Thallium hydride
Encyclopedia
Thallium Hydride is a compound composed of Thallium
and Hydrogen
atoms (TlH3 or TlH). Thallium is the heaviest member of the Group 13 metals
, the stability of group 13 metal hydrides decreases with increasing periodic number. This is commonly attributed to poor overlap of the valence metal orbitals with that of the 1s orbital of Hydrogen. Despite encouraging early reports, it is unlikely that a thallium hydride species has been isolated. Thallium hydrides have been observed only in matrix isolation studies, the infrared spectrum was obtained in the gas phase by laser ablation of Thallium in presence of Hydrogen gas. This study confirmed aspects of ab initio calculations conducted by Schwerdtfeger which indicated the similar stability of thallium and indium hydrides. There has not been a confirmed isolation of a thallium hydride complex to date.
Thallium
Thallium is a chemical element with the symbol Tl and atomic number 81. This soft gray poor metal resembles tin but discolors when exposed to air. The two chemists William Crookes and Claude-Auguste Lamy discovered thallium independently in 1861 by the newly developed method of flame spectroscopy...
and Hydrogen
Hydrogen
Hydrogen is the chemical element with atomic number 1. It is represented by the symbol H. With an average atomic weight of , hydrogen is the lightest and most abundant chemical element, constituting roughly 75% of the Universe's chemical elemental mass. Stars in the main sequence are mainly...
atoms (TlH3 or TlH). Thallium is the heaviest member of the Group 13 metals
Boron group
The boron group is the series of elements in group 13 of the periodic table, comprising boron , aluminium , gallium , indium , thallium , and ununtrium . The elements in the boron group are characterized by having three electrons in their outer energy levels...
, the stability of group 13 metal hydrides decreases with increasing periodic number. This is commonly attributed to poor overlap of the valence metal orbitals with that of the 1s orbital of Hydrogen. Despite encouraging early reports, it is unlikely that a thallium hydride species has been isolated. Thallium hydrides have been observed only in matrix isolation studies, the infrared spectrum was obtained in the gas phase by laser ablation of Thallium in presence of Hydrogen gas. This study confirmed aspects of ab initio calculations conducted by Schwerdtfeger which indicated the similar stability of thallium and indium hydrides. There has not been a confirmed isolation of a thallium hydride complex to date.