Bis-heteroleptic Ru(ii) polypyridine complex-based luminescent probes for nerve agent simulant and organophosphate pesticide

Two bis-heteroleptic Ru(ii) complexes of a 4,7-dihydroxy-1,10-phenanthroline ligand were synthesized for the detection of the nerve agent gas mimic, DCP, and the organophosphate pesticide, dichlorvos, through the “off–on” luminescence response.

fac-Triaqua(1,10-phenanthroline-κ2 N,N′)(sulfato-κO)cobalt(II): crystal structure, Hirshfeld surface analysis and computational study

The CoII atom in the title complex, [Co(SO4)(C12H8N2)(H2O)3] (or C12H14CoN2O7S), is octahedrally coordinated within a cis-N2O4 donor set defined by the chelating N-donors of the 1,10-phenanthroline ligand, sulfate-O and three aqua-O atoms, the latter occupying an octahedral face. In the crystal, supramolecular layers lying parallel to (110) are sustained by aqua-O—H...O(sulfate) hydrogen bonding. The layers stack along the c-axis direction with the closest directional interaction between them being a weak phenanthroline-C—H...O(sulfate) contact. There are four significant types of contact contributing to the calculated Hirshfeld surface: at 44.5%, the major contribution comes from O—H...O contacts followed by H...H (28.6%), H...C/C...H (19.5%) and C...C (5.7%) contacts. The dominance of the electrostatic potential force in the molecular packing is also evident in the calculated energy frameworks. The title complex is isostructural with its manganese, zinc and cadmium containing analogues and isomeric with its mer-triaqua analogue.