Unprecedented 30 K hysteresis across switchable dielectric and magnetic properties in a bright luminescent organic–inorganic halide (CH6N3)2MnCl4. Issue 16 (8th April 2019)

• Record Type: Journal Article
• Authors: Sen, Abhijit; Swain, Diptikanta; Guru Row, Tayur N.; Sundaresan, A.
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 16(2019)
• Page Start: 4838
• Page End: 4845
• Publication Date: 2019-04-08
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9tc00663j
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Highly luminescent hybrid (CH6 N3 )2 MnCl4 featuring unique (Mn3 Cl12 ) 6− units in the crystal structure, exhibits a remarkable 30 K hysteresis across dielectric and magnetic switching. Abstract : Multifunctional materials that exhibit various switchable properties and simultaneously feature excellent luminescent properties boast tremendous technological importance. However, realization of such materials is still elusive, as integration of these independent yet technologically important properties in single materials is fairly challenging. Here, we report a new highly photoluminescent hybrid (CH6 N3 )2 MnCl4 (CH6 N3 = guanidinium cation, GC) that exhibits an unprecedented 30 K wide hysteresis in dielectric and magnetic switching across the structural phase transition (SPT). The compound uniquely features trimeric (Mn3 Cl12 ) 6− units composed of face-sharing MnCl6 octahedra in its zero-dimensional crystal structure and undergoes a thermally induced reversible structural transition at 166/195 K. The high and low dielectric states show a remarkable 30 K wide reversible dielectric switching which is mainly portrayed by the relative population of quadrupolar and dipolar moments of disordered and ordered phases of GCs. Only a small change in the crystal volume across the transition is reflected in subtle magnetic switching. Moreover, the material exhibits an intense orange–red emission under ultraviolet excitation at room temperature with long lifetime (1.71 ms) and large quantum yield (39.5%). This report suggests a promising strategy to construct truly multifunctional optoelectronic materials and may be helpful to improve the understanding and control of switchable physical properties and luminescence in supramolecular materials.