Lanthanide Compounds with SCHIFF Bases and with Copper(II) SCHIFF Base Complexes as Ligands

Abstract

Lanthanide adducts with N,N′‐bis(salicylidene)‐1,3‐propylendiamine and N,N′‐bis(salicylidene)‐1,3‐propylendiamine‐2‐olo have been prepared. It is noted that the molecules, and not anions, of the SCHIFF bases are coordinated with the metal ion. Bi‐ and trinuclear lanthanide complexes with the “complex ligand”, N,N′‐1,3‐propylen‐bis‐(salicylideniminato)copper(II), coordinating as a bidentate ligand, have also been isolated. The compounds have been characterized by elemental analyses, molar conductance, electronic and infrared spectra. Possible structures for the complexes have been proposed.

A catalytic process for the selective oxidation of alcohols by copper (II) complexes

“…A strong band, typical of ν(C=N) stretching, is found in the 1596-1625 cm −1 range in the spectra of the complexes [22,23]. The observed shift in the ν(C=N) stretch after complexation confirms the formation of a coordinate bond from the imine nitrogen to the metal ion [23][24][25]. The band in the region 1315-1330 cm −1 which is assigned to phenolic ν(C-O) in the free ligand, is shifted to higher wave number in the complexes suggesting the coordination of phenolic oxygen to metal ion [26][27][28].…”

Synthesis, characterization and thermal decomposition of copper(II), nickel(II) and cobalt(II) complexes of 3-amino-5-methylpyrazole Schiff-bases

“…A strong band, typical of C@N stretching, is found in the 1596-1625 cm )1 range in the spectra of the complexes [14,16]. The observed shift in the C@N stretch after complexation confirms the formation of a coordinate bond from the imine nitrogen to the metal ion [16,19,20]. The absorption bands within the pyrazole ring appear in the 1570-1425 cm )1 range in the spectra of the complexes [21].…”

Synthesis, structural and spectroscopic properties of a new Schiff base ligand N,N′-bis(trifluoromethylbenzylidene)ethylenediamine

“…The infrared spectrum of 1 shows a sharp peak at 1640 cm À1 which is typical of the conjugated C N stretching [35][36][37][38][39].…”