The DOI matches its Crossref record; 11 of the 11 references it cites were found in a registry or an index.
Synthesis, Crystal Structure, and Optical and Thermal Properties of (C4H9NH3)2MI4 (M = Ge, Sn, Pb)
Abstract
Single crystals of the organic-inorganic layered perovskites (C 4 H 9 NH 3 ) 2 MI 4 (M = Ge, Sn, Pb) have been grown from aqueous hydriodic acid solutions. X-ray diffraction, thermal analysis, and photoluminescence spectroscopy were used to compare crystal structure, metal atom lone-pair stereoactivity, and physical properties as a function of group IVB element. The orthorhombic (C 4 H 9 NH 3 ) 2 GeI 4 structure, refined in the space group Pcmn, consists of single-layer-thick perovskite sheets of distorted corner-sharing GeI 6 octahedra separated by n -butylammonium cation bilayers. (C 4 H 9 NH 3 ) 2 SnI 4 and (C 4 H 9 NH 3 ) 2 PbI 4 are structurally very similar but adopt the space group Pbca, with a more ideal octahedral iodine coordination around the divalent group IVB atoms. Within the more general tin(II)-based family, (C 4 H 9 NH 3 ) 2 (CH 3 NH 3 ) n -1 Sn n I 3 n +1, a structural comparison between the title semiconducting n = 1 compound and the previously reported semimetallic n = 3 and metallic n → ∞ members demonstrates a correlation between perovskite sheet thickness, Sn(II) lone-pair stereochemical activity, average Sn−I bond length, and electrical conductivity within this series. While (C 4 H 9 NH 3 ) 2 GeI 4 melts at 222(2) °C, significantly below its bulk decomposition temperature, (C 4 H 9 NH 3 ) 2 SnI 4 ( T m = 256(2) °C) and (C 4 H 9 NH 3 ) 2 PbI 4 ( T m = 285(4) °C) melt/decompose at progressively higher temperatures and are less stable as a melt. Room-temperature photoluminescence from the title compounds exhibits a pronounced spectral peak in the visible range, with the peak wavelength varying between 690(5), 625(1), and 525(1) nm for the M = Ge, Sn, and Pb compounds, respectively.
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Citations
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Metadata
- Authors
- Mitzi, D. B.
- Venue
- Chemistry of Materials
- Publisher
- American Chemical Society (ACS)
- Published
- 1996-01-01
- Volume
- 8
- Issue
- 3
- Pages
- 791-800
- ISSN
- 0897-4756 (ISSN-L)
- 1520-5002
- OpenAlex
- W2035982983
- Cited by
- 561
- References
- 11
- FWCI
- 6.31
- Type
- journal article
- Language
- en
- Open access
- closed
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