); Me2GeCl+ + Me (10.402 +/- 0.010 eV); and Me2GeBr+ + Me (10.333 +/- 0.020 eV). These onsets were used to obtain new values for delta(f)H(degrees)298 (in kJ/mol) of the neutral molecules Me3GeCl (-239.8 +/- 5.7) and Me3GeBr (-196.5 +/- 4.3), and also for the following ionic species: Me3Ge+ (682.3 +/- 4.1), Me2GeCl+ (621.1 +/- 5.8), and Me2GeBr+ (657.8 +/- 4.7). | Simanzhenkov V, Wiggers H, Roth P (2005) Properties of flame synthesized germanium oxide nanoparticles. Journal of nanoscience and nanotechnology 5, 436-441 [PubMed:15913252] [show Abstract] Germanium oxide (GeOx) nanoparticles in the size range from 1.5 to 10 nm were synthesized in a low-pressure premixed H2/O2/Ar flame in the pressure range 25-55 mbar. The flame was doped with different amounts of tetramethylgermanium (Ge(CH3)4) ranging from 500 to 2000 ppm. The influence of process parameters such as pressure, flame coordinate, and cold gas flow velocity with respect to growth of germanium oxide particles were investigated. The formed particles were analyzed in-situ according to their mass and charge by means of a particle mass spectrometer (PMS). The specific surface area was determined ex-situ by the BET method. The crystal structure and chemical composition of the produced nanopowder was characterized by EDX and XRD measurements. Additionally, the particles were analyzed by means of FT-IR spectroscopy. | Simanzhenkov V, Ifeacho P, Wiggers H, Knipping J, Roth P (2004) Synthesis of germanium oxide nanoparticles in low-pressure premixed flames. Journal of nanoscience and nanotechnology 4, 157-161 [PubMed:15112560] [show Abstract] Germanium oxide (GeOx) nanoparticles in the size range from 1 nm to 5 nm were synthesized in a low-pressure premixed H2/O2/Ar flat flame of 30 mbar. The premixed flame was doped with different amounts of tetramethyl germanium (Ge(CH3)4) ranging from 250 ppm to 2000 ppm. The influence of process parameters such as the amount of oxygen in the reaction gas, the condensation and reaction time, standoff, and precursor concentration with respect to growth of germanium oxide particles were investigated. The particles formed were analyzed in situ according to their mass and charge with a particle mass spectrometer. The specific surface area was determined ex situ by the BET method. The crystal form and chemical composition of produced nanopowders were characterized by EDX analysis and X-ray diffraction measurements. |
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