Symmetry Breaking and Cooperative Spin Crossover in a Hofmann-Type Coordination Polymer Based on Negatively Charged {Fe(μ-[M(CN)])} Layers (M = Pd, Pt).

We report herein the synthesis and characterization of two unprecedented isomorphous spin-crossover two-dimensional coordination polymers of the Hofmann-type formulated {Fe(Hdpyan)(μ-[M(CN)])}, with M = Pd, Pt and Hdpyan is the partially protonated form of 2,5-(dipyridin-4-yl)aniline (dpyan). The Fe is axially coordinated by the pyridine ring attached to the 2-position of the aniline ring, while it is equatorially surrounded by four [M(CN)] planar groups acting as μ-bidentate ligands defining layers, which stack parallel to each other. The other pyridine group of Hdpyan, being protonated, remains peripheral but involved in a strong [M-C≡N···Hpy] hydrogen bond between alternate layers.

Halobenzene Clathrates of the Porous Metal-Organic Spin-Crossover Framework [Fe(tvp)(NCS)]. Stabilization of a Four-Step Transition.

Here we show that the porous metal-organic spin crossover (SCO) framework [Fe(tvp)(NCS)]@4(CHCN·HO) [] is an excellent precursor material for the systematic synthesis, via single-crystal to single-crystal transformation, of a series of halobenzene clathrates. Immersion of samples constituted of single crystals of in the liquid halobenzenes PhX, X = F ( = 1-6), X = Cl ( = 1, 2), and X = Br ( = 1) at room temperature induces complete replacement of the guest molecules by PhX to afford . Single-crystal analyses of the new clathrates confirm the integrity of the porous framework with the PhX guests being organized by pairs via π-stacking filling the nanochannels.

Development of immunosorbents for the analysis of forchlorfenuron in fruit juices by ion mobility spectrometry.

The advantages of using smart materials as immunosorbents in the analysis of complex matrices by ion mobility spectrometry (IMS) have been highlighted in this study. A novel analytical method has been proposed for the sensitive, selective, and fast determination of residues of the plant growth regulator forchlorfenuron in fruit juices. Three different monoclonal antibodies (s3#22, p2#21, and p6#41) were employed for the production of immunosorbents, based on Sepharose gel beads, which were characterized in terms of loading capacity, solvent resistance, and repeatability for its use in solid-phase extraction (SPE).