Synthesis of Poly(ethylene oxide)s with 1,2,4-Triazol-4-yl End Groups – Macroligands for Bistable Metal-Polymer Complexes
✍ Scribed by Robert Saf; Gerald Schwarzenbacher; Christian Mirtl; Gertraud Hayn; Josefine Hobisch; Karl Gatterer
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 121 KB
- Volume
- 25
- Category
- Article
- ISSN
- 1022-1336
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✦ Synopsis
Abstract
Summary: Poly(ethylene oxide) methyl ether 4__H__‐1,2,4‐triazol‐4‐yl (1) has been synthesized as a novel macroligand. ESI‐MS (electrospray ionisation mass spectrometry), MALDI‐TOF (matrix‐assisted laser desorption ionisation time‐of‐flight) MS as well as NMR spectroscopy were used for the accurate determination of number‐average molecular weights ($\overline M _{\rm n}$), the crucial parameter for subsequent synthesis of metal‐polymer complexes of four different samples 1a–d. Reaction of polymer 1a with Fe(H~2~O)~6~~2~ (nps = 3‐nitrophenylsulfonate) gave Fe(1a)~3~~2~, a bistable metal‐polymer complex that exhibited low‐spin (LS) to high‐spin (HS) transitions around T~1/2~ = 257 K, accompanied by a change in colour from violet (LS) to slightly yellow (HS).
The structure of Fe(1a)~3~~2~ and its magnetic properties.
imageThe structure of Fe(1a)~3~~2~ and its magnetic properties.