End-to-end azide-bridged manganese(III) chain compounds: Field-induced magnetic phase transitions and variation of T C to 38 K depending on the side groups of the schiff bases

Jung Hee Yoon, Woo Ram Lee, Dae Won Ryu, Jin Wuk Lee, Sung Won Yoon, Byoung Jin Suh, Hyoung Chan Kim, Chang Seop Hong

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Abstract

Three one-dimensional coordination polymers [Mn(L)(N3)] n [L = L1 (1), L2 (2), L3 (3); L1H2 = N,N′-bis(5- chlorosalicylideneiminato)-1,3-diaminopentane, L2H2 = N,N′-bis(5-bromosalicylideneiminato)-1,3-diaminopentane, L3H2 = N,N′-bis(5-bromosalicylideneiminato)-1,3-diamino-2-dimethylpropane] bridged by end-to-end azides were prepared. The crystal systems differ according to the Schiff bases used. Each Mn atom adopts a typical Jahn-Teller distortion. The helicity of the chains occurs in a racemic manner only for 2. No noncovalent forces are relevant in 2, while π-π contacts are visible in 1 and 3. Magnetic measurements show the presence of apparent spin canting. Complexes 1 and 3 exhibit a field-induced metamagnetic transition from an antiferromagnetic state to a weak ferromagnetic phase, whereas 2 embraces a field-induced two-step magnetic phase transition. The critical temperature is observed at 38 K for 2, which is relatively higher than those for 1 (11 K) and 3 (10 K). The pronounced long-range order may contribute from intrachain exchange couplings and through-space dipolar interactions between adjacent chains.

Original languageEnglish
Pages (from-to)10777-10785
Number of pages9
JournalInorganic Chemistry
Volume50
Issue number21
DOIs
Publication statusPublished - 2011 Nov 7

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ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry

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