Polythiazyl

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Polythiazyl
Polythiazyl-2D-dimensions.png
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Identifiers
CAS number 56422-03-8 N
Properties
Molecular formula (SN)x
Appearance bronze colour, metallic lustre[1]
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Polythiazyl (polymeric sulfur nitride), (SN)x, is an electrically conductive, gold- or bronze-colored polymer with metallic luster. It was the first conductive inorganic polymer discovered,[1] and was also found to be a superconductor at very low temperatures (below 0.26 K).[2][3]

Structure and bonding[edit]

Several resonance structures can be written:[4]

Polythiazyl resonance structures

Synthesis[edit]

Polythiazyl is synthesized by the polymerization of the dimer disulfur dinitride (S2N2), which is in turn synthesized from the cyclic alternating tetramer tetrasulfur tetranitride (S4N4). Conversion from cyclic tetramer to dimer is catalized with hot silver wool.[1][5]

S4N4 + 8 Ag → 4 Ag2S + 2 N2
S4N4 (w/ Ag2S catalyst) → 2 S2N2 (w/ 77K cold finger) → S2N2
S2N2 (@ 0°C, sublimes to surface) → thermal polymerization → (SN)x

Uses[edit]

Due to its electrical conductivity, polythiazyl is used in LEDs, transistors, battery cathodes, and solar cells.[5]

References[edit]

  1. ^ a b c Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. pp. 725–727. ISBN 0080379419. 
  2. ^ Labes, M. M.; Love, P.; Nichols, L. F. (1979). "Polysulfur Nitride - a Metallic, Superconducting Polymer". Chemical Reviews 79 (1): 1–15. doi:10.1021/cr60317a002. 
  3. ^ Harry R. Allcock (20 September 2011). Introduction to Materials Chemistry. John Wiley & Sons. p. 131. ISBN 978-1-118-21098-7. Retrieved 29 June 2012. 
  4. ^ Okada, M.; Tanaka, K.; Takata, A.; Yamabe, T. (1993). "Examination of Electronic Phase of the Hartree-Fock Solution of an Isolated Polythiazyl Chain". Synthetic Metals 59 (2): 223–230. doi:10.1016/0379-6779(93)91029-2. 
  5. ^ a b Ronald D. Archer (26 February 2001). Inorganic and Organometallic Polymers. John Wiley & Sons. p. 213. ISBN 978-0-471-24187-4. Retrieved 29 June 2012.