Synthesis and crystal structures of lanthanide complexes with foliage growth regulator: phenoxyalkanoic acid

Syntheses, Structures and Luminescence Properties of Two-Dimensional Supramolecular Complexes Containing a Flexible Carboxylate Ligand

Two new complexes, [Cd(L)2(bipy)0.5(H2O)] and [Zn(L)2(bipy)] (HL=3-(2-hydroxyphenyl)propanoic acid and bipy=4,4'-bipyridine) have been synthesised and structurally characterised by single-crystal diffraction analysis. Although both complexes have a one-dimensional network, the resulting supramolecular architectures are different. Their three-dimensional fluorescence spectra are reported.

2,4-Dichlorophenoxyacetic Acid Derived Schiff Base and Its Lanthanide(III) Complexes: Synthesis, Characterization, Spectroscopic Studies, and Plant Growth Activity

2,4-Dichlorophenoxyacetic acid derived Schiff base (HL) and its lanthanide [La(III), Pr(III), Nd(III), Sm(III), Eu(III), Gd(III), Dy(III), Y(III)] complexes were synthesized and characterized by various spectroscopic (1H,13C, DEPT and 2D HMQC NMR, FT-IR, UV-Vis, and mass) techniques and other analytical methods. HL exhibits “E” and “Z” isomerism and was confirmed by variable temperature1H NMR studies. The spectral and analytical data reveals the bidentate coordination of HL to lanthanide(III) ion, through carboxylic acid group via deprotonation. Fluorescence spectrum of europium complex shows bands at 578, 592, and 612 nm assignable toD05→F07,D05→F17, andD05→F27, respectively. Auxin activity of HL and lanthanum(III) complex on wheat seeds (Triticum durum) was measured at different concentrations. The percentage germination, root length, and shoot length were recorded. An enhancement in the plant growth activity of the ligand was observed on complexation and the best activity was observed at 10−6 M concentration.