YInMn Blue (/jɪnmɪn/; for the chemical symbols Y for yttrium, In for indium, and Mn for manganese), also known as Oregon Blue or Mas Blue, is an inorganic blue pigment that was discovered by Mas Subramanian and his (then) graduate student, Andrew Smith, at Oregon State University in 2009.[1][3] The pigment is noteworthy for its vibrant, near-perfect blue color and unusually high NIR reflectance.[2] The chemical compound has a unique crystal structure in which trivalent manganese ions in the trigonal bipyramidal coordination are responsible for the observed intense blue color. Since the initial discovery, the fundamental principles of colour science have been explored extensively by the Subramanian research team at Oregon State University, resulting in a wide range of rationally designed novel green, purple, and orange pigments, all through intentional addition of a chromophore in the trigonal bipyramidal coordination environment.[4][5]
^ abSmith, Andrew E.; et al. (2 December 2009). "Mn3+ in Trigonal Bipyramidal Coordination: A New Blue Chromophore". Journal of the American Chemical Society. 131 (47): 17084–17086. doi:10.1021/ja9080666. ISSN 0002-7863. PMID 19899792.
^ abSmith, Andrew E.; et al. (October 2016). "Spectral properties of the UV absorbing and near-IR reflecting blue pigment, YIn1−xMnxO3". Dyes and Pigments. 133: 214–221. doi:10.1016/j.dyepig.2016.05.029.
^Cascone, Sarah (20 June 2016). "The Chemist Who Discovered the World's Newest Blue Explains Its Miraculous Properties". Artnet News. Archived from the original on 4 April 2020.
^Li, Jun & Subramanian, M. A. (April 2019). "Inorganic pigments with transition metal chromophores at trigonal bipyramidal coordination: Y(In,Mn)O3 blues and beyond". Journal of Solid State Chemistry. 272: 9–20. Bibcode:2019JSSCh.272....9L. doi:10.1016/j.jssc.2019.01.019. S2CID 104373418.
^Li, Jun; et al. (13 September 2016). "From Serendipity to Rational Design: Tuning the Blue Trigonal Bipyramidal Mn3+ Chromophore to Violet and Purple through Application of Chemical Pressure". Inorganic Chemistry. 55 (19): 9798–9804. doi:10.1021/acs.inorgchem.6b01639. PMID 27622607.
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