Tetrabromobenzene-based molecular alloys – a tool for tailoring the temperature of the thermosalient phase transition

Klaser, Teodoro; Stepančić, Oskar; Popović, Jasminka; Pisk, Jana; Pavić, Luka; Picek, Igor; Matković-Čalogović, Dubravka; Skoko, Željko (2025) Tetrabromobenzene-based molecular alloys – a tool for tailoring the temperature of the thermosalient phase transition. Journal of Materials Chemistry C, 13 (13). pp. 6539-6546. ISSN 2050-7526

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Abstract

A series of molecular alloys of 1,2,4,5-tetrabromobenzene and 1,2,4,5-tetrachlorobenzene with varying compositions were prepared in an attempt to obtain jumping crystals with adjustable temperature of thermosalient phase transition. Molecular alloys were studied with a combination of thermal and structural techniques (DSC, SCXRD, XRPD, hot-stage microscopy). Alloys with a high 1,2,4,5-tetrabromobenzene content (more than 90 wt%) exhibited thermosalient behaviour. Thermosalient alloys exhibited negative uniaxial thermal expansion and colossally large coefficients of thermal expansion (both linear and volumetric), with unit cell parameters increasing proportionally with tetrabromobenzene content. Finally, it was found that the temperature of phase transition increases linearly with the tetrabromobenzene content, from 30.13 °C to 45.33 °C, meaning that the tuning temperature of thermosalient mechanic response was successfully achieved.

Item Type:	Article
Uncontrolled Keywords:	molecular alloys ; thermosalient
Subjects:	NATURAL SCIENCES > Physics
Divisions:	Division of Materials Chemistry Division of Materials Physics
Projects:	Project title Project leader Project code Project type Centar izvrsnosti u kemiji - CIuK-CIuK Josip Požar; Mirta Rubčić; Ivana Biljan KK.01.1.1.02.0016 EK Centar za Napredna Istraživanja Kompleksnih Sustava-CeNIKS Mihael Srđan Grbić; Emil Tafra KK.01.1.1.02.0013 EK
Depositing User:	Lorena Palameta
Date Deposited:	08 May 2025 07:07
URI:	http://fulir.irb.hr/id/eprint/9815
DOI:	10.1039/D4TC04615C

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