From two-dimensional double decker architecture to three-dimensional pcu framework with one-dimensional tube: Syntheses, structures, luminescence, and magnetic studies

Feng X.; Wang J.; Liu B.; Wang L.; Zhao J.; Ng S.

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From two-dimensional double decker architecture to three-dimensional pcu framework with one-dimensional tube: Syntheses, structures, luminescence, and magnetic studies

机译：从二维双层结构到具有一维管的三维pcu框架：合成，结构，发光和磁性研究

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The hydrothermal reactions of lanthanide salts with substituted imidazole- 4,5-dicarboxylic acids in the presence of aliphatic carboxylates afforded a new family of lanthanide metal-organic frameworks formulated as {Y _3[(Heimda) _4(μ _2-HCOO)·3- H _2O]·H _2O} _n (1Y), {[Gd _3(Heimda) _4 (μ _2-HCOO)·4H _2O]·2H _2O}n (2Gd), {[Tb _3(Heimda) _4(μ _2- HCOO)·4H _2O]·2H _2O}n (3Tb) and {[Nd _3(Hpimda) _2(μ2-HCOO) (μ _2 -C _2O _4) _2·6H _2O]·4H _2O} _n (4Nd), (H _3eimda = 2-ethyl-1H-imidazole-4, 5-dicarboxylic acid, while H _3pimda = 2-propyl-1H-imidazole-4,5- dicarboxylic acid). The structural diversity and photophysical and magnetic properties have been investigated. The polymer 3 triggers intense characteristic lanthanide-centered green luminescence under UV excitation, and it exhibits gradually increasing luminescence intensities when dispersed in water, ethanol, and DMSO as suspensions. After water molecules are liberated from the condensed frameworks of 4, the evacuated product (4a) exhibits nitrogen sorption properties at 77 K with a hysteresis, as well as strong characteristic emissions of the Nd(III) ion in the near-infrared (NIR) region. Polymer 2 displays very weak but significant ferromagnetic couplings between adjacent Gd(III) ions through the carboxylate bridging, whereas the depopulation of the Stark levels or possible antiferromagnetic interactions within both polymers 4 and 4a leads to a continuous decrease of XM ~T when the samples are cooled from 300 to 2 K.

机译：镧系元素盐与取代的咪唑-4,5-二羧酸在脂肪族羧酸盐存在下的水热反应提供了一系列新的镧系元素金属有机骨架，公式为{Y _3 [（Heimda）_4（μ_2-HCOO）·3] -H _2O]·H _2O} _n（1Y），{[Gd _3（Heimda）_4（μ_2-HCOO）·4H _2O]·2H _2O} n（2Gd），{[Tb _3（Heimda）_4（μ _2- HCOO）·4H _2O]·2H _2O} n（3Tb）和{[Nd _3（Hpimda）_2（μ2-HCOO）（μ_2 -C _2O _4）_2·6H _2O]·4H _2O} _n（4Nd ）（H _3 eimda = 2-乙基-1H-咪唑-4，5-二羧酸，而H _3 pimda = 2-丙基-1H-咪唑-4,5-二羧酸）。已经研究了结构多样性以及光物理和磁性。聚合物3在UV激发下触发强烈的以镧系元素为中心的绿色发光，并且当以水，乙醇和DMSO的悬浮液形式分散时，其显示出逐渐增加的发光强度。从4的缩合骨架中释放出水分子后，抽空出的产物（4a）在77 K处显示出具有滞后性的氮吸附特性，并且在近红外（NIR）中强烈释放出Nd（III）离子。地区。聚合物2在相邻的Gd（III）离子之间通过羧酸键桥联显示出非常弱但显着的铁磁耦合，而当样品进行采样时，聚合物4和4a内的Stark数量减少或可能的反铁磁相互作用导致XM〜T连续降低。从300 K冷却到2 K

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《Crystal growth & design》 |2012年第2期|共12页
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Feng X.; Wang J.; Liu B.; Wang L.; Zhao J.; Ng S.;
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From two-dimensional double decker architecture to three-dimensional pcu framework with one-dimensional tube: Syntheses, structures, luminescence, and magnetic studies

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