NICODOM IR Inorganics (1803 spectra)

The infrared spectral library "NICODOM IR Inorganics" contains 1.803 infrared spectra of inorganic and related substances. It can be delivered as a book or a scanned book (*.pdf file). The spectra are printed in 4 volumes. The digital searchable library is distributed exclusively via Thermo sales channels.

Go to description of the volumes:

Volume I. contains 600 spectra of minerals

Volume II. contains 296 spectra of boron compounds

Volume III. contains 698 spectra of inorganic compounds (663 in KBr pellets and 35 as nujol mulls)

Volume IV. contains 219 spectra of inorganic commercial materials

Download list of spectra for this library.

Brief description of the library

Infrared spectroscopy has been commonly used for analysis of organic molecules. Inorganic analysis has been done less frequently. There are several reasons for that:

1. Some typical inorganic compounds are not molecules but have ionic structure, vibrational spectra in the typical IR region do not exist, are too weak or not characteristic enough compared to organic molecules

2. Most inorganic compounds include heavy atoms, their vibrations do not appear in common middle infrared region (4000 - 400 cm-1) but in far infrared region (under 400 cm-1) or Raman spectroscopy is used

3. Spectra of typical inorganic compounds have usually broad bands compared to organic molecules

4. Inorganic chemists prefer other than spectral analytical methods

5. Infrared spectra of inorganic compounds are more difficult to obtain

Also the choice of measurement technique is here more difficult than by organics. The common sampling method of KBr pellet cannot be used in all cases, as KBr is also an inorganic compound and several types of solid phase reactions with the sample may appear, like ion exchange, precipitation, redox reaction and decomposition. Furthermore many inorganic compounds are hydrates causing also technical difficulties in preparation of KBr pellets. For this type of samples where KBr pelet technique seems to be irreproducible nujol mulls technique is prefered. Other techniques like diffuse reflectance or ATR are less suitable for creating a spectral library. Such spectra would be more difficult to interpret and to reproduce as their shape is influenced by particle size and refractive index of the sample.

From those reasons not many spectral libraries of inorganic compounds are commercially available or they are collected on older dispersive instrument /6/. Nevertheless infrared spectroscopy can be successfully used for analysis of inorganic compounds and a spectral database can be very helpful here, as shown in this work. 

The purpose of this work was to build a representative collection of IR spectra of inorganic compounds to allow comparison of unknown inorganic sample with the database and identification of unknown inorganic sample. 

In our work the definition of inorganic compounds was extended to more groups of compounds which can be found in modern inorganic laboratory, like organometalic compounds, salts of organic acids, metal complexes with organic ligands, common organic ligands, organic indicators and dyes used in inorganic analysis and a few commonly used organic compounds.

The samples were taken from many different sources. Most samples were available from original commercial packings with declared purity, but some samples (typically boron compounds, metal complexes) were synthesised in local laboratories and no information about their purity was available. 

The spectra were collected using Nicolet FTIR spectrometers Nicolet 740, Impact 410 and Nicolet 210 equipped with Ge/KBr beamsplitter and dGTS/KBr detector. The collection time was about 1 minute (64 scans) for background and sample. The spectrometer was purged with dry air.

To prepare KBr pellets, about 2 mg of sample were taken, grinded 1-2 minutes together with about 200 mg of KBr (FT-IR grade, Fluka, dried). The pellets were pressed in a dye under vacuum for 4-6 minutes at 12t pressure to produce transparent disks about 1mm thick and 13mm in diameter. The samples were not dried before preparation. An empty KBr pellet was used as reference and its spectrum was subtracted from the sample spectrum to suppress the spectral artifacts caused by KBr impurities and water.

Nujol mulls were prepared in agate mortar by mixing the sample with nujol. The nujol spectrum was not subtracted. Liquid samples were dropped on a KBr window which was covered by second KBr window.

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

To download the list of spectra from this library, to download a free demo library compatible with your software, to check the format compatibility as well as for pricelist, ordering info and information about all NICODOM IR/NIR Libraries and other NICODOM products please visit our webpage.

NICODOM IR Inorganics, 1803 IR spectra of inorganics

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