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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/7270

Title: Anion binding with some 22- and 28-membered selenaaza macrocycles: Structural aspects and Se-77 NMR studies
Authors: PANDA, S
ZADE, SS
PANDA, A
SINGH, HB
BUTCHER, RJ
Keywords: receptor chemistry
schiff-base
se
coordination
spectroscopy
ligand
selectivity
highlights
complexes
nitrate
Issue Date: 2006
Publisher: ELSEVIER SCIENCE SA
Citation: JOURNAL OF ORGANOMETALLIC CHEMISTRY, 691(12), 2793-2809
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, H-1 NMR, Se-77 NMR and ESI-MS analysis. The Se-77 NMR spectrum of the SO42- 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. (c) 2006
URI: http://dx.doi.org/10.1016/j.jorganchem.2006.02.016
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7270
http://hdl.handle.net/10054/7270
ISSN: 0022-328X
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