Phase transition and switchable dielectric behaviours in an organic–inorganic hybrid compound: (3-nitroanilinium) 2 (18-crown-6) 2 (H 2 PO 4 ) 2 (H 3 PO 4 ) 3 (H 2 O)

Layered cobalt phosphate grafted with hydrazinium ligands : Co 2 ( PO 4 ) ( H 2 PO 4 ) N 2 H 5

The title compound has been hydrothermally synthesized from elemental cobalt, phosphoric acid, and hydrazine, and characterized by single crystal X-ray diffraction [crystal data: triclinic, P1Å, a~5.1393(6), b~6.363(1), c~11.293(1) AÊ , a~95.65(1), b~96.874(9), c~92.79(1)3], IR, TGA, and magnetic measurement. The structure is made of neutral layers of corner-sharing PO4 tetrahedra and dimers of...

Two caesium vanadium hydrogenphosphates with tunnelled structures: Cs(2)V(2)O(3)(PO(4))(HPO(4)) and Cs(2)[(VO)(3)(HPO(4))(4)(H(2)O)].H(2)O.

Dicaesium divanadium trioxide phosphate hydrogenphosphate, Cs(2)V(2)O(3)(PO(4))(HPO(4)), (I), and dicaesium tris[oxidovanadate(IV)] hydrogenphosphate dihydrate, Cs(2)[(VO)(3)(HPO(4))(4)(H(2)O)].H(2)O, (II), crystallize in the monoclinic system with all atoms in general positions. The structures of the two compounds are built up from VO(6) octahedra and PO(4) tetrahedra. In (I), infinite chains ...

H.1 H.2 H.3 H.4

Cyclo­hexa­nespiro-2′-[2′,3′,6′,7′-tetra­hydro-1′H-cyclo­penta­[d]pyrimidin]-4′(5′H)-one

The title compound, C(12)H(18)N(2)O, was synthesized by the reaction of cyclo-hexa-none and 2-amino-cyclo-pent-1-enecarbonitrile. In the mol-ecule of the title compound, the six-carbon ring displays a chair conformation, the six-membered 1,3-diaza ring and the cyclo-pentene ring both assume envelope conformations. Supra-molecular aggregation is achieved by N-H⋯O hydrogen bonds.

[ Ni ( MeCN ) ( H 2 O ) 2 ( NO 3 ) 2 ] ( 15 - crown - 5 )

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