The crystal structure of mu -hydroxo-bis{[N-isopropyl-2-(isopropylamino)tro
ponimino-N,N'](methyl)gallium(II)} tetrakis(pentafluorophenyl)borate (tropo
nimine is 2,4,6-cycloheptatrien-1-imine), [Ga-2(C14H22N2)(2)(OH)]B(C6H5)(4)
, is discussed. The two (Pr-i(2)-ATI)GaMe (ATI is aminotroponimime) units o
f the dinuclear cation are linked by a bridging hydroxo group and are both
slightly twisted from planarity.