A nickel(ii)–manganese(ii)-azido layered coordination polymer showing a three-dimensional ferrimagnetic order at 35 K. Issue 3 (18th December 2017)

• Record Type: Journal Article
• Authors: Ghosh, Sagar; Roy, Shuvayan; Liu, Cai-Ming; Mohanta, Sasankasekhar
• Is Part Of: Dalton transactions. Volume 47:Issue 3(2017)
• Page Start: 836
• Page End: 844
• Publication Date: 2017-12-18
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c7dt04032f
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : The synthesis, crystal structure and magnetic properties of a two-dimensional nickel(ii )–manganese(ii )–azido system are described. It is an interesting molecular magnet because it exhibits long-range ferrimagnetic ordering at a T c of 35 K and a hysteresis loop up to 20 K. Abstract : The work in this report describes the synthesis, characterization, crystal structure and magnetic properties of a two-dimensional azido-bridged Ni II Mn II heterometallic coordination polymer, [{(Ni II LMn II )2 (μ1, 1, 3 -N3 )2 }(μ1, 3 -N3 )2 ] n (1 ), in which the H2 L Schiff base is the [2 + 1] condensation product of 3-methoxysalicylaldehyde and 1, 3-diaminopropane. In1, two bis(μ-phenoxo)-μ1, 1, 3 -azido-Ni II Mn II dinuclear units are interlinked to form a dimer-of-dinuclear moiety {Ni II Mn II }2 ; the {Ni II Mn II }2 structural units are further interlinked with each other by μ1, 3 -azido ligands to form a layered coordination polymer. Upon cooling, the χ M T product slowly decreases from 300 K to about 100 K, then increases abruptly from 3.74 cm 3 K mol −1 at 100 K to 113.2 cm 3 K mol −1 at 30 K, indicating a ferrimagnetic behaviour; a three-dimensional magnetic order below 37 K was determined by the divergence in the ZFC-FC measurements and ac measurements, in which the peak temperature 35 K in the in-phase at different frequencies suggests that the Curie temperature is 35 K, whereas the out-of-phase is somewhat frequency dependent, due to the glassy magnet behaviour. The title compound is among the rare examples of metallo-organic systems having a magnetic ordering Curie temperature above 30 K. Other interesting aspects in1 regarding magnetic properties and structural features are discussed.