“…TPPA [200], TEM [194], MP [195], conductivity measurements [220] [194,195,200,219,220] Hf(BH 4 ) 4 6. 78 136.4 [221] HfCl 4 , LiBH 4 [221][222][223][224][225][226][227][228] NaHfF 5 , Al(BH 4 ) 3 [229] Direct metathesis [221][222][223][224][225][226]229] In solution (diethyl ether [227,228]) VDH [222,229], EA [222,229], VPM [229], single crystal neutron diffraction [228], XRD [221], gas electron diffraction [225], DSC [221], TG-DSC-MS [221], IR [222,224,225], photoelectron spectroscopy [223], melting point [221,229], boiling point [229], C P [221], S Ho(BH 4 ) 3 5.77 252 [195] 236 [230] HoH 3 , S(CH 3 ) 2 *BH 3 [195] HoCl 3 , LiBH 4 [230] In solution (dimethyl sulfide-toluene mixture…”