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Effect of alkyl chain length on thermochromism of novel nitro compounds
Authors:Sang Cheol Lee  Young Gyu Jeong  Suk Hyun Jang  Won Ho Jo
Institution:(1) School of Advanced Materials and Systems Engineering, Kumoh National Institute of Technology, 730-701 Kumi, Korea;(2) Hyperstructured Organic Materials Research Center and School of Materials Science and Engineering, Seoul National University, 151-742 Seoul, Korea
Abstract:A series of novel nitro compounds containing different alkyl chain length (x=2∼5), 1,5-bis(hydroxyalkylamino)-2,4-dinitrobenzene (BDBx), are synthesized and their thermochromic behavior is investigated by using differential scanning calorimetry and optical microscopy. All the BDBx crystals synthesized show yellow color at room temperature. BDBx (x=2∼4) samples display orange color even in the solid when heated above respective thermochromic transition temperature, while the yellow color of BDB5 changes to orange with melting. The orange color of BDBx crystals returns to yellow when cooled down to room temperature, indicating that the thermochromic behavior of BDBx is reversible. The thermochromic transition temperatures of BDBx crystals are found to be decreased with increasing the alkyl chain length, exhibiting evenodd fluctuation.
Keywords:Thermochromism  Thermochromic transition temperature  Even-odd fluctuation
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