Keywords: Iron / N ligands / Spin crossover / 1D chains / Dinuclear / Magnetic properties Four isostructural one-dimensional polymeric iron(II) spin crossover materials containing the ligand 2-chloro-4,6-bis(dipyrid-2-ylamino)-1,3,5-triazine (cddt) have been synthesised and magnetically and structurally characterised. The polymeric material Fe(NCS) 2 (cddt)·n(guest) (1), self assembles into three crystallographically distinct phases; the compounds 1b and 1c, [Fe(NCS) 2 (cddt)]·2(CH 3 OH), are polymorphs, however, 1a, [Fe(NCS) 2 (cddt)]·1/2(CHCl 3 )·(H 2 O) contains a different solvent system. Each phase shows very different magnetic behaviour; phases 1a and 1b remain high spin over all temperatures, whilst phase 1c undergoes a "half" spin crossover between 225 and 125 K. The structural consequences of the spin transition in 1c have been followed using variable temperature synchrotron powder X-ray diffraction techniques. Variation of the chalcogenide ligand in the complex [Fe(NCSe) 2 (cddt)]·2(CH 3 OH), 2, leads to a full one-step spin crossover with a T 1/2 of 200 K. Structural analy-
The total syntheses of (±)-aspercyclide A (1) and its C19 methyl ether derivative (15a) are described. ELISA studies show that both compounds display comparable antagonist activity against the IgE–FcεRI protein–protein interaction.
A library of solid-supported pentapeptide diboronic acids, a ‘lysine series’ and an ‘arginine series’, has been efficiently prepared using N-Fmoc-4-pinacolatoborono-l-phenylalanine and standard solid phase peptide synthesis methods. A technique for measuring the affinity of the chromophoric diol, alizarin, to the solid-supported peptide boronic acids has been developed. Considerable variation in alizarin binding strengths, both within and between arginine and lysine series was observed, with association constants in the range 200–1100 M–1 being recorded. The selective binding characteristics of these boronic acid–peptide hybrids suggest their potential use in carbohydrate sensors and cell-specific diagnostics and therapeutics.
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