On the impact of metal ion proportion on the physical properties of heterometallic metal–organic frameworks,CrystEngComm

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On the impact of metal ion proportion on the physical properties of heterometallic metal–organic frameworks
CrystEngComm ( IF 2.6 ) Pub Date : 2020-06-30 , DOI: 10.1039/d0ce00578a
Justyna Trzmiel _{1,

2,

3,

4} , Paulina Peksa _{2,

3,

4,

5} , Maciej Ptak _{4,

6,

7,

8} , Katarzyna Fedoruk _{2,

3,

4,

5} , Adam Sieradzki _{2,

3,

4,

5}

Affiliation

Indications of desirable polar order in ethylammonium C₂H₅NH₃(EtA) metal formate [EtA][Na_0.5Cr_0.5(HCOO)₃] and the lack of it in [EtA][K_0.5Cr_0.5(HCOO)₃] raised important questions on the origin of structural phase transition and dipolar dynamics in these kinds of compounds. In this paper we provide results of experimental studies performed on the mixed frameworks, which may give more insight into understanding these phenomena. We report the synthesis of four heterometallic metal–organic frameworks [CH₃CH₂NH₃][K_xNa_0.5−xCr_0.5(HCOO)₃] with various compositions (x = 0, 0.04, 0.22, and 0.5). Broadband dielectric spectroscopy assisted by vibrational spectroscopy allows us to determine the role of EtA⁺ motions in the structural phase transition in the investigated compounds. We clearly demonstrate that the increase of the K/Na ratio results in freer translational movements of the EtA⁺ cations.

中文翻译：

关于金属离子比例对杂金属-有机骨架物理性质的影响

甲酸乙铵C ₂ H ₅ NH ₃（EtA）金属酸盐[EtA] [Na _0.5 Cr _0.5（HCOO）₃ ]中期望的极性序号，[EtA] [K _0.5 Cr _0.5（HCOO）₃ ]中缺少极性序号的指示提出了关于这些化合物的结构相变和偶极动力学起源的重要问题。在本文中，我们提供了在混合框架上进行的实验研究的结果，这可能会为了解这些现象提供更多的见识。我们报告了四种杂金属金属-有机骨架[CH ₃ CH ₂ NH ₃ ] [K _x的合成Na _{0.5- x} Cr _0.5（HCOO）₃ ]具有各种组成（x = 0、0.04、0.22和0.5）。借助振动光谱学的宽带介电光谱学，我们可以确定EtA ⁺运动在所研究化合物中结构相变中的作用。我们清楚地表明，钾/钠比的增加导致EtA ⁺阳离子的自由平移运动。

更新日期：2020-07-20

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