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Valence Bond Theory

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

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Updated: Oct 6, 2025

Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents

Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents

Published on: May 28, 2014

Dicarboxylate Modulating Molecular-Ionic Platinum Compounds with Variable Stacking and Photoluminescence.

Ruo-Yi Zhang¹, Ming-Hui Cui¹, Wei-Wei Wang¹

¹School of Chemistry and Chemical Engineering, TKL of Organic Solar Cells and Photochemical Conversion, Tianjin Key Laboratory of Drug Targeting and Bioimaging, Tianjin University of Technology, Tianjin 300384, P. R. China.

Inorganic Chemistry

|January 14, 2022

Summary

Ten new platinum compounds were synthesized using N-(1-iminoethyl)acetamidine (NIA) ligands. The dicarboxylate counterions influenced crystal packing and photoluminescence, resulting in blue, green, and red-shifted emissions with varied thermal quenching properties.

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A Novel Technique for Generating and Observing Chemiluminescence in a Biological Setting

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Published on: March 9, 2017

Area of Science:

Coordination Chemistry
Materials Science
Photophysics

Background:

Molecular-ionic platinum compounds offer tunable properties for optoelectronic applications.
Understanding the influence of counterions on platinum complex structure and photoluminescence is crucial for materials design.

Purpose of the Study:

Synthesize and characterize novel molecular-ionic platinum compounds.
Investigate the effect of dicarboxylate ligands on crystal structure and photoluminescence.
Analyze the temperature-dependent photoluminescence behavior, including thermal quenching.

Main Methods:

Solvothermal synthesis of platinum complexes.
Single-crystal X-ray diffraction for structural analysis.
Photoluminescence spectroscopy (emission spectra and variable-temperature studies).

Main Results:

Ten [Pt(NIA)2]·(L)·nH2O compounds were synthesized, where L is a dicarboxylate.
Dicarboxylate ligands dictated crystal packing and influenced photoluminescence color (blue, green, red-shifted).
Compounds 8 and 10 exhibited distinct thermal quenching zones, while compound 9 showed negative thermal quenching at low temperatures.

Conclusions:

The dicarboxylate counterions play a critical role in modulating the solid-state structure and photoluminescent properties of [Pt(NIA)2]2+ compounds.
The synthesized platinum complexes display diverse emission colors and temperature-dependent luminescence behaviors, highlighting their potential for optoelectronic applications.