Moderate to weak - interactions exist between the ligands of all complexes. Complex 1, weak - interactions (centroid to centroid) of 3.815 Å and 3.868 Å exist between the phenyl rings of the phenanthroline part and pyrazine rings respectively along with the strong interaction of 3.324(2) Å between the C16A=C15A•••C17A=C18A (Figure ). While in the case of 2, similar weak interaction of 3.752 Å exist between the centroid of the phenyl and pyrazine ring along with a stronger ••• interaction of 3.276(2) Å between the C16A=C15A•••C17A=C18A. Surprisingly, in the case of 3, comparatively stronger ••• interactions are present between the ligands with the distance of 3.552, 3.697 and 3.810 Å between the centroid of the pyrazine, thiophene and phenanthroline rings (Figure ). Additionally, weak n- interaction is present at a distance of 3.489 (6) Å between the free lone pair of electrons of S1A and C1=C2 along with that stronger lp(S2A)•••lp(S2A) interactions at a distance of 3.171(8) Å (Figure ). Additionally, the PXRD data for the crystalline complexes were collected to analyze the purity of each batch of complexes that were obtained through the reaction carried through the conventional synthesis (Figure -S23).