A Zero‐Dimensional Organic Seesaw‐Shaped Tin Bromide with Highly Efficient Strongly Stokes‐Shifted Deep‐Red Emission. Issue 4 (21st December 2017)

• Record Type: Journal Article
• Authors: Zhou, Chenkun; Lin, Haoran; Shi, Hongliang; Tian, Yu; Pak, Chongin; Shatruk, Michael; Zhou, Yan; Djurovich, Peter; Du, Mao‐Hua; Ma, Biwu
• Is Part Of: Angewandte Chemie international edition. Volume 57:Issue 4(2018)
• Page Start: 1021
• Page End: 1024
• Publication Date: 2017-12-21
• Subjects: deep-red emission -- large Stokes shift -- organic–inorganic hybrids -- seesaw structure -- zero-dimensional materials; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201710383
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: The synthesis and characterization is reported of (C9 NH20 )2 SnBr4, a novel organic metal halide hybrid with a zero‐dimensional (0D) structure, in which individual seesaw‐shaped tin (II) bromide anions (SnBr4 2− ) are co‐crystallized with 1‐butyl‐1‐methylpyrrolidinium cations (C9 NH20 + ). Upon photoexcitation, the bulk crystals exhibit a highly efficient broadband deep‐red emission peaked at 695 nm, with a large Stokes shift of 332 nm and a high quantum efficiency of around 46 %. The unique photophysical properties of this hybrid material are attributed to two major factors: 1) the 0D structure allowing the bulk crystals to exhibit the intrinsic properties of individual SnBr4 2− species, and 2) the seesaw structure enabling a pronounced excited state structural deformation as confirmed by density functional theory (DFT) calculations. Abstract : Little red seesaw : A zero‐dimensional organic–inorganic hybrid containing a seesaw‐shaped tin bromide species is reported. It exhibits a highly efficient strongly Stokes‐shifted broadband deep‐red emission, which is a result of excited‐state structural deformation from a seesaw to a flattened tetrahedron structure.