Yaroslav Z. Khimyak

Synthesis and characterization of a new layered compound of trimesic acid

The hydrothermal reaction between 1,3,5-benzenetricarboxylic acid (trimesic acid, H3BTC) and 1,2-bis(4-pyridyl)ethane (BPE), in the presence of cadmium(II) ions, results in the formation of a novel layered salt, in which the organic cations and water molecules occupy spaces between anionic layers of trimesic acid.

Synthesis of new mesostructured aluminophosphates

Two mesolamellar aluminophosphates, designated L1 and L2, were synthesised by supramolecular templating from solutions containing a cationic surfactant. Optimal synthesis conditions have been established. XRD diffraction, solid-state NMR, FTIR, thermogravimetry and SEM reveal structural differences between the two materials. The synthesis of L2 requires higher temperatures than for L1 and involves an induction period.

Synthesis and Characterization of a Novel Modular Cadmium-Organic Framework with Biphenyl-4,4′-dicarboxylate

We report the synthesis and structural characterization of a thermally stable and highly crystalline novel metal-organic framework with cadmium(II) ions. The crystal structure is formed by a threefold interpenetration of identical three-dimensional modular frameworks, assembled by the repetition of a binuclear secondary building unit. This unit contains 1,2-bis(4-pyridyl)ethane and introduces biphenyl-4,4′-dicarboxylate as an effective rigid large spacer between metal centres. Water molecules are hydrogen bonded to carboxylate groups and act as bridges between each independent framework. To the best of our knowledge, CUmof-1 is the first structure in which the paddlewheel motif is associated with a distribution of cavities in a concertina manner. (© Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)

Synthesis and characterisation of mesoporous aluminophosphates containing boron

Mesostructured and mesoporous boroaluminophosphates (BAPOs) were synthesised using cationic templating in the presence of boric acid. The products were characterised by X-ray diffraction, 27Al, 31P and 11B solid-state NMR, thermal and elemental analysis, and nitrogen adsorption. Boron is incorporated into the structure, leading to a decrease in the degree of condensation of the inorganic component and to reduced thermal stability. Both tetrahedral and trigonal B is present in the structure of as-synthesised and calcined BAPO, but the B(4)–B(3) ratio is significantly reduced upon calcination. The kinetics of product formation were studied, and the likely mechanism of the synthesis is suggested, involving the formation of boroaluminophosphate oligomers which then react with the surfactant cations.

Solid-State NMR Studies of Mesostructured Alumino-Phosphates: Structure and Dynamics of the Inorganic Network and of the Organic Component

An array of solid-state NMR techniques has been used to characterise alumino- phosphates with hexagonal and lamellar mesostructures. Differences between the mesocomposites regarding the inorganic component, state of the template and arrangement of the inorganic/organic interface have been identified. We describe the complex picture of the structure of the hybrid solids.