Temperature-Dependent FT-IR Spectroscopy Study of Silver 1,9-Nonanedithiolate

Authors: Choi, Hyouk Jin; Han, Sang Woo; Lee, Seung Joon; Kim, Kwan

Source: Applied Spectroscopy, Volume 55, Issue 8, Pages 260A-294A and 955-1111 (August 2001) , pp. 1085-1091(7)

Publisher: Society for Applied Spectroscopy

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Abstract:

The structure and thermal behavior of silver 1,9-nonanedithiolate (AgNDT) is investigated by means of diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, X-ray diffraction (XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and elemental analysis. The XRD data suggests that AgNDT has a layered structure but with poor registry between layers. The poor registry seems to be associated with the deficiency of Ag by 20% in binding to the available sulfur atoms. DRIFT spectral data nonetheless indicates that the carbon chains take nearly all-trans conformation. The temperature-dependent DRIFT spectral data suggests that AgNDT should degrade at >530 K without any thermodynamic phase transition, in agreement with the TGA and DSC analysis. The finding that AgNDT does not exhibit liquid-crystalline behavior upon melting is attributed to the formation of two Ag-S bonds (as α,ω-dithiolate) in AgNDT, even though each Ag atom is trigonally bonded to sulfur, as in silver monothiolate (AgSR).

Keywords: DRIFT; INFRARED SPECTROSCOPY; SILVER 1,9-NONANEDITHIOLATE; SILVER DITHIOLATE; THERMAL BEHAVIOR

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702011952992

Publication date: August 1, 2001

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