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The Disproportionation of [Ni(tacn)] 2+ in Ni 2+ and [Ni(tacn) 2 ] 2+ Crystallographically Demonstrated (tacn=1,4,7‐Triazacyclononane)
Author(s) -
Amendola Valeria,
Boiocchi Massimo,
Fabbrizzi Luigi,
Fusco Nadia,
Valeri Elisa
Publication year - 2014
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201403969
Subject(s) - disproportionation , chemistry , nickel , crystallography , nuclear chemistry , crystal structure , inorganic chemistry , catalysis , organic chemistry
From an EtOH/H 2 O solution, 0.3 M each of Ni 2+ and cyclic triamine tacn ( 2 ; tacn=1,4,7‐triazacyclononane), after 10 min refluxing and cooling at room temperature, copious and comparable amounts of blue crystals (containing the complex [Ni(tacn)(H 2 O) 3 ] 2+ ) and pink crystals (containing in the same cell both [Ni(H 2 O) 6 ] 2+ and [Ni(tacn) 2 ] 2+ ) precipitated. This unusual behaviour is ascribed to the fact that at the refluxing temperature the three species are present at the equilibrium in similar concentrations, which are frozen on cooling, due to the inertness of the macrocyclic complexes [Ni(tacn)(H 2 O) 3 ] 2+ and [Ni(tacn) 2 ] 2+ .