Synthesis, Structure, and Magnetic Properties of [MnIII(salpn)NCS]n, a Helical Polymer, and the Dimer [MnIII(salpn)NCS]2. Weak Ferromagnet

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Synthesis, Structure, and Magnetic Properties of [MnIII(salpn)NCS]n, a Helical Polymer, and the Dimer [MnIII(salpn)NCS]2. Weak Ferromagnet

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作者：S. Sailaja ; K. Rajender Reddy ; M. V. Rajasekharan ; C. Hureau ; E. Rivi&egrave ; re ; J. Cano ; and J.-J. Girerd
刊名：Inorganic Chemistry
出版年：2003
出版时间：January 13, 2003
年：2003
卷：42
期：1
页码：180 - 186
全文大小：143K
年卷期：v.42,no.1(January 13, 2003)
ISSN：1520-510X

文摘

Dimeric [Mn(salpn)NCS]B>2 (1) and polymeric [Mn(salpn)NCS]_n (2) are formed by the reaction of Mn(CH₃CO₂)₂·4H₂O, the schiff base, and thiocyanate. The formation of the two polymorphic forms is solvent and temperaturedependent. 1: orthorhombic, space group Pbca, with a = 12.573(2) Å, b = 13.970(7) Å, c = 18.891(9) Å, andZ = 8. 2: orthorhombic, space group Pna2₁, with a = 12.5277(14) Å, b = 11.576(2) Å, c = 11.513(2) Å, andZ = 4. The dimers in 1 are held together by weak noncovalent S···

(phenyl) interactions leading to a chain alongthe a-axis. Each monomeric unit of the polymer in 2 is related to its adjacent ones by a 2-fold screw axis leadingto a helix along the c-axis. The exchange coupling is nondetectable in the dimer. The magnetic susceptibility of thehelical chain fits a classical chain law with J = -3.2 cm^-¹ and shows a weak ferromagnetic ordering below 7 Kdue to spin canting effects.