Generally, due to spin-orbital coupling, the metallocages based on heavy metals should not show emissive properties. But, many Pt(II) based metallocages show emissive properties and at the same time Pd(II) based matallocages dont show the same, even though Pt is heavier than Pd.
Hi,
It is very well known that many Pt(II) complexes exhibit emissive properties, in contrast there are very few examples of highly emissive Pd(II) complexes. The non allowed quantum transitions due to heavy atom effect is exhibited to a much higher degree in Pt(II) complexes because the Pt(II) is heavier than Pd(II).
Compare the Pt(II) and Pd(II) sections in this review it will give You a more detailed answer.
Cheers,
Kaspars
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Also, this may be help,
http://pubs.acs.org/doi/abs/10.1021/acs.macromol.7b00171?src=recsys&journalCode=mamobx
There is also a number of articles that directly compare Pt(II) with Pd(II) analogs. In these systems low temperatures (below 77K) were required to cause emission. Hope this helps:
http://pubs.acs.org/doi/pdf/10.1021/ic50217a029
http://pubs.acs.org/doi/pdf/10.1021/ic50166a015
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