An iron(II) spin crossover grafted cyclotriphosphazene

作者：Davidson Ross J; Ainscough Eric W^*; Brodie Andrew M; Jameson Geoffrey B; Waterland Mark R; Moubaraki Boujemaa; Murray Keith S; Gordon Keith C; Horvath Raphael; Jameson Guy N L

来源：Polyhedron, 2013, 55: 37-44.

DOI：10.1016/j.poly.2013.02.065

• Cyclotriphosphazene
• Iron(II)
• Spin crossover

The synthesis of the new cyclotriphosphazene (CTP) ligand substituted with a pendant 2,6-bis(benzimidazole-2-yl)pyridine (bbp), namely (pentaphenoxy)[4-{2,6-bis(benzimidazole-2-yl}pyridine-4-yl)phenoxy]cyclotriphosphazene L is reported. The single crystal structure of L shows that the bbp group is attached to the CTP via the oxygen. L reacts with FeX2 (X = ClO4- or BF4-) salts forming the [FeL2]X-2 complexes 1 and 2 respectively. For [FeL2](BF4)(2) (2), the single crystal structure shows an %26apos;N-6%26apos; coordination sphere around the iron atom. UV-Vis, resonance Raman and Mossbauer spectroscopies and magnetic susceptibility measurements, aided by density functional theory (DFT) calculations, determine the complexes are low spin below 300 K but display spin crossover (SCO) behavior above this temperature, hence showing that the addition of a phosphazene to a SCO moiety does not prevent SCO.

• 出版日期2013-5-17