Some symmetry aspects of layered-clathrate structures formed by Ni (NCS)2 (4-methylpuridine)4

Polymorphism and Pseudopolymorphism of the [Ni(4-Methylpyridine)4(NCS)2] Werner Complex, the Compound that Led to the Concept of “Organic Zeolites”

“…(3) Fourth order. Compounds with 1-methylnaphthalene, 1-bromonaphthalene, azulene, o -xylene, , and naphthalene . The first four crystallize in the P 2 1 / c ( P 2 1 / n ) space group with unit cell volume of more than 4000 Å, the last one in C 2/ c with unit cell volume of more than 8000 Å 3 .…”

“…The third type, the so-called γ-phases, are layer-type clathrates which are triclinic or monoclinic with a typical 1:2 host-to-guest ratio. The γ-phases form with o-xylene, 86,87 p-terphenyl, 88 azulene, 89 naphthalene, 90 and its derivatives. 89,91,92 A similar structure was also reported for [Cu(4-MePy) 4 (NCS) 2 ]*2(4-MePy).…”

“…The γ-phases form with o-xylene, 86,87 p-terphenyl, 88 azulene, 89 naphthalene, 90 and its derivatives. 89,91,92 A similar structure was also reported for [Cu(4-MePy) 4 (NCS) 2 ]*2(4-MePy). 93 In these compounds, guest removal is followed by the collapse of the structure.…”

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

“…6 In the 1980s, Lipkowski detailed how Ni(4-MePy) 4 (NCS) 2 forms clathrates with 1-bromonaphthalene and azulene. 7 Lipkowski's group also studied clathrate formation in terms of kinetics and thermodynamic stability for Ni(4-MePy) 4 (NCS) 2 . 8 The term "Werner clathrate" was coined by Nassimbeni and co-workers in the 1980s, [9][10][11][12] who explored the versatility of [Ni(NCS) 2 (4-MePy) 4 ] complexes through substitution of the pyridine ligands and/or counterions and their clathrates with xylenes and other guests.…”

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

“…These include naphthalene as well as bromonaphthalene and azulene in layered clathrate structures with NiIJNCS) 2 (4-methylpyridine) 4 by Lipkowski and co-workers. 16 Having previously considered selectivity of xylene isomers with an isoquinoline-based Werner host, 17 we now present the results of inclusion compounds formed between the Werner host bis-isothiocyanato tetrakis-vinylpyridine nickel(II), H, with the PAHs shown in Scheme 1. This compound is an example of a Werner host, of general formula MX 2 L 4 , where M is a divalent metal cation (e.g.…”