Syntheses and Structures of Two New Cu/Nb/pyrazine Complexes: Three dimensional CuNb(pyz)₂OF₅ · (pyz)(H₂O) and two dimensional [Cu(pyz)_2.5]⁺ [NbF₆]⁻ · (pyz)

Abstract

Abstract Crystals of CuNb(pyz) 2 OF 5 · (pyz)(H 2 O) ( 1 ) and [Cu(pyz) 2.5 ] + [NbF 6 ] − · (pyz) ( 2 ) were grown (150°C and autogeneous pressures) from CuO, 1/2(Nb 2 O 5 ), (HF) x · pyridine, and H 2 O in excess pyrazine. Light blue single crystals of ( 1 ) are orthorhombic, crystallizing in space group Cccm (No. 66), with a = 14.547(1) Å, b = 16.135(2) Å, c = 13.803(2) Å, and Z = 8. The structure of ( 1 ) contains corner shared [Cu(pyz) 4/2 F 2/2 ] + , [Cu(pyz) 4/2 O 2/2 ], and [NbF 4 O 1/2 F 1/2 ] −0.5 octahedra. Orange crystals of ( 2 ) are monoclinic, crystallizing in space group C2/c (No. 15), with a = 11.792(8) Å, b = 17.123(3) Å, c = 17.051(5) Å, β = 90.04(4)°, and Z = 8. The structure of ( 2 ) contains puckered rings of corner shared [Cu(pyz)(pyz) 3/2 ] + tetrahedra and isolated [NbF 6 ] − anions within the rings.