A MLCT-switched photochromic copper(II) coordination polymer with 1,2-bis(2 '-methyl-5 '-(4 ''-pyridyl)-3 '-thienyl)perfluorocyclopentene in crystalline phase

作者：Munakata Megumu^*; Han Jing; Maekawa Masahiko; Suenaga Yusaku; Kuroda Sowa Takayoshi; Nabei Atsuhiro; Ensu Hideaki

来源：Inorganica Chimica Acta, 2007, 360(8): 2792-2796.

DOI：10.1016/j.ica.2006.12.026

• diarylethene
• photochromism
• crystalline phase
• Cu(II) complex

A novel Cu(II) coordination polymer with photochromic 1,2-bis(2'-methyl-5'-(4 ''-pyridyl)-3'-thienyl)perfluorocyclopentene (BM-4-PTP) was prepared and crystallographically characterized. Its photochromic behavior as well as magnetic property was investigated in crystalline phase. In complex [Cu(BM-4-PTP)Br-2(DMF)(2)] (1), each copper atom is bridged by two N atoms of BM-4-PTP, two Br atoms from anions and two O atoms of DMF in an slightly distorted octahedral geometry. The basal planar center is in turn linked by bidentate ligand forming a 1-D polymeric chain. Free ligand showed typical spectral changes upon appropriate optical excitation, indicating the reversible photochromism in crystalline phase. Complex 1 occurred reversible photoisomerization not only through the pi-pi* transition but also the MLCT transition in crystalline phase. On the other hand, the magnetic property of complex 1 has been investigated by means of ESR. The spectra slightly and reversibly changed in response to UV and visible light supporting the normal photoreactivity in crystalline phase.

• 出版日期2007-5-30