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Masciocchi N, Castelli F, Forster PM, et al. Synthesis and characterization of two polymorphic crystalline phases and an amorphous powder of nickel(II) bisimidazolate. Inorg Chem. 2003;42(19):6147-52doi: 10.1021/ic034619o.
Masciocchi, N., Castelli, F., Forster, P. M., Tafoya, M. M., & Cheetham, A. K. (2003). Synthesis and characterization of two polymorphic crystalline phases and an amorphous powder of nickel(II) bisimidazolate. Inorganic chemistry, 42(19), 6147-52. https://doi.org/10.1021/ic034619o
Masciocchi, Norberto, et al. "Synthesis and characterization of two polymorphic crystalline phases and an amorphous powder of nickel(II) bisimidazolate." Inorganic chemistry vol. 42,19 (2003): 6147-52. doi: https://doi.org/10.1021/ic034619o
Masciocchi N, Castelli F, Forster PM, Tafoya MM, Cheetham AK. Synthesis and characterization of two polymorphic crystalline phases and an amorphous powder of nickel(II) bisimidazolate. Inorg Chem. 2003 Sep 22;42(19):6147-52. doi: 10.1021/ic034619o. PMID: 12971789.
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Inorg Chem. 2003 Sep 22;42(19):6147-52. doi: 10.1021/ic034619o.

Synthesis and characterization of two polymorphic crystalline phases and an amorphous powder of nickel(II) bisimidazolate.

Inorganic chemistry

Norberto Masciocchi, Fulvio Castelli, Paul M Forster, Maya M Tafoya, Anthony K Cheetham

Affiliations

  1. Dipartimento di Scienze Chimiche, Fisiche e Matematiche, Università dell'Insubria, via Valleggio 11, 22100 Como, Italy. [email protected]

PMID: 12971789 DOI: 10.1021/ic034619o

Abstract

Nickel(II) bisimidazolate is polymorphic. Depending on the synthetic strategy adopted, two crystalline phases (alpha- and beta-Ni(im)(2)) or an amorphous material of the same composition can be prepared. The thermodynamically stable alpha-Ni(im)(2) phase, which can be prepared in water at elevated temperatures, contains a two-dimensional polymer (of nearly square meshes) with square-planar NiN(4) chromophores and exo-bidentate imidazolate ligands bridging nickel atoms that are ca. 5.73 A apart. The beta-Ni(im)(2) phase can be kinetically stabilized at lower temperatures, but the structural complexity and the lack of single crystals prevented its full structural characterization, even in the presence of an indexed powder diffraction pattern. The spectroscopic features of these crystalline phases are compared with those of the amorphous material.

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