A novel tetranuclear cubic cage, [Tl4(μ3-dcp)4] {Hdcp=2,4-dichlorophenol}, new short Cl⋯Cl interactions, thermal, fluorescence, structural and solution studies

The single crystal X-ray analysis of a novel TlI complex of 2,4-dichlorophenol (Hdcp) ligand shows that the complex has a tetranuclear cubic cage as a result of bridging ligands dcp− with basic repeating of [Tl(μ3-dcp)] units. There are four thallium atoms with similar coordination spheres in the cubic cage. These thallium atoms contain irregular coordination sphere with stereo-chemically active lone pair. The thermal stability of [Tl4(μ3-dcp)4] was studied by thermal gravimetric (TG) and differential thermal analyses (DTA). The compound [Tl4(μ3-dcp)4] is luminescent in the solution state with emission maxima at 397 nm. The results of studies of the stoichiometry and formation of [Tl4(μ3-dcp)4] complex in DMF solution were found to be in support of their solid state stoichiometry.