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Hydrated Oxocarbons, III. Structural Investigations on Solid State Polymerization and Depolymerization of Thermochromic 2,6‐Diorgano‐1,3,5,7‐tetraoxa‐2,6‐dibora‐4,8‐octalindiones
Author(s) -
Yalpani Mohamed,
Boese Roland,
Bläser Dieter
Publication year - 1983
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19831161010
Subject(s) - chemistry , thermochromism , depolymerization , solid state , polymerization , derivative (finance) , molecule , polymer chemistry , medicinal chemistry , polymer , stereochemistry , organic chemistry , financial economics , economics
The structure of the thermochromic compound 2,6‐diethyl‐1,3,5,7‐tetraoxa‐2,6‐dibora‐4,8‐octalindione ( 1 ) in the high‐temperature (“hot”) form 1a and the low‐temperature (“cold”) form 1b as well as that of the non‐thermochromic phenyl derivative 2 have been determined by X‐ray analysis. The colour change is the result of a chelation‐dechelation reaction involving the boron atoms of one and the carbonyl oxygens of the neighbouring molecules. In the “cold” form the crystals consist of stacked polymer layers. The mechanism of this process is discussed.