“… 6 , 27 − 33 This interest was significantly increased with the first porous SCO coordination polymers reported, since they additionally afforded the prospect of investigating the impact of host–guest interactions on the SCO properties. In this context, the family of doubly interpenetrated two-dimensional Fe II SCO coordination polymers generically formulated as [Fe(L) 2 (NCS) 2 ]@Guest, L being the bis-monodentate pyridine-type bridging ligands tvp ( trans -(4,4′-vinylenedipyridine)), 34 azpy (4,4′-azopyridine), 35 bpbd (2,3-bis(4′-pyridyl)-2,3-butanediol), 36 , 37 bpe (1,2-bis(4′-pyridyl)ethane), 38 and bped ( dl -1,2-bis(4′-pyridyl)-1,2-ethanediol) 39 has had a pivotal influence on the field. Recently, a number of clathrates of the type [Fe(tvp) 2 (NCS) 2 ]@Guest ( 1@G ) were reported with a variety of guests such as water, acetonitrile, dimethylacetamide, dimethylsulfoxide, benzonitrile, benzaldehyde, and nitrobenzene.…”