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

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Title Anion binding with some 22- and 28-membered selenaaza macrocycles: Structural aspects and Se-77 NMR studies
 
Creator PANDA, S
ZADE, SS
PANDA, A
SINGH, HB
BUTCHER, RJ
 
Subject receptor chemistry
schiff-base
se
coordination
spectroscopy
ligand
selectivity
highlights
complexes
nitrate
selenaaza macrocycles
se-77 nmr
anion binding
eqnmr
hydrogen bonding
 
Description 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
 
Publisher ELSEVIER SCIENCE SA
 
Date 2011-07-27T16:18:11Z
2011-12-26T12:57:38Z
2011-12-27T05:44:21Z
2011-07-27T16:18:11Z
2011-12-26T12:57:38Z
2011-12-27T05:44:21Z
2006
 
Type Article
 
Identifier JOURNAL OF ORGANOMETALLIC CHEMISTRY, 691(12), 2793-2809
0022-328X
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
 
Language en