NICODOM IR Inorganics Volume II - Boron Compounds 

Volume 2 of the infrared spectral library book "NICODOM IR Inorganics"  presents 296 FTIR spectra of boron compounds (spectral range 4000-400cm-1). The spectra are shown in transmittance scale (%T). The source of the samples was the Institute of Inorganic Chemistry of Czech Academy of Science in Rez near Praha, Czech Republic.

All substances were synthesized on this institute. The structure and purity of the compounds was verified by common analytical methods, mostly NMR, mass spectroscopy and X-ray analysis. The samples were not additionally purified or dried before collecting, they were taken as they were available from the institute stock.


Boron chemistry forms a bridge between organic chemistry, inorganic chemistry and the chemistry of metals. After the discovery of the first boranes in 1912, these compounds were considered to be of only academic importance. The first borane boom started in 1941, when the use of volatile uranium borohydride was proposed for the separation of uranium isotopes. The second boom for cage boranes started in 1946 when liquid (B5H9) and solid (B10H14) boranes were believed to be most powerful rocket fuels. In the next decades further systematic but less well-supported research continued.

In presented collection FTIR spectra of different types of boron compounds are shown. From a high number of available compounds we took only solid samples which are considered not to decompose on the air or in KBr pellets with the aim to build a representative collection of this type of compounds.

The boron or combined skeletons of the various polyhedra are designated by the Greek terms "closo" (closed), "nido" (nestlike), "arachno" (weblike) and "hypho" (netlike); the order indicates increasing openness. "Closo" molecules have a complete closed polyhedron with triangular faces. "Nido" molecules have nonclosed structures, they can be considered to arise by removing the highest connected vertex in a closo structure. "Arachno" molecules are obtained by removing from the nido cluster the highest connected atom of the opened face. "Hypho" molecules are even more opened.

Borates are anions of boranes usually stabilised by large cations. Carbaboranes and carbaborates are boranes or borates, where one or more Boron atoms from the skeleton are substituted by carbon atoms. Further presented derivatives are thiaboranes (include S-atoms in skeleton), azaboranes (include N-atoms in skeleton) and metallaboranes or carbametallaboranes (include metal atoms in skeleton).

This library is available as printed book or scanned book (*.pdf file).

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NICODOM IR Inorganics, 1803 IR spectra of inorganics

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