Jul 6 – 10, 2015
Institute of Nuclear Physics PAN, Kraków
Europe/Warsaw timezone

Optical activity and switchable luminescence in octacyanido-based bimetallic layered magnets

Jul 8, 2015, 12:50 PM
15m
Institute of Nuclear Physics PAN, Kraków

Institute of Nuclear Physics PAN, Kraków

Crown Piast Hotel
multifunctional materials Molecular magnets

Speaker

Dr Szymon Chorąży (Department of Chemistry, The University of Tokyo)

Description

Molecule-based magnets constructed of octacyanidometallates and complexes of 3d/4f metal ions are now attracting a considerable attention as they reveal the wide range of magnetic phenomena including ferromagnetism, metamagnetism, charge transfer or spin transitions, and slow relaxation of magnetization.[1] The implementation of other physical functionalities, including chirality, luminescence, ionic conductivity, microporosity, or photoinduced phase transitions into magnetic octacyanido-based material results in extraordinary cross-effects, such as a magnetization-induced second harmonic generation, or photoswitchable second harmonic light, occurring when chirality is combined with photoinduced magnetic ordering.[2,3] In this context, we focus on searching for new synthetic pathways towards [M(CN)8]-bridged magnets with additional optical functionalities, which were found to be the most promising in the interactions with magnetic phenomena.[3] Here, we present two novel types of two-dimensional bimetallic cyanido-bridged networks combining magnetic ordering with embedded optical functionalities: (a) chiral {[MnII(R-mpm)2]2[NbIV(CN)8]}·4H2O and {[MnII(S-mpm)2]2[NbIV(CN)8]}·4H2O (mpm = α-methyl-2-pyridine-methanol) ferrimagnets with Tc = 23.5 K revealing natural optical activity due to the chiral crystal structure, and magnetic optical acitivity in the presence of external magnetic field, with the strong enhancement in the magnetically ordered phase,[4] and (b) {[TbIII(Box)2(dmf)2][WV(CN)8]}⋅H2O (Box = bis(oxazoline)) ferrimagnets with Tc = 2.4 K exhibiting visible green to red luminescence switchable by excitation light.[5] [1] B. Nowicka, T. Korzeniak, O. Stefanczyk, D. Pinkowicz, S. Chorazy, R. Podgajny and B. Sieklucka, Coord. Chem. Rev. 2012, 256, 1946. [2] S. Chorazy, K. Nakabayashi, K. Imoto, J. Mlynarski, B Sieklucka and S. Ohkoshi, J. Am. Chem. Soc. 2012, 134, 16151. [3] S. Ohkoshi, S. Takano, K. Imoto, M. Yoshikiyo, A. Namai and H. Tokoro, Nature Photonics 2014, 8, 65. [4] S. Chorazy, R. Podgajny, W. Nitek, T. Fic, E. Görlich, M. Rams and B. Sieklucka, Chem. Commun. 2013, 49, 6731. [5] S. Chorazy, K. Nakabayashi, S. Ohkoshi and B. Sieklucka, Chem. Mater. 2014, 26, 4072.

Primary author

Dr Szymon Chorąży (Department of Chemistry, The University of Tokyo)

Co-authors

Prof. Barbara Sieklucka (Faculty of Chemistry, Jagiellonian University, Kraków) Dr Edward Gorlich (Institute of Physics, Jagiellonian University, Kraków) Dr Koji Nakabayashi (Department of Chemistry, The University of Tokyo) Dr Michał Rams (Institute of Physics, Jagiellonian University, Kraków) Dr Robert Podgajny (Faculty of Chemistry, Jagiellonian University, Kraków) Prof. Shin-ichi Ohkoshi (Department of Chemistry, The University of Tokyo) Dr Wojciech Nitek (Faculty of Chemistry, Jagiellonian University, Kraków)

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