Publications by authors named "Daniel S Mast"
Article Synopsis
- Scientists studied how the solid form of TcO behaves when heated by using special X-ray techniques and computer simulations.
- They found that TcO expands a little when it gets warmer, and they measured this expansion at a specific temperature (280 K).
- The melting point of TcO is really high, but it doesn’t turn into gas easily, which is different from similar materials.
The molecular and electronic structures of the group 7 heptoxides were investigated by computational methods as both isolated molecules and in the solid-state. The metal-oxygen-metal bending angle of the single molecule increased with increasing atomic number, with ReO preferring a linear structure. Natural bond orbital and localized orbital bonding analyses indicate that there is a three-center covalent bond between the metal atoms and the bridging oxygen, and the increasing ionic character of the bonds favors larger bond angles.
View Article and Find Full Text PDFDitechnetium heptoxide was synthesized from the oxidation of TcO with O at 450 °C and characterized by single-crystal X-ray diffraction, electron-impact mass spectrometry (EI-MS), and theoretical methods. Refinement of the structure at 100 K indicates that TcO crystallizes as a molecular solid in the orthorhombic space group Pbca [a = 7.312(3) Å, b = 5.
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