Infrared Spectra of the Crystalline Inorganic Borates

. Infrar ed absorp t ion spectra of a n hydrous, crystalline, inorgani c borates were obtained lLl ~he .2000 cmI to 300 cmI ra nge. Compounds wit h B'O a nd B " isotopes were prepa red to ass Ist lI1 terpretatlOn . Spectra l bands for all or t hoborates and py roborates a nd som e meLaborates could be assigned sat isfactorily . Borates wit h complex rin gtype an ion s genera lly e~'(hlblted spectra of such complex ity t hat on ly s uperfi cial in terp retation WItS attempLed. }< rom correlatlOlI s between s pectra a nd stru cture It appears t hat boron in 3-fold or in 4-fold coordin at ion can be iden t ifi ed wi t h r easonable assuran ce on t he bas is of t he infrared spectrum alon e. Absorp t ion bands ar c ta,bulated for about 80 borates a lld typ ical sp ectra a rc s hown .