期刊
CHEMISTRY OF MATERIALS
卷 34, 期 1, 页码 288-296出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.1c03492
关键词
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资金
- Department of Science and Technology (Swarnajayanti Fellowship), India [DST/SJF/CSA-01/2019-20]
- Science & Engineering Research Board (Swarnajayanti Fellowship), India [SB/SJF/2020-21/02]
- University Grants Commission (UGC), India
The study of two-dimensional layered hybrid perovskites reveals that the new iodine-iodine interaction and hydrogen bonding can influence the crystal structure and optical properties. The symmetry of hydrogen bonding has a significant impact on band gap and bond angles.
Two-dimensional layered hybrid perovskites like (H-(CH2)(6)-NH3)(2)PbI4 have hydrogen bonding interactions between organic and inorganic sublattices, influencing structure and properties. When a halogenated organic cation is used forming layered perovskites like (I-(CH2)(6)-NH3)(2)PbI4, a new noncovalent interaction between the iodine tail of the organic cation and iodine of the Pb-I inorganic sublattice is introduced. How does the new iodine-iodine interaction, in conjunction with hydrogen bonds, modulate the crystal structure and optical properties of layered hybrid perovskites? Here we address this question providing new insights and functionality. We prepared single crystals of (I-(CH2)(n)-NH3)(2)PbI4 (n = 2-6) and measured single-crystal X-ray diffraction and photoluminescence at different temperatures. All the samples (n = 2-6) do not show a temperature-dependent phase transition in the range of 10 to 296 K (approximately room temperature), in contrast to samples containing nonhalogenated organic cations. Then we introduce a structural parameter (r) indicating symmetry of hydrogen bonding (-NH3 group) with respect to the inorganic sublattice. Lower values of r indicate more symmetry in hydrogen bonding, leading to a higher Pb-I-Pb bond angle and lower band gap for n = 5-6. Higher r increases asymmetry in hydrogen bonding, decreasing the band gap for n = 2-4.
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