A one dimensional coordination polymer composed of antiferromagnetically coupled disk-like [Mn7] units. Issue 43 (18th October 2018)

• Record Type: Journal Article
• Authors: Yang, En-Che; Huang, Han-Sheng; Huang, Shao-Yun; Huang, Shi-Yi; Chang, Yu-Ying; Lee, Gene-Hsiang; Sheu, Hwo-Shuenn; Chang, Chung-Kai
• Is Part Of: CrystEngComm. Volume 20:Issue 43(2018)
• Page Start: 6963
• Page End: 6969
• Publication Date: 2018-10-18
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c8ce01374h
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : A single-chain magnet (SCM) was constructed from disk-like Mn7 clusters linked by azide units. Abstract : The synthesis, characterization by X-ray analysis and magnetic properties of a one dimensional coordination polymer {[Mn7 (OH)2 (dhap)2 (N3 )3 (MeCN)4 (ClO4 )2 ]·2(MeCN)·2(ClO4 )}∞ (1 ) are reported. The ligand dhapH4 in the complex is 2, 6-bis[ N, N -di(hydroxyethyl)aminomethyl]pyridine. This compound crystallizes in the monoclinic space group C 2/ c . Each [Mn7 (OH)2 (dhap)2 (N3 )3 (MeCN)4 (ClO4 )2 ] unit (abbreviated by Mn7 ) is linked end-to-end by azido ligands to its neighboring units to form a one dimensional polymer. Magnetic susceptibility measurements indicate that the polymer is composed of S = 8 units with inter-Mn7 -unit antiferromagnetic coupling. The Jahn–Teller axes of the Mn7 units are arranged in a zigzag manner along the polymer chain which induces spin canting at low temperatures. The slow magnetization relaxation at low temperatures was evidenced by observing out-of-phase signals in ac magnetic susceptibility measurements that give U eff = 47.5 K and Δ 0 = 2.7 × 10 −13 s. This phenomenon also indicates that this one dimensional coordination polymer functions as a single-chain magnet (SCM).