The literature provides several attractive examples of
laboratory experiments devoted to the synthesis of transitionmetal
complexes that exhibit the “conventional” thermochromism
in the solid state.3 However, the latter behavior is based on
the temperature-dependent shift of the same band in the
emission spectrum, often due to a change in geometry, which is
a totally different physical phenomenon compared to that
discussed in this experiment. Because the activity hereby
presented is very short, it turned out to be particularly valuable
as a complement to a lab session dedicated to the synthesis of
one of these classical thermochromic complexes, based on
Cu(II).3g,4 Observing the two apparently similar effects and
contrasting the very different physical backgrounds from which
they are originated, students were stimulated to appreciate the
difference, allowing for a more articulated discussion of the
subject of thermochromism in the classroom.
The literature provides several attractive examples oflaboratory experiments devoted to the synthesis of transitionmetalcomplexes that exhibit the “conventional” thermochromismin the solid state.3 However, the latter behavior is based onthe temperature-dependent shift of the same band in theemission spectrum, often due to a change in geometry, which isa totally different physical phenomenon compared to thatdiscussed in this experiment. Because the activity herebypresented is very short, it turned out to be particularly valuableas a complement to a lab session dedicated to the synthesis ofone of these classical thermochromic complexes, based onCu(II).3g,4 Observing the two apparently similar effects andcontrasting the very different physical backgrounds from whichthey are originated, students were stimulated to appreciate thedifference, allowing for a more articulated discussion of thesubject of thermochromism in the classroom.
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