New alkali earth metal–organic frameworks with a very high thermal stability: synthesis, crystal structure, and characterization of AE[NC5H3(CO2)2] (AE = Ba or Sr)

CrystEngComm ◽  
2011 ◽  
Vol 13 (14) ◽  
pp. 4599 ◽  
Author(s):  
Min Kyung Kim ◽  
Kang Min Ok
Keyword(s):  
Crystal Structure ◽  
Thermal Stability ◽  
Metal Organic Frameworks ◽  
Earth Metal ◽  
High Thermal Stability ◽  
Alkali Earth Metal ◽  
Alkali Earth ◽  
Metal Organic ◽  
Very High

Two Novel Triazole-Based Metal - Organic Frameworks Consolidated by a Flexible Dicarboxylate Co-ligand: Hydrothermal Synthesis, Crystal Structure, and Luminescence Properties

2008 ◽  
Vol 61 (10) ◽  
pp. 813 ◽  
Author(s):  
En-Cui Yang ◽  
Qing-Qing Liang ◽  
Xiu-Guang Wang ◽  
Xiao-Jun Zhao
Keyword(s):  
Crystal Structure ◽  
Thermal Stability ◽  
Metal Organic Frameworks ◽  
Three Dimensional ◽  
Structure Property ◽  
Hydrogen Bond Acceptor ◽  
X Ray Crystallography ◽  
Carboxylate Groups ◽  
Elemental Analyses ◽  
Metal Organic

To explore the effects of a co-ligand on the construction of mixed-ligand metal–organic frameworks (MOFs), two new triazole-based complexes with a flexible dicarboxylate as a co-ligand, {[Zn4(trz)4(gt)2(H2O)2](H2O)2}n 1 and {[Cd2(trz)2(gt)(H2O)2](H2O)4}n 2 (Htrz = 1,2,4-triazole; H2gt = glutaric acid), were synthesized and their structures were fully characterized by elemental analyses, IR spectroscopy, and single-crystal X-ray crystallography. Their thermal stability and luminescence emissions were further investigated to establish their structure–property relationship. Crystal structure determination showed that 1 is a neutral two-dimensional pillared-bilayer network consisting of 14-membered hydrophobic channels, whereas 2 is an infinite three-dimensional framework constructed from tetranuclear [Cd4(trz)4]4+ subunits. Interestingly, the overall structure of both MOFs can be solely supported by ZnII/CdII and trz anions, and were further consolidated by the introduction of a flexible gt co-ligand. In addition, the carboxylate groups in the co-ligand can also serve as a weak O–H···O hydrogen-bond acceptor to capture guest water molecules. The synchronous weight-loss behaviour of trz and gt anions presented by thermogravometric curves suggest their cooperative contributions to the thermal stability of the MOFs. In contrast, the fluorescence emissions of two complexes are significantly dominated by the core trz ligand, rather than the gt co-ligand and metal ions.

Rb2SeOCl4·H2O: a polar material among the alkali metal selenite halides with a strong SHG response

2016 ◽  
Vol 45 (44) ◽  
pp. 17723-17728 ◽  
Author(s):  
Qi Wu ◽  
Hongming Liu ◽  
Lei Kang ◽  
Zheshuai Lin ◽  
Xianggao Meng ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Alkali Metal ◽  
Earth Metal ◽  
Structure And Properties ◽  
Polar Material ◽  
Alkali Earth Metal ◽  
Alkali Earth

The synthesis, crystal structure and properties of Rb2SeOCl4·H2O, the first polar material among the A–Se–O–X systems (A = alkali metal or alkali-earth metal), is presented. It shows a powder SHG response of 8 times that of KDP.

Characterization of NOx sensor using doped In2O3

2001 ◽  
Vol 16 (5) ◽  
pp. 1389-1395 ◽  
Author(s):  
Shinichiro Tanaka ◽  
Takao Esaka
Keyword(s):  
Thermal Analysis ◽  
Response Times ◽  
Earth Metal ◽  
Adsorption Ability ◽  
Alkali Earth Metal ◽  
Alkali Earth ◽  
Nox Sensor ◽  
Highly Sensitive ◽  
Sensor Monitoring

To develop a highly sensitive gas sensor monitoring NOx, various kinds of n-type semiconductors made of In2O3 were prepared, and the relations between doped elements and gas sensitivities or response times were studied. Consequently, it was found that the samples doped with less than 1 at.% alkali-earth metal components have high sensitivities and responsiveness. The gas-absorbing phenomena were investigated using highly sensitive thermal analysis. From the result, it was indicated that alkali-earth component-doped In2O3 materials have higher adsorption ability of NOx than pure In2O3 has.

Lanthanide(III) complex metal-organic frameworks with a phenanthroline-carboxylate derivate and 2,5-thiophenedicarboxylate coligand: hydrothermal synthesis, crystal structure, and high thermostability

2018 ◽  
Vol 73 (5) ◽  
pp. 311-317
Author(s):  
Zhao Xu ◽  
Fengqin An ◽  
Xiaohui Ma ◽  
Huiliang Zhou ◽  
Weiming Song ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thermal Stability ◽  
Metal Organic Frameworks ◽  
Decomposition Temperature ◽  
Thermal Decomposition Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metal Organic ◽  
3D Networks ◽  
Point Symbol

AbstractBased on 2-(4-carboxyphenyl)imidazo[4,5-f]-1,10-phenanthroline (HNCP) and 2,5-thiophenedicarboxylate (TDC2−) ligands, three new lanthanide-containing (Sm, Nd, and Pr) compounds, [Sm(NCP)(TDC)]n (1), [Nd(NCP)(TDC)]n·2n(H2O)0.5 (2), and [Pr(NCP)(TDC)]n·n(H2O)0.5 (3), have been synthesized using the hydrothermal method and structurally characterized using single-crystal X-ray diffraction. Structural analyses have revealed that compounds 1–3 are 3D isostructural metal-organic frameworks in which the [Ln2(COO)4] dimers can be regarded as 6-connecting nodes, and the TDC2− and NCP− ligands are simplified as connectors to achieve the double interspersed 3D networks with the point symbol {412·63}. Thermogravimetric analysis has illustrated that the rigid architecture contributes to superior thermal stability with a thermal decomposition temperature of more than 400°C for the resulting metal-organic frameworks.

Microwave synthesis and gas sorption of calcium and strontium metal–organic frameworks with high thermal stability

CrystEngComm ◽  
2012 ◽  
Vol 14 (4) ◽  
pp. 1219 ◽  
Author(s):  
Chun-Ting Yeh ◽  
Wei-Cheng Lin ◽  
Sheng-Han Lo ◽  
Ching-Che Kao ◽  
Chia-Her Lin ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Microwave Synthesis ◽  
Metal Organic Frameworks ◽  
High Thermal Stability ◽  
Gas Sorption ◽  
Metal Organic
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