Anion binding with some 22- and 28-membered selenaaza macrocycles: structural aspects and 77Se NMR studies

Panda, Snigdha ; Zade, Sanjio S. ; Panda, Arunashree ; Singh, Harkesh B. ; Butcher, Ray J. (2006) Anion binding with some 22- and 28-membered selenaaza macrocycles: structural aspects and 77Se NMR studies Journal of Organometallic Chemistry, 691 (12). pp. 2793-2809. ISSN 0022-328X

Full text not available from this repository.

Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.jorganchem.2006.02.016

Abstract

A series of macrocyclic adducts of the 22- and 28-membered selenaaza macrocycles (1 and 2, respectively) with different counter anions such as halides, sulfate, perchlorate, phosphate, trifluoroacetate and nitrate has been prepared. The adducts have been characterized by elemental analysis, IR, 1H NMR, 77Se NMR and ESI-MS analysis. The 77Se NMR spectrum of the SO2−4 adduct (7) shows an upfield shift compared to the parent macrocycle. The bromo (5), iodo (6), sulfate (7), trifluroacetate (10) adducts of the 22-membered selenaaza macrocycle and perchlorate (16), trifluroacetate (18) adducts of the 28-membered selenaaza macrocycle have been structurally characterized. The crystal structures show extensive hydrogen bonding networks. The molecular structures of all the compounds show the macrocycle to be fully protonated except the trifluroacetate adduct of the 22-membered macrocycle (10), which is only diprotonated. The binding constants of the neutral 22-membered selenaaza macrocycle towards, fluoride, bromide, iodide and sulfate ion have been determined by the NMR titration method.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Selenaaza Macrocycles; 77Se NMR; Anion Binding; EQNMR; Hydrogen Bonding
ID Code:47584
Deposited On:11 Jul 2011 13:45
Last Modified:13 Jul 2011 04:35

Repository Staff Only: item control page