Binding of polyatomic anions with protonated ureido-pyridyl ligands

Marivel, S. ; Arunachalam, M. ; Ghosh, Pradyut (2011) Binding of polyatomic anions with protonated ureido-pyridyl ligands Crystal Growth & Design, 11 (5). pp. 1642-1650. ISSN 1528-7483

Full text not available from this repository.

Official URL:

Related URL:


Two ureido-pyridyl ligands, 1-(4-nitro-phenyl)-3-pyridine-3-ylmethyl-urea (L1) and 1-pentafluorophenyl-3-pyridine-4-yl-urea (L2) were synthesized in good yields, and solid-state anion binding studies of (HL1)+ and (HL2)+ with polyatomic anions such as NO3, AcO, ClO4, SO42−, and SiF62− were carried out in detail. Protonation of the pyridyl nitrogen center of L1 with HNO3, HClO4, and HF in different solvent media yielded crystals of complexes 1 (HL1·NO3), 2 (HL1·ClO4), and 3 (HL1·0.5SiF6) suitable for single crystal X-ray diffraction studies, respectively. Similarly, protonation of L2 with HNO3, CH3COOH, and H2SO4 yielded single crystals of complexes 4 [2(HL2·NO3)·DMF], 5 (HL2·AcO), and 6 [(HL2)2·SO4], respectively. X-ray crystallographic analysis of all these six complexes has been carried out and the details of anion binding with the urea functionality of ureido-pyridyl ligands were investigated. In all the complexes, the pyridyl moiety of the ligands is found to be protonated and the binding of anions are observed at the urea functionality of the ligands through the R22(8) hydrogen bonding motif irrespective of sizes and shapes of anions or the electron withdrawing ability of aryl substitutions (p-nitro phenyl vs pentafluoro phenyl) or the position of the pyridyl nitrogen center (protonation site) of the designed ligands.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:102380
Deposited On:23 Jan 2017 11:41
Last Modified:23 Jan 2017 11:41

Repository Staff Only: item control page