Table 1.

Comparison of melting points of duplexes containing a PG group (the name contains an asterisk) with the analogous duplexes without a PG group at the same positions. ΔT_m is the difference between the average melting points of the examined and comparison duplexes. The asterisk (*) means the PG-modified chain.

Row	Examined Duplex	Comparison Duplex	ΔTm, °C
1	As:S-OMe*	As:S-OMe	−1.4
2	As:S-F*	As:S-F	−1.1
3	As-OMe:S-OMe*	As-OMe:S-OMe	−1.4
4	As-OMe:S-F*	As-OMe:S-F	−1.4
5	As-OMe*:S-OMe*	As-OMe*:S-OMe	−1
6	As-OMe*:S-F*	As-OMe*:S-F	−1.7
7	As-F:S-OMe*	As-F:S-OMe	−0.4
8	As-F:S-F*	As-F:S-F	−0.9
9	As-F*:S-OMe*	As-F*:S-OMe	−0.6
10	As-F*:S-F*	As-F*:S-F	−0.9
11	As-OMe*:S	As-OMe:S	0
12	As-F*:S	As-F:S	−0.9
13	As-OMe*:S-OMe	As-OMe:S-OMe	−0.3
14	As-F*:S-OMe	As-F:S-OMe	−1.3
15	As-OMe*:S-OMe*	As-OMe:S-OMe*	0.1
16	As-F*:S-OMe*	As-F:S-OMe*	−1.5
17	As-OMe*:S-F	As-OMe:S-F	0.4
18	As-F*:S-F	As-F:S-F	−0.3
19	As-OMe*:S-F*	As-OMe:S-F*	0.1
20	As-F*:S-F*	As-F:S-F*	−0.3