Two dinuclear mercury(II) iodide complexes of the types [(L1)Hg(µ-I)HgI 3 ] (1) and [Hg 2 (L2) (I) 4 ]•H 2 O (2) [L1 = tris(2-aminoethyl)amine and L2 = N,N-(bis-(pyridin-2-yl)benzylidene)diethylenetriamine] have been synthesized and characterized using microanalytical, 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 HgI 4 chromophore surrounded by four iodides, while the other has a distorted trigonal bipyramidal environment with an HgN 4 I 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 HgN 3 I 2 chromophore in a distorted square pyramidal geometry and Hg2 with an HgN 2 I 2 chromophore in a tetrahedral environment. Weak intermolecular N-H•••I hydrogen bonds in 1 and cooperative C-H•••π and π •••π interactions in 2 promote dimensionalities. The Schiff base complex, 2, shows intraligand (π-π*) fluorescence in DMF solution at room temperature, whereas compound 1 containing tripodal amine is fluorescent-inactive.