Double channel host lattice

Mak TCW, BruinsSlot HJ, Beurskens PT (1986) Tfetraethylammonium chloride tetrahydrate, a double channel host lattice constructed from (H20)4 C1- tetrahedra linked between vertices. J Indus Phenom 4 295-302... 

As mentioned in Section 13.5.1, the transient species [BO(OH)2]-has been stabilized by hydrogen-bonding interactions with the nearest urea molecules in the host framework of the inclusion compound [(CH3)4N]+[B0(0H)2]--2(NH2)2C0-H20. A perspective view of the crystal structure along the [010] direction is presented in Fig. 20.4.16. The host lattice consists of a parallel arrangement of unidirectional channels whose cross section has the shape of a peanut. The diameter of each spheroidal half is about 704 pm, and the separation between two opposite walls at the waist of the channel is about 585 pm. The well-ordered tetramethylammonium cations are accommodated in double columns within each channel. 

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