Reference of 14187-32-7. Let¡¯s face it, organic chemistry can seem difficult to learn. Especially from a beginner¡¯s point of view. Like 14187-32-7, Name is Dibenzo-18-crown-6. In a document type is Article, introducing its new discovery.
Supramolecular Photochemistry and photophysics. Adducts of Pt(bpy)(NH3)2(2+) with Aromatic Crown Ethers
We report results of an investigation concerning spectra, emission spectra, luminescence lifetimes, electrochemical properties, and photochemical behavior of Pt(bpy)(NH3)2(2+) (bpy = 2,2′-bipyridine) and its adducts with the following crown ethers in CH2Cl2 and CH3CN solution: 18-crown-6 (18C6), dibenzo-18-crown-6 (DB18C6), dibenzo-24-crown-8 (DB24C8), dibenzo-30-crown-10 (DB30C10), dibenzo-36-crown-12 (DB36C12), bis(m-phenylene)-32-crown-10 (BMP32C10), bis(p-phenylene)-34-crown-10 (BPP34C10), and dinaphtho-30-crown-10 (DN30C10).Adduct formation with the aliphaticcrown ether 18C6 does not change the photochemical and photophysical properties of the Pt(bpy)(NH3)2(2+) complex.By contrast, adduct formation with the aromatic crown ethers causes (i) a strong decrease of the crown ether absorption band and of the ligand (bpy)-centered absorption bands of Pt(bpy)(NH3)2(2+) in the 260-330-nm region, (ii) the appearance of a new broad absorption band in the 340-450-nm region, (iii) the complete or partial quenching of the crown ether fluorescence and of the ligand-centered phosphorescence of Pt(bpy)(NH3)2(2+), (iv) the appearance of a new, broad, and short-lived luminescence band in the 550-630-nm region, (v) the quenching of the photoreaction of Pt(bpy)(NH3)2(2+) in CH2Cl2, and (vi) a perturbation in the electrochemical reduction potentials.These results are attributed to an electronic interaction, in the ground and excited state, between the bpy ligand of the Pt complex and the aromatic ring of the crowns.The intensity of such electronic interaction depends on the size of the crown ring and on the nature and substitution positions of the aromatic rings present in the crown.The results obtainedshow that the assembly of a coordination compound into an appropriate supramolecular structure can protect the compound from photoreaction and can profoundly change its spectroscopic, photophysical, and electrochemical properties.
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Chiral Catalysts,
Chiral catalysts – SlideShare