کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1406508 | 1501857 | 2009 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Engineering of copper molybdates: Piperazine dictated pseudopolymorphs Engineering of copper molybdates: Piperazine dictated pseudopolymorphs](/preview/png/1406508.png)
The hydrothermal syntheses, crystal structures and magnetic behavior of two compositionally different piperazine pillared copper molybdates, [{Cu(pip)0.5}MoO4] (1) and a hitherto unknown [Cu(pip)MoO4] (pip = piperazine) (2), are reported. Both 1 and 2 exhibit three-dimensional covalent frameworks constructed from bimetallic oxide layers pillared by piperazine; however, the {CuMoO4} networks are quite distinct. The Cu–Mo–O layers in 1 are made of edge-shared {CuO4N} square pyramidal pairs linked through {MoO4} tetrahedra, in contrast to the sheets in 2 that are built of corner-sharing {MoO4} tetrahedra and {CuO3N2} square pyramids. Self assembly of the two pseudopolymorphs, 1 and 2, is interpreted in terms of molecular recognition between reasonable soluble molecular species in the supramolecular reaction along the mechanistic approach proposed by Ramanan and Whittingham for rationalizing metal-organic framework structures. Crystal data: 1, Triclinic, space group P-1, a = 5.5765(8) Å, b = 6.8304(10) Å, c = 9.2379(14) Å, α = 100.688(2)°, β = 101.462(2)°, γ = 112.624(2)°, Z = 2; 2, Orthorhombic, space group Pbca, a = 11.3899(11) Å, b = 10.7726(10) Å, c = 13.2541(12) Å, Z = 8.
Journal: Journal of Molecular Structure - Volume 933, Issues 1–3, 17 September 2009, Pages 156–162