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Structure and magnetic properties of heterometallic coordination carboxylate polymers with cobalt and lithium atoms

机译:具有钴和锂原子的杂金属配位羧酸盐聚合物的结构和磁性

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摘要

Reactions between lithium pivalate and cobalt coordination polymers [Co_5(OH_2)(OH)(Piv)_9)L ~1) _4] _n (I) and [Co_2(OH_2)(Piv) _4(L ~2)_2] _n (II), where Piv-is the pivalate anion, L 1 is pyrazine, and L 2 is pyrimidine, result in new heterometallic polymers {[Li_2Co_2(Piv) _6(L ~1)_2]_2 MeCN} _n (III), {[Li_2Co_2(Piv)_6(L ~2)]_(0.5) MeCN} _n (IV), and [Li_2Co_2(Piv)_6(L ~2)_2] _n (V). The resulting compounds contain tetra-nuclear {Li_2Co_2(Piv)_6} fragments connected by neutral bridging ligands (pyrazine or pyrimidine) into layer structures. Crystal structures III-V are determined, and the magnetic properties of III and IV are studied.
机译:新戊酸锂与钴配位聚合物[Co_5(OH_2)(OH)(Piv)_9)L〜1)_4] _n(I)和[Co_2(OH_2)(Piv)_4(L〜2)_2] _n( II),其中Piv-为新戊酸酯,L 1为吡嗪,L 2为嘧啶,产生新的杂金属聚合物{[Li_2Co_2(Piv)_6(L〜1)_2] _2 MeCN} _n(III),{ [Li_2Co_2(Piv)_6(L〜2)] _(0.5)MeCN} _n(IV)和[Li_2Co_2(Piv)_6(L〜2)_2] _n(V)。所得化合物包含通过中性桥联配体(吡嗪或嘧啶)连接成层结构的四核{Li_2Co_2(Piv)_6}片段。确定晶体结构III-V,并且研究III和IV的磁性能。

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