Abstract
The solid-state structures of two metal-pyridine-sulfate compounds, namely catena-poly[[tetra-kis-(pyridine-κN)iron(II)]-μ-sulfato-κ2O:O'], [Fe(SO4)(C5H5N)4] n , (1), and catena-poly[[tetra-kis-(pyridine-κN)cobalt(II)]-μ-sulfato-κ2O:O'-[tetra-kis-(pyridine-κN)cobalt(II)]-μ-sulfato-κ3O,O':O''-[tris-(pyridine-κN)cobalt(II)]-μ-sulfato-κ2O:O'], [Co3(SO4)3(C5H5N)11] n , (2), are reported. The iron compound (1) displays a polymeric structure, with infinite chains of FeII atoms adopting octa-hedral N4O2 coordination environments that involve four pyridine ligands and two bridging sulfate ligands. The cobalt compound (2) displays a polymeric structure, with infinite chains of CoII atoms. Two of the three Co centers have an octa-hedral N4O2 coordination environment that involves four pyridine ligands and two bridging sulfate ligands. The third Co center has an octa-hedral N3O3 coordination environment that involves three pyridine ligands, and two bridging sulfate ligands with one sulfate chelating the cobalt atom.
Highlights
The solid-state structures of two metal–pyridine–sulfate compounds, namely catena-poly[[tetrakis(pyridine-N)iron(II)]--sulfato-2O:O0], [Fe(SO4)(C5H5N)4]n, (1), and catena-poly[[tetrakis(pyridine-N)cobalt(II)]--sulfato2O:O0-[tetrakis(pyridine-N)cobalt(II)]--sulfato-3O,O0:O00-[tris(pyridineN)cobalt(II)]--sulfato-2O:O0], [Co3(SO4)3(C5H5N)11]n, (2), are reported
The first reports of a pyridine–sulfato–metal complex were in the late 19th century (Reitzenstein, 1894; Reitzenstein, 1898), and this work played a significant role in the Werner– Jørgensen controversy (Howe, 1898)
While most early work in coordination chemistry was based upon ammonia complexes, the demonstration of the existence of similar complexes with other organic bases such as pyridine was an important contribution to the field
Summary
Symmetry codes: (i) Àx; Ày; Àz; (ii) Àx À 12; y; Àz. 169 171 dinated to an iron atom sitting on an inversion center (Fig. 1a). In the pink crystals of (2), the asymmetric unit consists of three cobalt atoms, eleven coordinated pyridine molecules, and three sulfate anions (Fig. 2a). The four pyridine rings are rotated from the CoN4 plane by dihedral angles of 55.37 (1), 65.88 (1), 858 Pham et al [Fe(SO4)(C5H5N)4] and [Co3(SO4)3(C5H5N)11]. Two of the rings are involved in two C—HÁ Á ÁO interactions each with the sulfate oxygen atoms (Table 2). Unlike the other two metal centers, Co3 has an N3O3 coordination environment, possessing a meridional arrangement It is part of a tripyridine cobalt unit, with a CoN3 plane showing a maximum deviation from planarity of 0.021 A. The three pyridine rings are rotated from the CoN3 plane by dihedral angles of 31.855 (2), 44.111 (3) and 82.863 (4). HÁ Á ÁO interactions with sulfate oxygen atoms (Table 2)
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