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[(C 6 H 10 )(NH 3 ) 2 ][Ni(H 2 O) 4 C 6 H 2 (COO) 4 ]·4H 2 O – A Coordination Polymer with the Chain‐like Polyanion {Ni(H 2 O) 4 [C 6 H 2 (COO) 4 ] 2− } n
Author(s) -
Köferstein Roberto,
Robl Christian
Publication year - 2007
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200700139
Subject(s) - triclinic crystal system , crystallography , octahedron , nickel , aqueous solution , chemistry , non blocking i/o , molecule , formula unit , thermogravimetric analysis , thermal decomposition , crystal structure , organic chemistry , catalysis , biochemistry
Triclinic single crystals of [(C 6 H 10 )(NH 3 ) 2 ][Ni(H 2 O) 4 C 6 H 2 (COO) 4 ]·4H 2 O have been prepared in aqueous solution at 55 °C. Space group ${\rm P}{\bar 1}$ (Nr. 2), a = 691.23(6), b = 924.84(5), c = 1082.43(7) pm, α = 74.208(6)°, β = 75.558(7)°, γ = 68.251(6)°, V = 0.60985(7) nm 3 , Z = 1. The Nickel(II) species, located on a crystallographic inversion centre, is coordinated in a trans‐ octahedral fashion by two oxygen atoms stemming from the centrosymmetric pyromellitate anions and four from water molecules (Ni–O 205.82(12) – 208.11(13) pm). The connection between Ni 2+ and [C 6 H 2 (COO) 4 )] 4− leads to infinite chain‐like polyanions extending parallel to $\rm [10{\bar 1}]$ with {Ni(H 2 O) 4 [C 6 H 2 (COO) 4 ] 2− } n composition. [(C 6 H 10 )(NH 3 ) 2 ] 2+ ‐cations are accomodated between the chains, compensating for the negative charge of the polyanions. Thermogravimetric analysis in air showed that the loss of water of crystallisation occurs in two steps between 102 and 206 °C, corresponding to the loss of 6 and 2 water molecules per formula unit, respectively. The dehydrated sample was stable between 206 and 353 °C. Further decomposition yielded nickel(II) oxide (NiO).