“…A search of the Cambridge Structural Database (CSD; Version 5.40, November 2018 update; Groom et al, 2016) for the BF 3 H 2 O moiety yielded six structures: the crown ether adducts 18-crown-6 monoaquatrifluoridoboron toluene semisolvate (CSD refcode SIXFOU; Bott et al 1991), 18-crown-6 bis(monoaquatrifluoridoboron) dihydrate (LEKYIJ; Feinberg et al 1993, Simonov et al, 1995 and dicyclohexano-18-crown-6 bis(monoaquatrifluoridoboron) (NIYGAD; Fonar et al, 1997); the phosphane oxide adduct monoaquatrifluoridoboron bis(triphenylphosphane oxide) (XATWAR; Chekhlov, 2005); two transition-metal coordination compounds [CIGVUJ10 (Van Rijn et al, 1987) and UKAJIA (Orain et al, 2010)], containing cocrystallized monoaquatrifluoridoboron moieties. As mentioned above, in addition to these reports on compounds having organic components, there is the report of Mootz & Steffen (1981b) on the inorganic parent compound BF 3 H 2 O and there are two reports on the dihydrate BF 3 H 2 OÁH 2 O (Mootz & Steffen, 1981c;Bang & Carpenter, 1964).…”