Panda Debendra Prasad, Swain Diptikanta, Raghunathan Rajamani, Sundaresan A
School of Advanced Materials, and Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India.
Institute of Chemical Technology-IndianOil Odisha Campus, Bhubaneswar 751013, India.
J Phys Chem Lett. 2023 Oct 26;14(42):9531-9538. doi: 10.1021/acs.jpclett.3c02252. Epub 2023 Oct 18.
It has been challenging to design multifunctional lead-free organic-inorganic hybrid halides that can exhibit fascinating magnetic and photoluminescence properties since the dimensionality of the compounds has a contrasting impact on them. In this context, our newly synthesized compound (2-bromoethylammonium)MnBr (BEAMBr) crystallizes in the monoclinic 2/ space group with corner-sharing zigzag 1D chains of MnBr distorted octahedra. Intriguingly, it exhibits a long-range antiferromagnetic ordering at low temperature (∼2.5 K) along with a typical low-dimensional broad magnetic susceptibility hump. The magnetic properties modeled by the exact diagonalization approach indicate strong intrachain and weak interchain interactions with = -50.1 K, = -13.0 K, and ' = -1.25 K, respectively, suggesting excellent one-dimensionality. In addition, BEAMBr displays orange-red emission with a photoluminescence quantum yield of 15.2%. Interestingly, electron-phonon coupling was observed in this soft distorted compound with coupling strength = 128.3 meV, confirmed from the analysis of temperature-dependent emission line width broadening and Raman spectra.
设计出能够展现出迷人磁性和光致发光特性的多功能无铅有机-无机杂化卤化物颇具挑战性，因为化合物的维度对这些特性有着相反的影响。在此背景下，我们新合成的化合物（2-溴乙铵）溴化锰（BEAMBr）以单斜2/空间群结晶，具有由MnBr扭曲八面体构成的角共享之字形一维链。有趣的是，它在低温（约2.5 K）下表现出长程反铁磁有序，同时伴有典型的低维宽磁化率峰。通过精确对角化方法模拟的磁性特性表明，链内相互作用强，链间相互作用弱，分别为=-50.1 K、=-13.0 K和'=-1.25 K，表明具有出色的一维性。此外，BEAMBr发出橙红色光，光致发光量子产率为15.2%。有趣的是，在这种软扭曲化合物中观察到了电子-声子耦合，耦合强度=128.3 meV，这从对温度依赖的发射线宽展宽和拉曼光谱的分析中得到证实。
