One-pot synthesis using a 2:2:1:2 molar ratio of Pb(OAc)₂·3H₂O, L, piperidinum terephthalate (ptp) and NaClO₄/NH₄PF₆ at room temperature affords two dinuclear compounds of the type [Pb₂(L)₂(𝜇- tp)](ClO₄/PF₆)₂ (1/2) [L=N,N'-(bis-(pyridin-2-yl)benzylidene)diethylenetriamine and tp = terephthalate dianion]. The compounds are characterized by microanalytical, spectroscopic, thermal and other physicochemical results. X-ray structural analyses of 1 and 2 reveal that each heptacoordinated lead(II) centre with a PbN₅O₂ chromophore are bound by five N atoms of L and connected through O atoms of a bis(bidentate) tp bridge. The arrangements of L and tp suggest a gap around the metal centre due to occupation of a stereo-active lone pair of electrons reflecting a hemidirected coordination around the metal centre. The complexes exhibit reasonable thermal stabilities with the tolerate temperatures ca. 255°C for 1 and 263°C for 2. The complexes display intraligand ($\pi-\pi^\ast$) fluorescence in the solid state and in DMF solutions at room temperature.

Two dinuclear mercury(II) iodide complexes of the types [(L1)Hg(𝜇-I)HgI₃] (1) and [Hg₂(L2) (I)₄]·H₂O (2) [L1 = tris(2-aminoethyl)amine and L2 = N,N'-(bis-(pyridin-2-yl)benzylidene)diethylenetriamine] have been synthesized and characterized usingmicroanalytical, spectroscopic, thermal and other physicochemical results. Structures of both the compounds are solved by X-ray diffraction measurements. Structural analyses show that one mercury (II) centre in 1 adopts a distorted tetrahedral geometry with an HgI₄ chromophore surrounded by four iodides, while the other has a distorted trigonal bipyramidal environment with an HgN₄I chromophore bound by four N atoms of L1 and one bridging iodide. Pentadentate Schiff base (L2) in 2 shows unusual binucleating bis(bidentate) behaviour to bind two different mercury(II) centres—Hg1 with an HgN₃I₂ chromophore in a distorted square pyramidal geometry and Hg2 with an HgN₂I₂ chromophore in a tetrahedral environment. Weak intermolecularN-H…I hydrogen bonds in 1 and cooperative C-H$\ldots$𝜋 and $\pi\ldots \pi$ interactions in 2 promote dimensionalities. The Schiff base complex, 2, shows intraligand ($\pi-\pi^\ast$) fluorescence in DMF solution at room temperature, whereas compound 1 containing tripodal amine is fluorescent-inactive.