The nanoporous coordination polymer [Cu(pyrimidin-2-olate-N1,N3)(2)](n) (1(C)) of the sodalite zeotype sorbs a variety of metal nitrates [M(NO3)(m), M = Na+, K+, Rb+, Tl+, Ca2+, Sr2+, Ba2+, Pb2+, La3+, Nd3+, Gd3+, Er3+] from H2O/MeOH solutions, with a concomitant structural change to a layered [Cu(pyrimidin-2-olate-N1,N3)(2)](n)center dot[M(NO3)(m)](n/2) (MNO3@1(L)) coordination framework. Single-crystal X-ray diffraction analyses revealed that the layers are based on Cu-4(pyrimidin-2-olate-N1,N3)(4) square grids of copper(II) ions bridged by N1,N3 exobidentate ligands, displaying a structural motif of the metallacalix[4]arene type in pinched cone conformation. The interlayer space is occupied by the guest metal nitrates, each metal being coordinated by (at least) the four oxygen atoms of a metallacalix[4]arene. Magnetic measurements on the MNO3@1(L) series denoted a weak ferromagnetic ordering taking place below the Neel temperatures (typically close to 35 K), arising from spin-canting phenomena of the antiferromagnetically coupled copper centers. When M = Nd3+, Gd3+, or Er3+, additional magnetic ordering is observed at lower temperatures, which, on the basis of static and dynamic magnetic susceptibility measurements, can be attributed to copper- lanthanide interactions.

Structural and magnetic properties of layered copper(II) coordination polymers intercalating s and f metal ions

MASCIOCCHI, NORBERTO;GALLI, SIMONA;
2007-01-01

Abstract

The nanoporous coordination polymer [Cu(pyrimidin-2-olate-N1,N3)(2)](n) (1(C)) of the sodalite zeotype sorbs a variety of metal nitrates [M(NO3)(m), M = Na+, K+, Rb+, Tl+, Ca2+, Sr2+, Ba2+, Pb2+, La3+, Nd3+, Gd3+, Er3+] from H2O/MeOH solutions, with a concomitant structural change to a layered [Cu(pyrimidin-2-olate-N1,N3)(2)](n)center dot[M(NO3)(m)](n/2) (MNO3@1(L)) coordination framework. Single-crystal X-ray diffraction analyses revealed that the layers are based on Cu-4(pyrimidin-2-olate-N1,N3)(4) square grids of copper(II) ions bridged by N1,N3 exobidentate ligands, displaying a structural motif of the metallacalix[4]arene type in pinched cone conformation. The interlayer space is occupied by the guest metal nitrates, each metal being coordinated by (at least) the four oxygen atoms of a metallacalix[4]arene. Magnetic measurements on the MNO3@1(L) series denoted a weak ferromagnetic ordering taking place below the Neel temperatures (typically close to 35 K), arising from spin-canting phenomena of the antiferromagnetically coupled copper centers. When M = Nd3+, Gd3+, or Er3+, additional magnetic ordering is observed at lower temperatures, which, on the basis of static and dynamic magnetic susceptibility measurements, can be attributed to copper- lanthanide interactions.
2007
Navarro, Jorge A. R.; Barea, Elisa; Salas, Juan M.; Masciocchi, Norberto; Galli, Simona; Sironi, Angelo
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/1668081
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