Structural and physical properties of a new reversible and continuous thermochromic ionic liquid in a wide temperature interval: [BMIM]4[Ni(NCS)6]

Elena López Lago; Julio A. Seijas; Imanol de Pedro; Jesús Rodríguez Fernández; M. Pilar Vázquez-Tato; Jesús Antonio González; Esther Rilo; Luisa Segade; Oscar Cabeza; Carlos Damián Rodríguez Fernández; Yago Arosa; Bilal S. Algnamat; Luis M. Varela; Jacobo Troncoso; Raúl de la Fuente

doi:10.1039/C8NJ03294G

Structural and physical properties of a new reversible and continuous thermochromic ionic liquid in a wide temperature interval: [BMIM]₄[Ni(NCS)₆]†

Elena López Lago,

*^a Julio A. Seijas,

^b Imanol de Pedro,^c Jesús Rodríguez Fernández,^c M. Pilar Vázquez-Tato,^b Jesús Antonio González,^c Esther Rilo,^d Luisa Segade,^d Oscar Cabeza,

^d Carlos Damián Rodríguez Fernández,^a Yago Arosa,^a Bilal S. Algnamat,^a Luis M. Varela,

^a Jacobo Troncoso

^e and Raúl de la Fuente

^a

Author affiliations

* Corresponding authors

^a Nanomaterials, Photonics and Soft Matter Group (NaFoMat), Departamento de Física Aplicada e Departamento de Física de Partículas, Universidade de Santiago de Compostela, Campus Vida, 15782 Santiago de Compostela, Galicia, Spain
E-mail: elena.lopez.lago@usc.es

^b Departamento de Química Orgánica, Facultade de Ciencias, Universidade de Santiago de Compostela, Campus Lugo, 27080 Lugo, Spain

^c CITIMAC, Facultad de Ciencias, Universidad de Cantabria, 39005 Santander, Spain

^d Departamento de Física e Ciencias da Terra, Universidade da Coruña, A Coruña, Spain

^e Departamento de Física Aplicada, Universidad de Vigo, Escola de Enxeñaría Aeronáutica e do Espazo, Campus As Lagoas, 32004 Ourense, Spain

Abstract

We report spectroscopic, structural, optical and magnetic characterization of tetra(1-butyl-3-methylimidazolium)hexaisothiocyanatonickelate. This paramagnetic ionic liquid exhibits reversible and continuous thermochromism from 298 K up to 400 K and it is solar responsive resisting numerous heating–cooling cycles. Its appearance changes from pale blue to grass green from 298 K to 343 K. Well above these temperatures it becomes brown and gray. Thermochromism is observed both in the solid and liquid phase.

New Journal of Chemistry

Structural and physical properties of a new reversible and continuous thermochromic ionic liquid in a wide temperature interval: [BMIM]₄[Ni(NCS)₆]†

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Structural and physical properties of a new reversible and continuous thermochromic ionic liquid in a wide temperature interval: [BMIM]₄[Ni(NCS)₆]

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