Journal
CRYSTAL GROWTH & DESIGN
Volume 15, Issue 11, Pages 5183-5187Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.cgd.5b01199
Keywords
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [2014R1A1A4A01009105, 2015R1D1A4A01020317]
- National Research Foundation of Korea [2015R1D1A4A01020317, 2014R1A1A4A01009105] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Four solvent-responsive one-dimensional copper(I) coordination polymers (CPs), namely, {[Cu4I4L(MeCN)(2)]center dot CH2Cl2}(n) (1), {[Cu4I4L(MeCN)(2)]center dot CHCl3}(n) (2), {[Cu4I4L(MeCN)(2)]center dot 0.5p-xylene}(n) (3), and [Cu4I4L(MeCN)(2)](n) (4), were prepared by reaction of CuI with N,N'-bis[2-(cyclohexylthio)ethyl]pyromellitic diimide (L) via self-assembly under varying solvent conditions. CPs 1-4, which are pseudopolymorphic supramolecular isomers derived from solvent molecules, are composed of Cu4I4 cubane clusters. The ligands in CPs 1-3 adopted a synconformation, whereas in CP 4 they were observed in the anti-conformation. This occurred via syn to anti transitions upon heating, followed by exposure to MeCN vapor. In addition, a reversible anti to syn transition was achieved by agitating in mixed organic solvents. It was shown that ligand transition from the syn- to the anti-conformation occurred through crystal-to-amorphous-to-crystal transformations. Furthermore, CPs 1-3 exhibited reversible solvent exchange and crystal transformation by exposure to vapors from volatile organic compounds.
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