Dielectric and Magnetic Relaxations Exhibited in a 2D Parallel Interpenetrating Frustrated Star Net

• Published in: Chemistry : a European journal Vol. 28; no. 17; pp. e202104503 - n/a
• Main Authors: Ji, Cui‐Xian, Sun, Ying‐Xi, Ma, Shuai, Zhao, Jiong‐Peng, Liu, Fu‐Chen
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 22.03.2022
• Subjects: antiferromagnetic; Antiferromagnetism; Chemistry; Coupling; Dielectric relaxation; Dielectric strength; Dipoles; geometrical frustration; Magnetic induction; Magnetic relaxation; Magnets; Room temperature; slow magnetic relaxation; two-dimensional structures; slow magnetic relaxation; dielectric relaxation; two-dimensional structures; antiferromagnetic; geometrical frustration
• ISSN: 0947-6539; 1521-3765
• DOI: 10.1002/chem.202104503

Constructing multiple functional geometric frustration magnets is a hot topic in solid state chemistry and material science. Herein, a two‐dimensional (2D) parallel interpenetrating “star” net complex [HDMPDA][Fe6(μ3‐O)2(μ‐O2CH)15] (1) was obtained successfully with HDMPDA (DMPDA=N, N’‐dimethyl‐1,3‐propanediamine) as charge balancer. The dipole reorientation of the rotator [HDMPDA]+ in the complex brings a structure transition which leads dielectric relaxation close to room temperature. Despite strong antiferromagnetic coupling existing between ions in the net, long‐range order temperature TN of the complex is suppressed to 4.2 K by geometric frustration. Interestingly, below TN, a canted antiferromagnetic state, accompanied with slow magnetic relaxation, is detected due to the lack of enough magnetic coupling between 2D layers. Thus, 1 is a particular multifunctional magnetic frustration material containing two different types of relaxations. Using organic ammonium HDMPDA (DMPDA=N, N’‐dimethyl‐1,3‐propanediamine) with a positive charge, a complex [HDMPDA][Fe6(μ3‐O)2(μ‐O2CH)15] (1) with a 2D parallel interpenetrating “star” net was successfully obtained. The complex exhibits properties as a frustrated material with TN=4.2 K, and also presents new functions with dielectric and slow magnetic relaxations.