14
M. Matsui
1.44
N
R
1
H 3 C
CH 3
N
H 3 C
CH 3
R
2
S
S
S
S
Ni
R
3
R
4
R
1
R
2
X
1.45
S
S
S
S
M
1.47
RO 2 S
SO 2 R
O
O
O
O
O
O
O
O
N
N
OH
HO
R
2
R
2
1.52
R
1
R
1
R
1
R
1
1.48
N
R
1
H 3 C
CH 3
N
H 3 C
CH 3
R
2
X
1.49
N
R
1
H 3 C
CH 3
N
H 3 C
CH 3
R
2
X
1.50
N
S
R
1
N
H 3 C
CH 3
R
2
X
Y
Z
1.51
N
R
1
H 3 C
CH 3
N
H 3 C
CH 3
R
2
SO 3
O
O
O
O
O
CN
NC
NC
CN
SO 3
1/2
N
R
1
H 3 C
CH 3
N
H 3 C
CH 3
R
2
S
S
S
S
Cu
1.46
R
4
R
3
Fig. 1.8 Data recording polymethine dyes