Synthesis, optical, electronic and magnetic studies of air-stable chiral Cu( ii ) chlorides †

Azmy, Ali and Mudiyanselage, Nivarthana W. Y. A. Y. and Nassar, Kamal E. S. and Pham, Mike and Zibouche, Nourdine and Phan, Manh-Huong and Spanopoulos, Ioannis (2024) Synthesis, optical, electronic and magnetic studies of air-stable chiral Cu( ii ) chlorides †. Journal of Materials Chemistry A, 12 (38). pp. 25730-25739. ISSN 2050-7488

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Abstract

Chiral magnetic metal halide semiconductors (MHSs) have recently emerged as a unique platform of hybrid materials for state-of-the-art applications, where both chiroptical and magnetic properties are essential. Motivated by the scarcity of MHS compounds that feature the latter traits and the absence of relevant structure–property relationships, we present here the synthesis and the optical, electronic, and magnetic properties of two new polar 0D, Cu(ii) based materials, namely (S-/R-THBTD)2CuCl6, where THBTD = 4,5,6,7-tetrahydro-benzothiazole-2,6-diamine. Both enantiomers exhibit direct and indirect optical bandgap characteristics based on UV-vis and density functional theory (DFT) calculations, while circular dichroism (CD) measurements confirmed their chiral character. Magnetometry measurements revealed a notable transition from a paramagnetic to a ferromagnetic-like state at around 4 K, with a low-temperature saturation magnetization value of up to 9.86 emu g−1, which is among the highest reported for chiral magnetic MHSs. Notably, (S-/R-THBTD)2CuCl6 maintain their structural integrity and magnetic and optical properties (based on UV-vis studies) after one year of air exposure, a record stability performance among chiral magnetic MHSs. This work proves that air-stable MHSs with competitive chiroptical and magnetic properties can be acquired by properly selecting suitable templating agents, paving the way for further materials development.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Materials Chemistry A
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2100/2105
Subjects:
?? renewable energy, sustainability and the environmentmaterials science(all)chemistry(all) ??
ID Code:
224236
Deposited By:
Deposited On:
24 Sep 2024 11:05
Refereed?:
Yes
Published?:
Published
Last Modified:
09 Oct 2024 14:05