Werner clathrate formation with polyaromatic hydrocarbons: comparison of different crystallisation methods

Abstract

Werner clathrates of bis-isothiocyanato tetrakis-vinylpyridine nickel(ii), with polyaromatic hydrocarbons were formed by a variety of methods such as solution crystallization, grinding, slurrying and co-melting; single crystal structures and kinetic properties are discussed.

Secondary Interactions in Halogenated Werner Clathrates

“…[NiCl 2 (4PIC) 8). These compounds were obtained by dissolving a mole of NiI 2 (40 mg, 0.128 mmol) in distilled water and 1 mol of iodine (I 2 : 32.51 mg, 0.128 mmol) in acetonitrile.…”

“…Barbour et al also used solid–solid grinding methods to synthesize [NiCl 2 (4-PhPy) 4 ], [CoCl 2 (4PhPy) 4 ], the solid solution [Ni 0.5 Co 0.5 Cl 2 (4PhPy) 4 ], and studied their clathrates with the isomers of xylene as guests . More recently, Wicht , has investigated the inclusion of xylenes by [Ni­(NCS) 2 (isoquinoline) 4 ] and has explored the host [Ni­(NCS) 2 (4-vinylpyridine) 4 ] in its clathrate formation with a series of polyaromatic hydrocarbons. The host formed by Ni­(NCS) 2 and the mixed ligands isoquinoline/4-phenylpyridine has been utilized to discriminate the xylene isomers and the desorption kinetics and packing properties have been examined …”

Reversible single-crystal to single-crystal phase transformation between a new Werner clathrate and its apohost

“…The potential utility of Werner complexes in separations is critically dependent upon both the selectivity of Werner clathrates towards the components of a mixture and whether or not guest uptake/ removal is reversible. [19][20][21][22][23][24][25][26][27] A survey of the literature has revealed that some Werner complexes can exhibit reversible sorption isotherms between their non-porous and porous phases. We recently termed such complexes Switching Adsorbent Molecular Materials (SAMMs).…”