13587-16-1Relevant articles and documents
Synthesis of Li2PtH6 using high pressure: Completion of the homologous series A2PtH6 (A=alkali metal)
Puhakainen, Kati,Stoyanov, Emil,Evans, Michael J.,Leinenweber, Kurt,Hussermann, Ulrich
, p. 1785 - 1789 (2010)
Li2PtH6, the missing member of the complex transition metal hydride series A2PtH6 (A=alkali metal), was prepared by reacting mixtures of LiH and Pt in the presence of BH 3NH3 as hydrogen source at pressures above 8 GPa. According to powder X-ray diffraction analysis, Li2PtH6 is isostructural to its heavier homologues and crystallizes in the cubic K 2PtCl6 structure (space group Fm3m, a=6.7681(3), Z=4). However, PtH62- octahedral complexes in Li 2PtH6 approach each other closely and its structure may likewise be regarded as a defective perovskite structure where half of the octahedrally coordinated atoms (cations) are missing. The IR spectrum of Li 2PtH6 reveals the PtH T1u stretch and bend at 1840 and 889 cm-1, respectively.
Infrared diode laser spectroscopy of lithium hydride
Yamada, Chikashi,Hirota, Eizi
, p. 6702 - 6706 (1988)
The fundamental and hot bands of the vibration-rotation transitions of 6LiH 7LiH 6LiD and 7LiD were observed by infrared diode laser spectroscopy at Doppler-limited resolution.Lithium hydride molecules were produced by the reaction of the Li vapor with hydrogen at elevated temperatures.Some 40 transitions were observed and, after combined with submillimeter-wave spectra reported by G.M.Plummer et al. , were analyzed to yield Dunham-type constants with accuracies more than an order of magnitude higher than those published in the literature.It was clearly demonstrated that the Born-Oppenheimer approximation did not hold, and some parameters representing the breakdown were evaluated.The Born-Oppenheimer internuclear distance rBOe was derived to be 1.594 914 26 (59) Angstroem, where a new value of Planck's constant recommended by CODATA was employed.The relative intensity of absorption lines was measured to determine the ratio of the permanent dipole moment to its first derivative with respect to the internuclear distance: μe/ere=1.743(86).The pressure broadening parameter Δνp/P was determined to P be 6.40 (22) MHz/Torr by measuring the linewidth dependence on the pressure of hydrogen, which was about four times larger than the value for the dipole-quadrupole interaction estimated by Kiefer and Bushkovitch's theory.
