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(mu-ac)(2)(Hpz)(2)}(n)], as well as the [{Cd(mu-ac)(2)(Hdmpz)(2)}(n)] species (Hac = acetic acid), were obtained by solution chemistry, while the two-dimensional [{Cd-3(mu(3)-ac)(4)(mu-pz)(2)(Hpz)(2)}(n)] and [{Cd(mu-ac)(mu-pz)}(n)] polymers were prepared upon controlled thermal treatment of one of the [{Cd(mu-ac)(2)(Hpz)(2)}(n)] forms. Two mercury derivatives, [{Hg-3(mu-ac)(3)(mu-pz)(3)}(n)] and [{Hg(ac)(mu-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 C-13 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

DI NICOLA, CORRADO;PETTINARI, Claudio;
2006

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(mu-ac)(2)(Hpz)(2)}(n)], as well as the [{Cd(mu-ac)(2)(Hdmpz)(2)}(n)] species (Hac = acetic acid), were obtained by solution chemistry, while the two-dimensional [{Cd-3(mu(3)-ac)(4)(mu-pz)(2)(Hpz)(2)}(n)] and [{Cd(mu-ac)(mu-pz)}(n)] polymers were prepared upon controlled thermal treatment of one of the [{Cd(mu-ac)(2)(Hpz)(2)}(n)] forms. Two mercury derivatives, [{Hg-3(mu-ac)(3)(mu-pz)(3)}(n)] and [{Hg(ac)(mu-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 C-13 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.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11581/113468
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 30
  • ???jsp.display-item.citation.isi??? 30
social impact