title: The O-P-O bridged Mn2(salen)2 chains showing coexistence of single chain magnet and metamagnet behaviour.
abstract: Three new chain compounds in which the Mn2(salen)2 dimers are bridged by O-P-O units are reported, namely, [Mn2(salen)2(C6H9PO3H)](ClO4) (1), [Mn2(salen)2(C6H5PO3H)](ClO4) (2) and [Mn2(salen)2(C6H5PHO2)](ClO4) (3). The phosphonate or phosphinate ligands adopt a syn-anti bidentate bridging mode in 1, while a syn-syn bidentate bridging mode in 2 and 3, thus leading to a difference in the Mn-O···O-Mn torsion angle over the O-P-O bridge. Compound 1 shows a paramagnetic behavior with dominant antiferromagnetic interactions. In compounds 2 and 3, the antiferromagnetic interactions through the O-P-O bridges are considerably stronger than those in 1. They display coexistence of single chain magnet (SCM) behaviour with a spin canted structure and metamagnetism at low temperature. The results demonstrate that the magnetic dynamics of the O-P-O bridged Mn2(salen)2 chains may be modulated by selecting suitable phosphonate or phosphinate ligands.
authors: State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, P. R. China. lmzheng@nju.edu.cn.
authors: Ting-Ting
authors: TT
authors: Wang
authors: Min
authors: M
authors: Ren
authors: Song-Song
authors: SS
authors: Bao
authors: Zhong-Sheng
authors: ZS
authors: Cai
authors: Bin
authors: B
authors: Liu
authors: Ze-Hua
authors: ZH
authors: Zheng
authors: Zhong-Li
authors: ZL
authors: Xu
authors: Li-Min
authors: LM
authors: Zheng