The preparation of an unsupported tetranuclear cluster with a linear Pt0–TlI–TlI–Pt0 metal chain is described. The complex shows strong red emission in the solid state, having a quantum yield of 73%. Density functional theory (DFT) and time-dependent DFT calculations show that red emission originated from a platinum to thallium–thallium charge-transfer excited state.
![A Highly Efficient Luminescent Pt2Tl2 Chain with a Short TlI–TlI Interaction](https://www.iciq.org/wp-content/uploads/2014/03/A-Highly-Efficient_ic-2013-01890t_0005.gif)