Cadmium and mercury acetates have been reacted with pyrazole (Hpz) and 3,5-dimethylpyrazole (Hdmpz), affording distinct mixed-ligand species, selectively prepared upon slightly modifying the reaction conditions. Two polymorphs of [{Cd(μ-ac)2(Hpz)2}n], as well as the [{Cd(μ-ac)2(Hdmpz)2}n] species (Hac = acetic acid), were obtained by solution chemistry, while the two-dimensional [{Cd3(μ3-ac)4(μ-pz)2(Hpz) 2}n] and [{Cd(μ-ac)(μ-pz)}n] polymers were prepared upon controlled thermal treatment of one of the [{Cd(μ-ac) 2(Hpz)2}n] forms. Two mercury derivatives, [{Hg3(μ-ac)3(μ-pz)3}n] and [{Hg(ac)(μ-dmpz)}n], were also prepared, the latter containing one-dimensional chains of Hg(II) ions bridged by C-mercuriated Hdmpz ligands. All their crystal structures (but one) were determined by powder diffraction methods using conventional X-ray laboratory equipment, supported by 13C CPMAS NMR measurements. The latter method helped in assigning a C-metalated nature to an amorphous material of [Hg(ac)(pz)] formula, obtained by employing EtOH as a solvent. A few other Hdmpz-containing cadmium acetates were also prepared, but their polyphasic nature, evidenced by diffraction methods, hampered their complete structural characterization.

Synthesis, solid-state NMR, and X-ray powder diffraction characterization of group 12 coordination polymers, including the first example of a C-mercuriated pyrazole

MASCIOCCHI, NORBERTO;GALLI, SIMONA;
2006-01-01

Abstract

Cadmium and mercury acetates have been reacted with pyrazole (Hpz) and 3,5-dimethylpyrazole (Hdmpz), affording distinct mixed-ligand species, selectively prepared upon slightly modifying the reaction conditions. Two polymorphs of [{Cd(μ-ac)2(Hpz)2}n], as well as the [{Cd(μ-ac)2(Hdmpz)2}n] species (Hac = acetic acid), were obtained by solution chemistry, while the two-dimensional [{Cd3(μ3-ac)4(μ-pz)2(Hpz) 2}n] and [{Cd(μ-ac)(μ-pz)}n] polymers were prepared upon controlled thermal treatment of one of the [{Cd(μ-ac) 2(Hpz)2}n] forms. Two mercury derivatives, [{Hg3(μ-ac)3(μ-pz)3}n] and [{Hg(ac)(μ-dmpz)}n], were also prepared, the latter containing one-dimensional chains of Hg(II) ions bridged by C-mercuriated Hdmpz ligands. All their crystal structures (but one) were determined by powder diffraction methods using conventional X-ray laboratory equipment, supported by 13C CPMAS NMR measurements. The latter method helped in assigning a C-metalated nature to an amorphous material of [Hg(ac)(pz)] formula, obtained by employing EtOH as a solvent. A few other Hdmpz-containing cadmium acetates were also prepared, but their polyphasic nature, evidenced by diffraction methods, hampered their complete structural characterization.
2006
Masciocchi, Norberto; Galli, Simona; Alberti, Elena; Sironi, Angelo; Di Nicola, Corrado; Pettinari, Claudio; Pandolfo, Luciano
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/1495156
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