Abstract
The title hydrated salt, C30H26N62+·2C9H5N4O-·3H2O, was obtained as an unexpected product from the hydro-thermal reaction between potassium 1,1,3,3-tetra-cyano-2-eth-oxy-propenide, 4,4'-bi-pyridine and iron(II) sulfate hepta-hydrate. The cation lies across a twofold rotation axis in the space group I2/a with the other components all in general positions. In the cation, the H atom linking the pyridine units is disordered over two adjacent sites having occupancies of 0.66 (4) and 0.36 (4), i.e. as N-H⋯N and N⋯H-N. The water mol-ecules of crystallization are each disordered over two sets of atomic sites, having occupancies of 0.522 (6) and 0.478 (6) for one, and 0.34 (3) and 0.16 (3) for the other, and it was not possible to reliably locate the H atoms associated with these partial-occupancy sites. In the crystal, four independent C-H⋯N hydrogen bonds link the ionic components into a three-dimensional network.
Highlights
0.16 (3) for the other, and it was not possible to reliably locate the H atoms associated with these partial-occupancy sites
The use of polynitrile anions as coordinating ligands for the construction of polymeric architectures with interesting properties has been a burgeoning subject in materials and coordination chemistry (Thétiot et al, 2003; Benmansour et al, 2007; Atmani et al, 2008). These anions are versatile structural components, leading to many different architectures in zero, one, two or three dimensions, and incorporating most of the 3d transition metals (Benmansour et al, 2008, 2010, 2012; Yuste et al, 2009; Setifi, Domasevitch et al, 2013; Setifi, Setifi et al, 2013; Setifi, Lehchili et al, 2014). This versatility is based on two main properties of these ligands: (i) the ability to act as bridges, given the linear and rigid geometry of the cyano groups, and (ii) the possibility of functionalization with different potentially coordinating groups that leads to a high variety of coordination modes
The C—C distances in the C(CN)2 fragments are all short for their type [mean value (Allen et al, 1987) 1.431 Å, lower quartile value 1.425 Å], while the C—N
Summary
The use of polynitrile anions as coordinating ligands for the construction of polymeric architectures with interesting properties has been a burgeoning subject in materials and coordination chemistry (Thétiot et al, 2003; Benmansour et al, 2007; Atmani et al, 2008) These anions are versatile structural components, leading to many different architectures in zero, one, two or three dimensions, and incorporating most of the 3d transition metals (Benmansour et al, 2008, 2010, 2012; Yuste et al, 2009; Setifi, Domasevitch et al, 2013; Setifi, Setifi et al, 2013; Setifi, Lehchili et al, 2014). During the course of attempts to prepare such complexes with 4,40 -bipyridine, we isolated the title compound (I) (Fig. 1 and Scheme 1), whose structure is reported here
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