Postassembly Transformation of a Catalytically Active Composite Material, Pt@ZIF-8, via Solvent-Assisted Linker Exchange.

2-Methylimidazolate linkers of Pt@ZIF-8 are exchanged with imidazolate using solvent-assisted linker exchange (SALE) to expand the apertures of the parent material and create Pt@SALEM-2. Characterization of the material before and after SALE was performed. Both materials are active as catalysts for the hydrogenation of 1-octene, whereas the hydrogenation of cis-cyclohexene occurred only with Pt@SALEM-2, consistent with larger apertures for the daughter material.

Ligand-Unsymmetrical Phenoxyiminato Dinickel Catalyst for High Molecular Weight Long-Chain Branched Polyethylenes.

An unsymmetrical bimetallic catalyst, (/), having a CF-functionalized phenoxyiminato Ni(II) center, which produces linear high- polyolefin () joined to an adjacent SO-functionalized phenoxyiminato Ni(II) center, which produces highly branched low- polyolefin (), was synthesized and fully characterized. In ethylene homopolymerizations, (/) affords monomodal ( = 1.7), highly, long-chain branched (69 branches/1000 C) polyethylenes with = 24 kg/mol.

Exploiting parameter space in MOFs: a 20-fold enhancement of phosphate-ester hydrolysis with UiO-66-NH.

The hydrolysis of nerve agents is of primary concern due to the severe toxicity of these agents. Using a MOF-based catalyst (UiO-66), we have previously demonstrated that the hydrolysis can occur with relatively fast half-lives of 50 minutes. However, these rates are still prohibitively slow to be efficiently utilized for some practical applications (, decontamination wipes used to clean exposed clothing/skin/vehicles).

Isostructural single-chain and single-molecule magnets.

Isostructural single-chain magnet (SCM) and single-molecule magnets (SMM) with formulas [Mn(6)X(2)(salox)(6)O(2)(N(3))(8)] (X = Mn(II) (1), Cd(II) (2); H(2)salox = salicylaldoxime) have been synthesized and magnetically characterized. Complexes 1 and 2 possess significantly different magnetization reversal barriers of U(eff) = 100.3 and 57.

Large spin-state changes in isostructural cyanate- and azide-bridged Mn(3)(III)Mn(2)(II) single-molecule magnets.

We prepared three structurally related Mn(3)(III)Mn(2)(II) complexes that possess S approximately 1-11 spin ground states as a result of variations in the geometry and identity of mu(2)-eta(1):eta(1) bridging groups. These complexes function as single-molecule magnets yet demonstrate other interesting behavior such as quasi-classical magnetization hysteresis and comparable magnetization reversal barriers (U(eff)).

Photoluminescent Mn4 single-molecule magnet.

The synthesis of [Mn(4)(anca)(4)(Hmdea)(2)(mdea)(2)].2CHCl(3) (1) is reported along with room temperature fluorescence, UV-vis, and NMR spectra. Direct current magnetization versus field data reveal a S = 8 ground state.