Table 2 Comparison of described Cu2+ and Co2+ sensors with NIC.

From: Protan triggered colorimetric and fluorometric responsive coumarin coupled imidazole as Co2+ sensor, DFT and zebrafish bioimaging studies

Serial no

Sensor type

Media

LOD

References

1

Turn on (Co2+)

DMSO

100 × 10− 6

24

2

Colorimetric

(Co2+)

THF

734 × 10− 6

44

3

Turn off (Co2+)

Bis-tris buffer

0.65 × 10− 3

15

4

Turn off (Co2+)

DMSO/ Bis-tris buffer

0.19 × 10− 3

45

5

Turn off (Co2+)

Acetonitrile: water (8:2, v/v)

7.0 × 10− 6

Present work

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