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Hexanuclear and Tetranuclear Mn/Ln clusters using 2‐(hydroxymethyl)pyridine: Synthesis, structures and magnetic properties
Author(s) -
Sun Lei,
Chen Hui,
Chen Changneng
Publication year - 2017
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.3846
Subject(s) - chemistry , hydroxymethyl , crystallography , manganese , antiferromagnetism , ligand (biochemistry) , cubane , pyridine , magnetic susceptibility , ground state , acetonitrile , lanthanide , crystal structure , stereochemistry , inorganic chemistry , medicinal chemistry , ion , biochemistry , physics , receptor , organic chemistry , quantum mechanics , condensed matter physics , chromatography
Reactions of manganese benzoate dihydrate and lanthanide nitrate hexahydrate with 2‐(hydroxymethyl)pyridine (hmpH) as ligand in the mixture solutions of acetonitrile and ethanol according to different molar ratios of NEt 3 generated two kinds of Mn‐Ln compounds [Mn III 4 La III 2 (O) 2 (hmp) 7 (PhCO 2 ) 2 (NO 3 ) 5 ] ·5H 2 O ( 1 ) and [Mn III 2 Gd III 2 (hmp) 6 (PhCO 2 ) 4 (NO 3 ) 2 ] ·3CH 3 CN·3C 2 H 5 OH·2H 2 O ( 2 ). By comparison of the two compounds, there exist considerable effects of reaction alkalinity on the structures and magnetic properties of products. Compound 1 possesses a core of [Mn III 4 La III 2 ( μ 4 ‐O)( μ 3 ‐O)( μ 3 ‐OR)( μ 2 ‐O) 7 ] 2− , which comprises three face‐sharing defected cubane units. The core topology represents a new core type of Mn‐Ln clusters. Compound 2 has a planar‐butterfly structure. The solid‐state dc magnetic susceptibility analyses indicate the antiferromagnetic interactions within compound 1 and ferromagnetic interactions within compound 2 . Compound 1 has an S = 0 ground state, while compound 2 possesses an S = 11 ground state, fitting of the dc data for the tetranuclear Mn 2 Gd 2 with the Magpack program gives parameters of J Mn‐Mn = 3.11 cm −1 , J Mn‐Gd = 0.02 cm —1 and g = 1.96.