Table 1 Quantitative comparison of the physical and photophysical properties of HIs 1-4

1a

25.0^a/25.3^a

0.3^a

39:61^a

(60 °C)

1.5 days^a

47% E (590 nm)^a

94% Z (450 nm)^a

477^c; 15,300^c/

518^c; 12,200^c

41^c; 3100^c

1b

31.2^b/31.4^b

0.3^b

42:58^b

(135 °C)

118 years^b

62% E (625 nm)^a

100% Z (470 nm)^a

499^c; 7700^c/

539^c; 7700^c

40^c;

0^c

1c

31.4^b/31.9^b

0.5^b

34:66^b

(135 °C)

199 years^b

63% E (625 nm)^a

100% Z (470 nm)^a

493^c; 9600^c/

534^c; 7600^c

41^c; 2000^c

2a

-^e

-^e

- ^e

-^e

-^e

-^e

-^e

2b

22.9^a/22.5^a

0.4^a

67:33^a

(25 °C)

36 min^a

79% E (625 nm)^a

92% Z (490 nm)^a

518^c; 9600^c/

563^c; 8300^c

45^c; 1300^c

2c

29.2^a /27.9^a

1.3^a

87:13^a

(80 °C)

291 days^a

92% E (660 nm)^a

91% E (625 nm)^g

92% Z (470 nm)^a

81% Z (470 nm)^g

507^c; 6000^c/

562^c; 5100^c

55^c; 900^c

3a

-^{b, f}

0.1^{b, f}

47:53^b

(0 °C)

-^{b, f}

50% E (530 nm)^a

53% Z (450 nm)^a

477^c; 5900^c/

523^c; 4700^c

46^c; 1200^c

3b

27.4^a/27.5^a

0.1^a

46:55^a

(80 °C)

74 days^a

62% E (590 nm)^a

92% Z (470 nm)^a

512^c; 9700^c/

542^c; 9000^c

30^c; 700^c

3c

24.5^a/24.6^a

0.1^a

48:52^a

(60 °C)

14 h^a

46% E (550 nm)^a

72% Z (470 nm)^a

503^c; 8800^c/

541^c;7300^c

38^c; 1500^c

4a

-^{a, e}

-^{a, e}

-^{a, e}

-^{a, e}

-^{a, e}

-^{c, e}

-^{c, e}

4b

26.5^a/27.4^a

0.8^a

23:77^a

(80 °C)

27 days^a

89% E (505 nm)^a

81% E (505 nm)^g

87% Z (660 nm)^a

88% Z (625 nm)^g

561^c; 6500^c/

517^c; 7100^c

44^c; 600^c

4c

26.8^a/27.5^a

0.7^a

26:74^a

(80 °C)

40 days^a

90% E (490 nm)^a

90% E (490 nm)^g

93% Z (660 nm)^a

88% Z (625 nm)^g

560^c; 3600^c/

507^c; 4100^c

53^c; 500^c