Phase transformation induced mechanochromism in a platinum salt: a tale of two polymorphs
Amie E. Norton, Mahmood Karimi Abdolmaleki, Jiamin Liang, Malvika Sharma, Robert Golsby, Ann Zoller, Jeanette A. Krause, William B. Connick, Sayandev Chatterjee
Abstract
Red crystals of [Pt(tpy)Cl]NO3·HNO3 show mechanochromic behaviour turning yellow when pressure is applied. The electronic character and spectroscopic signature of the red and yellow polymorphs change as a result of slipping of the molecular stacking planes in the solid state. The slippage alters the PtPt intermolecular distances from a linear stacked motif with <3.5 Å separations in the red polymorph to a less stacked motif of alternating short intradimer and long interdimer interactions in the yellow polymorph.
Topics & Concepts
CrystallographySlippingIntermolecular forceStackingMaterials scienceSolid-statePhase (matter)Structural motifStereochemistryChemistryMoleculeOrganic chemistryPhysical chemistryMechanical engineeringEngineeringBiochemistryLuminescence and Fluorescent MaterialsCrystallography and molecular interactionsForce Microscopy Techniques and Applications