This characteristic band is due to asymmetric stretching in carboxylate anion
that is reconfirmed by another peak at 1422 cm 1 which is related to the symmetric stretching mode of the carboxylate anion
A displacement is also observed in the asymmetric vibration band of the carboxylate anion
1] is due to C=O asymmetric stretching in carboxylate anion
that is reconfirmed by another peak at 1411 [cm.
The carboxylate anion
has two strongly coupled carbon-to-oxygen bonds that give rise to the separately asymmetric and symmetric stretching vibration.
Selected ion monitoring was performed to monitor the carboxylate anion
(M-181; loss of [sup.
The intense characteristic band at 1573 cm-1 is due to C=O asymmetric stretching in carboxylate anion
that is reconfirmed by another sharp peak at 1416 cm-1 which is related to the symmetric stretching mode of the carboxylate anion
Following formation of the carboxylate anion
, decarboxylation would generate the fragment ion detected at m/z 275.
The catalyst 2MI initiates the ring-opening reaction of the epoxy group of pDGEBA to form an oxygen anion, which subsequently picks up hydrogen from carboxyl in DACA to yield a carboxylate anion
[reaction (1) of Scheme 2].
2) of AHAMAA shows evidence of the coordination between the carboxylate anion
and aluminum ion at the strong absorption peak of 1658 [cm.
Complexation occurs between the lanthanide metal cation and the carboxylate anion
in the methacrylic segments of the random copolymer via ionic interactions.
For the L-1, L-2 and L-3 (Cu(II), Pd(II) and Pt(II)) complexes, the separation value (I) between asymmetric and symmetric stretching vibrations, greater than 200 cm-1 may be expected for the monodentate bonding carboxylate anions
These results showed that a highly expanded network can be generated by electrostatic repulsions among carboxylate anions
(-COO') during the polymerization process.