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Synthesis, structure, spectral and electrochemical properties of B(OR)(2)-smaragdyrin complexes

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Title Synthesis, structure, spectral and electrochemical properties of B(OR)(2)-smaragdyrin complexes
 
Creator KALITA, H
LEE, WZ
RAVIKANTH, M
 
Subject NONLINEAR-OPTICAL PROPERTIES
EXPANDED PORPHYRIN
SMARAGDYRINS
ANION
 
Description A series of B(OR)(2)-smaragdyrin complexes were synthesized by treating BF2-smaragdyrin complex with various aliphatic and aromatic alcohols in the presence of AlCl3 in CH2Cl2 at room temperature. The compounds are stable and characterized by various spectroscopic and electrochemical techniques. The X-ray structure solved for one of the B(OR)(2)-smaragdyrin complex showed that the macrocycle is planar and the boron atom is in tetrahedral geometry coordinated to two pyrrole nitrogens of the macrocycle and two oxygen atoms of the axial -OR groups. H-1 NMR studies indicated that the alkoxy or aryloxy groups present on the boron atom experience the macrocyclic ring current effect and appear in the up-field region. The absorption properties of B(OR)(2)-smaragdyrin complexes showed a strong absorption band at similar to 700 nm along with other absorption bands in the 450-650 nm region like BF2-smaragdyrin complex. Since B(OR)(2)-smaragdyrin complexes are electron rich due to the presence of electron rich alkoxy and aryloxy groups, the B(OR)(2)-smaragdyrin complexes are easier to oxidize but difficult to reduce compared to BF2-smaragdyrin. The B(OR)(2)-smaragdyrin complexes are found to be weakly fluorescent than BF2-smaragdyrin.
 
Publisher ROYAL SOC CHEMISTRY
 
Date 2014-10-16T07:06:42Z
2014-10-16T07:06:42Z
2013
 
Type Article
 
Identifier DALTON TRANSACTIONS, 42(40)14537-14544
http://dx.doi.org/10.1039/c3dt51539g
http://dspace.library.iitb.ac.in/jspui/handle/100/15510
 
Language en