Thiophene-phenylquinazoline probe for selective ratiometric fluorescence and visual detection of Fe(iii) and turn-off fluorescence for I and its applications.

A 2,5-bis(4-phenylquinazolin-2-yl)thiophene (BQT) probe is designed, synthesized and explored for selective ratiometric fluorescence and visual detection of Fe and as a turn-off fluorescence probe for I anion. BQT is colorless and has blue emission in CHCN solution. BQT selectively complexes with Fe, turns its solution from colorless to greenish yellow and enables the ratiometric sensing of Fe with limit of detection (LOD) and limit of quantitation (LOQ) of 2 × 10 M and 6.

Fixing Transient Iodine on Developed Latent Fingermarks.

In the present study, a simple and novel fume-mist technique is described which can be used efficiently to fix the latent fingermarks developed using iodine. It is well known that the residues left over in the fingermarks interact with iodine to give transient brown impressions which disappear in a short time. Also, iodine forms colored complexes with various organic solvents.

A pyrene formulation for fluorometric visualization of latent fingermarks.

Present work is conducted to demonstrate the use of pyrene for the development of latent fingermarks. Pyrene formulation with binders can be efficiently used for developing latent fingermarks on porous, non-porous and semi-porous surfaces. The effectiveness of pyrene formulation for the detection of latent fingermarks present on a large variety of objects was systematically and comparatively carried out.