Toward an iron(II) spin-crossover grafted phosphazene polymer

Ross Davidson, Eric W Ainscough, Andrew M Brodie, Geoffrey Jameson, Mark Waterland, Harry R Allcock, Mark D Hindenlang, Boujemaa Moubaraki, Keith Spencer Murray, Keith C Gordon, Raphael Horvath, Guy N L Jameson

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29 Citations (Scopus)


Two new cyclotriphosphazene ligands with pendant 2,2 :6 ,2 -terpyridine (Terpy) moieties, namely, (pentaphenoxy) 4-[2,6-bis(2-pyridyl)]pyridoxy -cyclotriphosphazene (L-1), (pentaphenoxy) 4-[2,6-terpyridin-4-yl]phenoxy cyclotriphosphazene (L-2), and their respective polymeric analogues, L-1P and L-2P, were synthesized. These ligands were used to form iron(II) complexes with an Fe(II)Terpy(2) core. Variable-temperature resonance Raman, UV-visible, and Mossbauer spectroscopies with magnetic measurements aided by density functional theory calculations were used to understand the physical characteristics of the complexes. By a comparison of measurements, the polymers were shown to behave in the same way as the cyclotriphosphazene analogues. The results showed that spin crossover (SCO) can be induced to start at high temperatures by extending the spacer length of the ligand to that in L-2 and L-2P; this combination provides a route to forming a malleable SCO material.
Original languageEnglish
Pages (from-to)8307 - 8316
Number of pages10
JournalInorganic Chemistry
Issue number15
Publication statusPublished - 2012

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