One-dimensional lead iodide hybrid stabilized by inorganic hexarhenium cluster cations as a new broad-band emitter

A novel one-dimensional (1D) hybrid {[Re(6)S(8)(PzH)(6)][Pb(3)I(8)(DMF)(2)]}·6(DMF) with hexarhenium cluster cations has been synthesized and characterized by means of single-crystal X-ray diffraction. Two DMF oxygen atoms bridge three lead iodides to form a set of lead iodides, {[PbI(4/2)I(O(DMF))(1/2)][PbI(4/2)(O(DMF))(2/2)][PbI(4/2)I(O(DMF))(1/2)]}(2−), and these sets of lead iodide share edges to form a 1D lead iodide chain, [Pb(3)I(8)(DMF)(2)](2−) which has never been reported before and is different from the typical edge sharing of octahedral PbI(6) units. 1D lead iodide chains are stacked along the a axis, and [Re(6)S(8)(PzH)(6)](2+) cations with H-bonded DMF molecules to pyrazole N–H reside between 1D lead iodide chains. This 1D lead iodide hybrid shows strong broad-band emission with a peak at 634 nm. The excellent photoluminescent properties of the new lead iodide hybrid exhibit great potential for optoelectronic applications in photonic devices with broad-band emission and stability. This study introduces a new class of lead iodide hybrid compounds having new inorganic cluster cations rather than the organic amine cations that have been used in numerous studies to date. This work opens a promising path to overcome the instability of perovskites including of organic amine cations.