Heteroleptic Zn(II) Complexes: Synthesis, Characterization and Photoluminescence Properties

Selective Pathway toward Heteroleptic Spin-Crossover Iron(II) Complexes with Pyridine-Based N-Donor Ligands

“…A ligand substitution is often the method of choice; , however, it is not the best one for the weak-field 3-bpp ligands . For them, a more viable option is a stepwise introduction of the ligands into the coordination sphere of the metal ion that can be carried out “one-pot” , or with the isolation of an intermediate pentacoordinate iron­(II) product . To adapt it to the heteroleptic complexes of 3-bpp, we substituted acetylacetonate or chloride ligands − by triflate anions and avoided using trifluoromethanesulfonic acid that causes destruction of the intermediate product due to the weak-field nature of 3-bpp …”

“…This approach accommodates a wider scope of substrates than the simple mixing of ligands and a metal salt often used for this purpose − ,− ,, or the ligand substitution . As compared to other synthetic pathways, − the stepwise introduction of the ligands proceeds selectively because of a good solubility of the intermediate pentacoordinate complex with the triflate ligands; the latter does not have to be isolated from the reaction. A drawback of the proposed approach is, however, the need for an inert atmosphere to preclude the hydrolyzation of TMSOTf into triflic acid, as it may cause the decomposition of N -donor coordination compounds.…”

“…Although the former is often obtained − ,− ,, by mixing of two ligands and a metal salt followed by purification, this method can only be applied if the heteroleptic complex is the major product, and hence, there is no thermodynamic control of the reaction. Otherwise, another approach is needed that provides the kinetic control, such as the ligand substitution , or a stepwise introduction of the ligands into the coordination sphere of the metal ion through the formation of an intermediate pentacoordinate complex with chloride or acetylacetonate ligands. − Both these approaches are, however, not suitable for 3-bpp as a weak-field ligand that produces low-soluble pentacoordinate complexes …”

Optical Characterization of Quinoline Yellow Fluorochemosensors for Analyzing Its Photonics Applications With Synthesized Nano Particles

“…Quinoline derivatives are found to have exceptional mechanical properties, which contributes to generation of high e cient materials in transportation of electrons. Characteristics such as good lm formation, high electron mobility, great e ciency for photoluminescence and high thermal stability, makes quinoline derivatives to be of application in OLEDs .So, compounds containing quinoline owes to improved brightness and luminescence e ciencyin organic light emitting diodes [1][2][3][4][5][6][7][8], [18][19][20][21][22][23][24][25][26].…”