One-Dimensional End-To-End Azide-Bridged MnIII Complexes Incorporating Alkali Metal Ions: Slow Magnetic Relaxations and Metamagnetism
✍ Scribed by Jung Hee Yoon; Jin Wuk Lee; Dae Won Ryu; Sung Won Yoon; Prof. Byoung Jin Suh; Dr. Hyoung Chan Kim; Prof. Chang Seop Hong
- Publisher
- John Wiley and Sons
- Year
- 2011
- Tongue
- English
- Weight
- 429 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0947-6539
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✦ Synopsis
Abstract
Three azide‐bridged Mn^III^ chains [Mn(3‐MeOsalpn)(N~3~)]**⋅**0.5 AClO~4~ (A=Na (1), K (2), Rb (3); 3‐MeOsalpn=N,N′‐propylenebis(3‐methoxysalicylideneiminato) dianion) incorporating alkali metal ions and perchlorate anions were systematically synthesized. The overall structure can be described as a one‐dimensional chain bridged by end‐to‐end azide ligands, although spatial arrangements of Jahn–Teller axes of Mn in 1 and 2 are different from that in 3. Relying on the alkali metal ions, magnetic properties are varied from a two‐step phase transition (1) to metamagnetic transitions (2 and 3). In this system, spin canting definitely plays a central role in giving rise to the apparent slow magnetic relaxations in 1 and 2 because application of a high external magnetic field tends to destroy single‐chain magnet (SCM) properties. Despite the existence of a long‐range antiferromagnetic order at T~N~, slow magnetic relaxation is notably observed in 2, which likely emanates from the operative spin canting below T~N~.