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Solvatochromism is the ability of a chemical substance to change color due to a change in solvent polarity. Negative solvatochromism corresponds to hypsochromic shift (or blue shift) with increasing solvent polarity. The corresponding bathochromic (or red) shift is termed positive solvatochromism. The sign of the solvatochromism depends on the difference in dipole moment between the ground and excited states of the chromophore.

The Solvatochromic effect or solvatochromic shift refers to a strong dependence of absorption and emission spectra with the solvent polarity. Since polarities of the ground and excited state of a chromophore are different, a change in the solvent polarity will lead to different stabilization of the ground and excited states, and thus, a change in the energy gap between these electronic states. Consequently, variations in the position, intensity, and shape of the absorption spectra can be direct measures of the specific interactions between the solute and solvent molecules.

Due to the Franck-Condon principle (atoms do not change position during light absorption), the excited state solvent shell is not in equilibrium with the excited state molecule ("solute"). In fact, charge-transfer transitions of ground state ion-pairs give the largest changes in absorption spectra, and are thus, the most useful for measuring solvent polarity.

An example of positive solvatochromism is the 4,4'-bis(dimethylamino)fuchsone, which is orange in nonpolar toluene, red in slightly polar acetone, and red-violet in more polar methanol.

Examples of negative solvatochromism are 4-(4'-hydroxystyryl)-N-methylpyridinium iodide, which is red in 1-propanol, orange in methanol, and yellow in water.

Charge transfer bands

Charge transfer bands (CT) in electronic spectra involve promotion of an electron from an orbital that is predominantly metal in character to an orbital that is predominantly ligand in character (MLCT) or the reverse (LMCT). The energies of such bands are characteristically sensitive to solvent polarities. In fact, CT character is often identified with solvatochromism - change in transition frequency with change in solvent dielectric constant. LMCT bands are observed in the visible region of a spectrum for many high oxidation state metal complexes. One example is MnO₄^- MLCT bands are observed when the metal is in a low oxidation state and the ligands have low-lying acceptor orbitals e.g. $\pi$* orbitals of aromatic ligands such as diimines (e.g., bipy) and CN^-, CO, and NO..

Uses

The main value of the concept of solvatochromism is the context it provides to predict colors of solutions. Solvatochromism can in principle be used in sensors and in molecular electronics for construction of molecular switches.

See also

• Bathochromic shift
• Hypsochromic shift
• Brooker's merocyanine

References

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.

External links

• Negative solvatochromism experiment
• Positive solvatochromism experiment
• What is Solvatochromism? A quanto-mechanical revisitation

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