A colloidal wet-chemistry was employed to prepare covalent organometallic polyhedron (COPs). A complex between metal cation (Mn+) and multi-coordinate ligands (M-COPs) was found to be formed with a coupling of hydrophilic active sizes into the substructure. These substructures are highly stable, enabling the COPs to be stable in air and water, enhancing print residue detection and selectivity, due to various carboxylates that can interact with amino acids in fingerprint residues. The interaction between prints and M-COPs was found to occur within 5-30 s, enabling the rapid detection of fingerprints from non-porous and porous surfaces. The sensitivity and visibility of latent prints were used to increase by impregnating fluorescent dye into COP’s pore by a post-modification. This technique allows for encapsulation of M-COPs by dyes to emit different colors when ‘hemiketalized’ with the amino acid in fingerprint residue. Fig. 1 lists the ligands, dyes and metal ions, which have been used to produce COP DAs to improve sensitivity, selectivity and detection speed. This study indicated that the microwave-assisted colloidal chemistry was optimal method in the producing of well-crystallized COPs. The charge attraction developed during microwave radiation is the driving force for the nucleation, leading to the crystallization and growth. The fluorescent COFs (3 formulations) with highly porous nanostructures (Fig. 2) were generated in a short period under microwave radiation. Functional groups of –NH2 and -C=O can be introduced into the COP pores. These groups were found react with 1° and 2° amines in amino acids present in the papillary exudate forming hemiketals. The fluorescent emission yield can be used as a quantitative evaluation of the fingerprints detection thresholds.

Nanostructured covalent organometallic polyhedron (COP) agents used to detect fingerprints from the non-porous surfaces

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.