Crystal and molecular structure of [H3O·18-crown-6]2-[ReCl6] isolated from a liquid clathrate medium

The crystal and molecular structure of [H3O·18-crown-6]2[ReCl6] 1 is reported. Crystal data for 1: trigonal, space group R 3, a = 13.857(2) Å, c = 10.154(2) Å, Dc = 2.85 g/cm3, Z = 3, Rf = 0.073, Rw = 0.064. The oxonium ion is observed to be crystallographically disordered lying 0.37 Å on both sides of the plane defined by the crown ether oxygen atoms. The anion resides on a crystallographic 3 position forming a slightly distorted octahedron.</p

Structural consequences of M-Cl⋯H-N hydrogen bonds in substituted pyridinium salts of the cobalt(II)tetrachloride anion isolated from liquid clathrate media

The crystal and molecular structures of two substituted pyridinium salts of the cobalt(II)tetrachloride anion, [4-picolinium]2[CoCl4] 1 and [4,4′-Bipyridinium][CoCl4] 2, isolated from liquid clathrate media are reported in order to gain an understanding into the preferred orientation adopted by such interacting moieties. We demonstrate that M-Cl⋯H-N hydrogen bonds principally govern the solid-state self-assembly of these systems. Furthermore, we reveal that 1 possesses the first noted example of a dimeric three-center hydrogen bond.</p

Isostructural coordination polymers: Epitaxis vs. solid solution

Different synthetic conditions often afford different products and this is more evident for complex structures (i.e. solvates, polymorphs, co-crystals, solid solutions, etc.). We show how solution growth of a given set of components produces an epitaxial heterocrystal while mechanochemical synthesis yields a solid solution. © 2011 The Royal Society of Chemistry.</p

Jerry Lee Atwood

[No abstract available]</p