Anisotropy of the proton spin--lattice relaxation time in the superconducting intercalation complex TaS$sub 2$(NH$sub 3$): Structural and bonding implications

Journal Article · Mon Sep 15 00:00:00 EDT 1975 · J. Chem. Phys., v. 63, no. 6, pp. 2544-2552

OSTI ID:4179623

Gamble, F R; Silbernagel, B G

The nature of the interaction responsible for the formation of molecular intercalation complexes between Lewis bases and layered transition metal dichalcogenides is not well understood. To some extent this is due to a lack of structural information. A prototype of these complexes is TaS$sub 2$(NH$sub 3$), in which monolayers of ammonia are inserted between the metallic, superconducting layers of TaS$sub 2$. The compound is crystalline and stoichiometric. Measurement of the anisotropy of the proton spin--lattice relaxation time at 300 degreeK indicates that the molecular threefold symmetry axis is not perpendicular to the disulfide layers as suggested by other workers, but is parallel to the layers. This orientation precludes direct interaction between the molecular lone pair orbital and the transition metal atoms. The interactions governing the structure of this complex may be similar to those obtaining in the intercalation complexes between TaS$sub 2$ and a number of substituted pyridines, in which complexes the axis of the lone pair orbital is also parallel to the layers.

• Research Organization: Corporate Research Laboratories, Exxon Research and Engineering Company, Linden, New Jersey 07036
• NSA Number: NSA-33-003667
• OSTI ID: 4179623
• Journal Information: J. Chem. Phys., v. 63, no. 6, pp. 2544-2552, Other Information: Orig. Receipt Date: 30-JUN-76
• Country of Publication: United States
• Language: English

Related Subjects

N50330* -Metals
Ceramics
& Other Materials-Plastics & Other Materials-Properties
Structure & Phase Studies
360603* -Materials-Other Materials-Properties
*TANTALUM SULFIDES- CRYSTAL STRUCTURE
AMMONIA
CHEMICAL BONDS
CLATHRATES
NUCLEAR MAGNETIC RESONANCE
SPIN-LATTICE RELAXATION
SUPERCONDUCTIVITY