Biomedical Engineering Reference
In-Depth Information
63a
R =
O
63f
63b
R
N
N
R
63g
63c
O
N
63d
63h
R
O
O
C
40
H
81
O
63i
63
63e
O
Figure 9.25
Sot ionic crystals based on trialkyltriazatriangulenium.
OC
n
H
2n+1
H
2n+1
C
n
O
BF
4
OC
n
H
2n+1
O
OC
n
H
2n+1
H
2n+1
C
n
O
OC
n
H
2n+1
64a
: n = 8, Cr 25 Col
h
200 dec
64b
: n = 12, Cr 40 Col
h
200 dec
Figure 9.26
Ionic complex based on 2,4,6-triarylpyrylium tetral uoroborates.
9.3.1.13 2,4,6-Triarylpyrylium Tetral uoroborates
Veber and coworkers [97] described the synthesis and mesomorphic behavior
of salts (Figure 9.26) of 2,4,6-triarylpyrylium
64a
and
64b
. h ese compounds
were prepared from catechol. h ese were found to exhibit ordered Col
h
phase
from room temperature to up to 200 C, at er which they decompose.
9.3.2 Ionic Metallomesogens
Camerel
et al.
[98] prepared a series of Cu complexes with 1,10-phenanth-
rolines and single-tail as well as double-tail surfactants. Two kinds of phen-
anthrolinedisulfonate ligands, namely bathophenanthrolinedisulfonic acid
(BPS) and bathocuproinedisulfonic acid (BCS), have been used for com-
plexation with Cu(II)Cl
2
. With BPS and surfactant, green colored Cu(II)
complex with trigonal bipyramidal geometry was obtained, while with BCS
and surfactant, red colored Cu(I) complex with tetrahedral geometry was
obtained. Out of sixteen complexes, only two complexes,
65a
and
65b,
with
double-tailed C18 chain surfactant were liquid crystalline (Figure 9.27).
