Developing Intense Blue and Magenta Colors in alpha-LiZnBO3: The Role of 3d-Metal Substitution and Coordination

Tamilarasan, S and Reddy, M L P and Natarajan, S and Gopalakrishnan, J (2016) Developing Intense Blue and Magenta Colors in alpha-LiZnBO3: The Role of 3d-Metal Substitution and Coordination. In: Chemistry-An Asian Journal, 11 (22). pp. 3234-3240.

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Abstract

We describe the synthesis, crystal structures, and optical absorption spectra/colors of 3d-transition-metal-substituted alpha-LiZnBO3 derivatives: alpha-(LiZn1-xMxBO3)-B-II (M-II = Co-II (0 < x < 0.50), Ni-II (0 < x <= 0.05), Cu-II (0 < x <= 0.10)) and alpha-(Li1+xZn1-2xMxBO3)-B-III (M-III = Mn-III (0 < x <= 0.10), Fe-III (0 < x <= 0.25)). The crystal structure of the host alpha-LiZnBO3, which is both disordered and distorted with respect to Li and Zn occupancies and coordination geometries, is largely retained in the derivatives, which gives rise to unique colors (blue for Co-II, magenta for Ni-II, violet for Cu-II) that could be of significance for the development of new, inexpensive, and environmentally friendly pigment materials, particularly in the case of the blue pigments. Accordingly, this work identifies distorted tetrahedral MO4 (M = Co, Ni, Cu) structural units, with a long M-O bond that results in trigonal bipyramidal geometry, as new chromophores for blue, magenta, and violet colors in a alpha-LiZnBO3 host. From the L*a*b* color coordinates, we found that Co-substituted compounds have an intense blue color that is stronger than that of CoAl2O4 and YIn0.90Mn0.10O3. The near-infrared (NIR) reflectance spectral studies indicate that these compounds exhibit a moderate IR reflectivity that could be significant for applications as ``cool pigments''.

Item Type:	Journal Article
Publication:	Chemistry-An Asian Journal
Publisher:	WILEY-V C H VERLAG GMBH, POSTFACH 101161, 69451 WEINHEIM, GERMANY
Additional Information:	Copy right for this article belongs to the WILEY-V C H VERLAG GMBH, POSTFACH 101161, 69451 WEINHEIM, GERMANY
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	04 Jan 2017 05:35
Last Modified:	04 Jan 2017 05:35
URI:	http://eprints.iisc.ac.in/id/eprint/55863

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