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X-ray powder diffraction data for three red azo pigments: sodium, barium, and ammonium lithol salts

Published online by Cambridge University Press:  29 June 2017

Alicja Rafalska-Łasocha ,
Marta Grzesiak-Nowak ,
Piotr Goszczycki ,
Katarzyna Ostrowska  and
Wiesław Łasocha
Alicja Rafalska-Łasocha*
Affiliation:
Faculty of Chemistry, Jagiellonian University, 30-060 Krakow, Poland
Marta Grzesiak-Nowak
Affiliation:
Faculty of Chemistry, Jagiellonian University, 30-060 Krakow, Poland
Piotr Goszczycki
Affiliation:
Faculty of Chemistry, Jagiellonian University, 30-060 Krakow, Poland
Katarzyna Ostrowska
Affiliation:
Faculty of Chemistry, Jagiellonian University, 30-060 Krakow, Poland
Wiesław Łasocha
Affiliation:
Faculty of Chemistry, Jagiellonian University, 30-060 Krakow, Poland Jerzy Haber Institute of Catalysis and Surface Chemistry PAS, 30-239 Krakow, ul. Niezapominajek 8, Poland
*
a)Author to whom correspondence should be addressed. Electronic mail: [email protected]
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Abstract

Lithol reds belong to the group of azo pigments, which were popular artists’ colouring materials in the first half of the twentieth century. These pigments were also used in many branches of industry. Here, we report X-ray powder diffraction data, unit-cell parameters, and space groups for three compounds from this group: sodium (E)-2-((2-hydroxynaphthalen-1-yl)diazenyl)naphthalene-1-sulphonate monohydrate (Na lithol red), monoclinic, space group C2/c, with cell parameters a = 33.343(7), b = 6.667(2), c = 16.397(4) Å, β = 90.83°, V = 3644.51 Å3, Z = 8; barium (E)-2-[(2-hydroxynaphthalen-1-yl)diazenyl]naphthalene-1-sulphonate trihydrate (Ba lithol red), monoclinic, space group P21/m, with cell parameters a = 17.758(9), b = 6.209(4), c = 16.857(8) Å, β = 92.07°, V = 1857.39 Å3, Z = 2; and ammonium (E)-2-[(2-hydroxynaphthalen-1-yl)diazenyl]naphthalene-1-sulphonate monohydrate (NH4 lithol red), monoclinic, space group P2/c, with cell parameters a = 17.721(5), b = 6.428(3), c = 16.911(5) Å, β = 100.31(3)°, V = 1895.31 Å3, and Z = 4. In the first and third cases we synthesised the pigments in their monohydrate form, performed X-ray powder diffraction measurements, and indexed all of the obtained diffraction maxima. In the case of the barium compound, despite many efforts in the course of the synthesis procedure, the powder diffraction patterns of the obtained samples were not of the best quality. Nevertheless, we indexed the best one and found a reliable space group and cell parameters.

Keywords

azo pigmentslithol saltspowder diffractometry
Type
New Diffraction Data
Information
Powder Diffraction , Volume 32 , Issue 3 , September 2017 , pp. 187 - 192
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Copyright
Copyright © International Centre for Diffraction Data 2017 

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