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首页> 外文期刊>Crystal growth & design >A One-Dimensional Coordination Polymer Assembled from a Macrocyclic Mn(III) Single-Molecule Magnet and Terephthalate
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A One-Dimensional Coordination Polymer Assembled from a Macrocyclic Mn(III) Single-Molecule Magnet and Terephthalate

机译：由大环Mn（III）单分子磁体和对苯二甲酸酯组装的一维配位聚合物

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Herein the strategy of deliberate assembly of stable soluble macrocyclic single-molecule magnets (SMMs), using appropriately chosen linkers to bridge the axial sites, as a controlled way of forming single-chain magnets (SCMs) is tested. First, the manganese(III) macrocyclic complex, [Mn-III(L-Pr)(NCS)(2)] (1), of the monoanionic tetradentate equatorial-N4-donor macrocyclic (L-Pr)(-) ligand (formed from [1 + 1] Schiff base condensation of 2,2'-iminobisbenzaldehyde and dipropylenetriamine) is shown to be an SMM. Then, the 1:1 reaction of SMM 1 with sodium terephthalate linkers in H2O/DMF is shown, by X-ray structure determination, to form dark red single crystals of the desired one-dimensional (ID) coordination polymer, [Mn-III(L-Pr)(tpa)](n)center dot nH(2)O center dot 0.5nDMF (2), of alternating dicationic macrocycles [Mn-III(L-Pr)](2+) (from 1) linked by the bridging dianionic linkers [tpa](2-). Despite having the desired structural features, magnetic measurements show that 2 is an SMM, not an SCM, as the coupling along the ID coordination polymer is negligible (with Delta(eff)/k(B) = 13.7(5) K and tau(0) = 1.4(5) x 10(-7) s). Future attempts to use this strategy of linking macrocyclic SMMs together to access SCMs will clearly require the use of linkers that are able to more efficiently relay the magnetic information along the resulting chain.
机译：Herein the strategy of deliberate assembly of stable soluble macrocyclic single-molecule magnets (SMMs), using appropriately chosen linkers to bridge the axial sites, as a controlled way of forming single-chain magnets (SCMs) is tested.首先，锰（III）单环核复合物[Mn-III（L-Pr）（NCS）（2）]（1），其单碘酸环核酸赤道-N4-供体宏环（L-PR）（ - ）配体（由[1 + 1] Schiff基浓缩2,2'-Iminobisbenzaldehyde和双丙二酰胺的缩合形成）显示为SMM。然后，通过X射线结构测定显示H 2 O / DMF中对苯二甲酸钠接头的1：1反应，形成所需的一维（ID）配位聚合物的暗红色单晶，[Mn-III （L-PR）（TPA）]（N）中心点NH（2）O中心点0.5ndmf（2），交替的直译宏ycles [Mn-III（L-PR）]（2+）（1）连接通过桥接DianionIC接头[TPA]（2-）。尽管具有所需的结构特征，但磁测量表明，2是SMM，而不是SCM，因为沿ID配位聚合物的偶联是可忽略的（具有δ（EFF）/ K（B）= 13.7（5）K和TAU（ 0）= 1.4（5）x 10（-7））。将来尝试使用这种策略将宏线SMM联系在一起访问SCMS将清楚地需要使用能够更有效地中继磁性信息的链接器沿所得链中继的链接器。

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