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Structural Tunability and Diversity of Two‐Dimensional Lead Halide Benzenethiolate
Author(s) -
Coffey Aidan H.,
Yoo Pilsun,
Kim Dong Hee,
Zeller Matthias,
Avetian Sona,
Huang Libai,
Liao Peilin,
Dou Letian
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201905790
Subject(s) - halide , lone pair , band gap , chemistry , photoluminescence , lattice (music) , crystallography , optoelectronics , materials science , molecule , inorganic chemistry , physics , organic chemistry , acoustics
Two‐dimensional (2D) organic‐inorganic hybrid materials are currently of great interest for applications in electronics and optoelectronics. Here, the synthesis and optical properties of a new type of halide‐organothiolate‐mixed 2D hybrid material, Pb 2 X(S‐C 6 H 5 ) 3 , are reported, in which X is a halide (I, Br, or Cl). Different from conventional lead‐based 2D layered materials, these compounds feature unusual five‐coordinated lead centers with a stereochemically active electron lone pair on the lead atoms and four‐coordinated iodine atoms. The Pb 2 X(S‐C 6 H 5 ) 3 materials feature an indirect bandgap, strongly emissive long‐lived self‐trap states, and an extremely large Stokes shift. Interestingly, the optical bandgap of the materials can be tuned through variation of the halides; however, the photoluminescence is less sensitive to the composition and is more likely dominated by lead‐sulfur lattice interactions or the lead lone‐pair electrons. Our results support that a halide–organothiolate mixed anion hybrid structure offers a unique platform for discovering new exciting 2D electronic materials.