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Non-Phase-Transition Luminescence Mechanochromism of a Copper(I) Coordination Polymer
Eunjin Kwon1, Jineun Kim1, Kang Yeol Lee1
1Department of Chemistry (BK21 plus) and Research Institute of Natural Science, Gyeongsang National University , Jinju 52828, Korea.
Abstract:
A copper(I) coordination polymer, [Cu2I2L2]n (CP 1), shows luminescence mechanochromism with a color change from greenish-blue to yellow upon the application of pressure. Powder X-ray diffraction and Raman studies reveal that the changes in the bond lengths in crystalline CP 1 are the main cause of luminescence mechanochromism. The luminescence mechanochromic process of CP 1 preserves its crystallinity with a small lattice distortion, despite very high pressure, and it is a non-phase-transition process. After the addition of several drops of acetonitrile to the ground and compressed samples, the original greenish-blue emissive and crystalline states are restored. Therefore, the luminescence color conversion processes are fully reversible.
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