A Spontaneous Magnetic Moment in an Organic Radical: Synthesis and Characterization of Benzodioxepinyl-1,3,2-dithiazolyl

Leckie, Dominique ; Harb, Mohamad ; Mroz, Natalia ; Wrixon, Justin D. ; Campo, Javier ; Arauzo, Ana (Universidad de Zaragoza) ; Bakhshi, Hamed ; Pilkington, Melanie ; Rawson, Jeremy M.

Resumen: The synthesis of the 1,3,2-dithiazolyl radical (1) derived from 3,4-dihydro-2H-1,5-benzodioxepine is described. Crystals of 1 were grown by vacuum sublimation and adopt the orthorhombic space group Pbca. DC SQUID magnetometry reveals Curie–Weiss behavior for T > 20 K (C = 0.376 emu K mol–1 and θ = +5.7 K) consistent with local ferromagnetic interactions. The presence of weaker antiferromagnetic interactions led to magnetic ordering as a canted antiferromagnet (TN = 3.8 K) with a small spontaneous moment (2.5 × 10–4 Nβ) and a small coercivity (ca. 8 Oe) at 2 K. Magnetic ordering was reflected in a field dependence of the magnetic susceptibility below 3.8 K and a peak in the low temperature heat capacity data. A canting angle of 0.08° was estimated from M vs H data.

Idioma: Inglés

DOI: 10.1021/jacs.4c09796

Año: 2024

Publicado en: Journal of the American Chemical Society 146, 46 (2024), 31371–31376
ISSN: 0002-7863

Factor impacto JCR: 15.6 (2024)

Categ. JCR: CHEMISTRY, MULTIDISCIPLINARY rank: 17 / 239 = 0.071 (2024) - Q1 - T1

Factor impacto SCIMAGO: 5.554 - Biochemistry (Q1) - Colloid and Surface Chemistry (Q1) - Chemistry (miscellaneous) (Q1) - Catalysis (Q1)

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)