Nov 7, 2015 · Colored compounds of transition elements are associated with partially filled (n-1)d orbitals. Tthe transition metal ions containing unpaired d-electrons undergoes an electronic transition from one d-orbital to another.

Feb 5, 2025 · Pure vanadium metal surface can be colored purple by a layer of oxides and nitrides formed by reaction with air at some temperature and duration. The compounds and their mixtures as bulk material are not purple, but the right thickness of layer can make them purple. The other properties hold true as well.

Feb 19, 2018 · I know that transition metals make colored compounds when they forms a bond with a ligand, as the ligand increases the energy level of $\ce{d_{x^2-y^2}}$ and $\ce{d_{z^2}}$ orbital by repelling these orbitals with the lone pair electrons of the ligand.

May 31, 2015 · As far as my knowledge goes, transition metal complex ions show a color due to a transfer of electrons between the levels of split $\\mathrm d$-orbitals. In the case of $\\ce{V^5+}$ and $\\ce{Cr^6+}$

Nov 11, 2014 · The feature that makes colored compounds colored is the one that makes the compounds easily oxidized. When the compound is oxidized, something does not exist anymore. I'm not giving you a straight answer since you will experience a nice enlightenment when you figure that out. Take a look at the structure of beta-carotene, for example.

Oct 28, 2015 · Also, chromate is also colored wherein $\ce{Cr^{VI}}$ is a $\ce{d^0}$ ion, therefore its not absorbing radiation due to electrons jumping to higher orbitals in the crystal field. What is causing it to absorb visible radiation?

Jun 4, 2015 · I know that anthocyanins are a class of compounds responsible for the purple colors found in flower petals. Anthocyanins (also anthocyans; from Greek: ἀνθός (anthos) = flower + κυανός (kyanos) = blue) are water-soluble vacuolar pigments that may appear red, purple, or blue depending on the pH. (same reference as above)

Yes, it is all about the absorption of light at specific wavelength.. Azobenzene, the parent compound has an absorption maximum around $\lambda$= 430 nm in the visible spectrum.

Dec 18, 2019 · Here, the impurity is the solute, and the aluminium oxide is the solvent. These impurities generally bind to the oxygen atoms, so it could be said that these impurities form coordination compounds (oxo complexes) dispersed inside the solid solvent. Note that formation of solid solutions is common in many situations, and not at all limited to ...

May 26, 2015 · Also, note that colored compounds only result when 1.8 < Band gap < 3.0. Larger gaps give white/transparent & smaller gaps give a black colour to compounds. (The band gap in ZnS is 3.54, the band gap in CdS is 2.45.)