Chromic Platinum Complexes Containing Multidentate Ligands

Platinum(II) complexes display versatile chromic behavior as a consequence of their square planar geometry, which enables intra‐ and intermolecular Pt⋅⋅⋅Pt interactions via open axial coordination sites. These metallophilic interactions are known to generate metal‐metal‐to‐ligand‐charge transfer (MM...

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Bibliographic Details
Published in:European journal of inorganic chemistry 2021-03, Vol.2021 (10), p.894-906
Main Authors: Soto, Miguel A., Kandel, Raksha, MacLachlan, Mark J.
Format: Article
Language:English
Subjects:
Charge transfer
Chromism
Coordination chemistry
Coordination compounds
Encryption
Functional groups
Inorganic chemistry
Ligands
Memory devices
Metal-metal bonding
Optoelectronics
Platinum
Solvatochromism
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Summary:Platinum(II) complexes display versatile chromic behavior as a consequence of their square planar geometry, which enables intra‐ and intermolecular Pt⋅⋅⋅Pt interactions via open axial coordination sites. These metallophilic interactions are known to generate metal‐metal‐to‐ligand‐charge transfer (MMLCT) transitions, in addition to the ligand‐to‐ligand charge transfer (LLCT) and metal‐to‐ligand‐charge‐transfer (MLCT) transitions that are already present. The electronic properties of such complexes, and consequently the magnitude and intensity of these transitions, can be modulated by various functional groups as well as environmental factors, affording control over the color and luminescence. The responsive behavior of these complexes makes them attractive candidates for chromic devices with applications in memory, encryption, sensors, and optoelectronics. This Minireview summarizes the mechanisms and reversibility of optical chromism in platinum(II) complexes, with a focus on the recent developments in the literature. Chromic phenomena offer an expeditious way to gain visual information about changes in a medium upon the application of a stimulus. In this minireview, we survey recent efforts that report chromic platinum complexes using multidentate ligands. In particular, we discuss the effect of solvents (solvatochromism and vapochromism), temperature, mechanical force, pH, electric potential, light, and ions. The most common mechanisms that make chromism feasible are also covered.
ISSN:1434-1948
1099-0682
DOI:10.1002/ejic.202001117