scholarly journals Amino acids as highly efficient modulators for single crystals of zirconium and hafnium metal–organic frameworks

2016 ◽  
Vol 4 (18) ◽  
pp. 6955-6963 ◽  
Author(s):  
Ross J. Marshall ◽  
Claire L. Hobday ◽  
Colin F. Murphie ◽  
Sarah L. Griffin ◽  
Carole A. Morrison ◽  
...  
Keyword(s):  
Amino Acids ◽  
Single Crystal ◽  
Single Crystals ◽  
Crystal Structures ◽  
Metal Organic Frameworks ◽  
Single Crystal Structures ◽  
Highly Efficient ◽  
Metal Organic ◽  
P Addition

Addition of small quantities of amino acids to solvothermal and microwave syntheses of Zr and Hf MOFs drastically improves their crystallinity to the extent that single crystal structures can be obtained.

Hierarchically porous metal–organic frameworks with single-crystal structures and their enhanced catalytic properties

CrystEngComm ◽  
2018 ◽  
Vol 20 (38) ◽  
pp. 5754-5759 ◽  
Author(s):  
Hang Zhang ◽  
Jinhao Huo ◽  
Jinqing Li ◽  
Feier Li ◽  
Chongxiong Duan ◽  
...  
Keyword(s):  
Single Crystal ◽  
Crystal Structures ◽  
Catalytic Properties ◽  
Metal Organic Frameworks ◽  
Porous Metal ◽  
Hydrothermal Conditions ◽  
Hierarchically Porous ◽  
Single Crystal Structures ◽  
Metal Organic

Stable hierarchically porous metal–organic frameworks (HP-MOFs) have been successfully synthesized under hydrothermal conditions using a template strategy.

scholarly journals Hydrogels formed from Fmoc amino acids

CrystEngComm ◽  
2015 ◽  
Vol 17 (42) ◽  
pp. 8047-8057 ◽  
Author(s):  
Emily R. Draper ◽  
Kyle L. Morris ◽  
Marc A. Little ◽  
Jaclyn Raeburn ◽  
Catherine Colquhoun ◽  
...  
Keyword(s):  
Amino Acids ◽  
Molecular Weight ◽  
Single Crystal ◽  
Crystal Structures ◽  
Diffraction Data ◽  
Low Molecular Weight ◽  
X Ray Diffraction ◽  
X Ray ◽  
Single Crystal Structures

A number of Fmoc amino acids can be effective low molecular weight hydrogelators; we compare single crystal structures to fibre X-ray diffraction data.

scholarly journals Single Crystals of Electrically Conductive 2D MOFs: Structural and Electrical Transport Properties

2019 ◽  
Author(s):  
Robert W. Day ◽  
D. Kwabena Diako ◽  
Mehdi Rezaee ◽  
Lucas R. Parent ◽  
Grigorii Skorupskii ◽  
...  
Keyword(s):  
Single Crystal ◽  
Single Crystals ◽  
Electrical Transport ◽  
Prolonged Exposure ◽  
Metal Organic Frameworks ◽  
Two Dimensions ◽  
Conductivity Measurements ◽  
Electrical Transport Properties ◽  
Electrically Conductive ◽  
Metal Organic

Crystalline, electrically conductive, and intrinsically porous materials are rare. Layered 2D metal-organic frameworks (MOFs) break this trend. They are porous crystals that exhibit high electrical conductivity and are novel platforms for studying fundamentals of electricity and magnetism in two dimensions.1-8 Despite demonstrated applications,9-13 electrical transport in these remains poorly understood because of a lack of single crystal studies. Here, studies of single crystals of two 2D MOFs, Ni3(HITP)2 and Cu3(HHTP)2, uncover critical insights into their structure and transport. Conductivity measurements down to 0.3 K suggest metallicity for mesoscopic single crystals of Ni3(HITP)2, which contrasts with apparent activated conductivity for polycrystalline films. Microscopy studies further reveal that these MOFs are not isostructural as previously reported.14 Notably, single rods exhibit conductivities up to 150 S/cm, which persist even after prolonged exposure to the ambient. These single crystal studies confirm that 2D MOFs hold promise as molecularly tunable platforms for fundamental science and applications where porosity and conductivity are critical.<br>

scholarly journals Two metal–organic frameworks based on Sr2+ and 1,2,4,5-tetrakis(4-carboxyphenyl)benzene linkers

2021 ◽  
Vol 77 (12) ◽  
Author(s):  
Muhammad Usman ◽  
Lydia Ogebule ◽  
Raúl Castañeda ◽  
Evgenii Oskolkov ◽  
Tatiana Timofeeva
Keyword(s):  
Hydrogen Bonding ◽  
Single Crystal ◽  
Crystal Structures ◽  
Structural Control ◽  
Metal Organic Frameworks ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metal Organic ◽  
Solvent Systems ◽  
Semiconductor Properties

Two structurally different metal–organic frameworks based on Sr2+ ions and 1,2,4,5-tetrakis(4-carboxyphenyl)benzene linkers have been synthesized solvothermally in different solvent systems and studied with single-crystal X-ray diffraction technique. These are poly[[μ12-4,4′,4′′,4′′′-(benzene-1,2,4,5-tetrayl)tetrabenzoato](dimethylformamide)distrontium(II)], [Sr2(C34H18O8)(C3H7NO)2] n , and poly[tetraaqua{μ2-4,4′-[4,5-bis(4-carboxyphenyl)benzene-1,2-diyl]dibenzoato}tristrontium(II)], [Sr3(C34H20O8)2(H2O)4]. The differences are noted between the crystal structures and coordination modes of these two MOFs, which are responsible for their semiconductor properties, where structural control over the bandgap is desirable. Hydrogen bonding is present in only one of the compounds, suggesting it has a slightly higher structural stability.

scholarly journals Single Crystals of Electrically Conductive 2D MOFs: Structural and Electrical Transport Properties

2019 ◽  
Author(s):  
Robert W. Day ◽  
D. Kwabena Diako ◽  
Mehdi Rezaee ◽  
Lucas R. Parent ◽  
Grigorii Skorupskii ◽  
...  
Keyword(s):  
Single Crystal ◽  
Single Crystals ◽  
Electrical Transport ◽  
Prolonged Exposure ◽  
Metal Organic Frameworks ◽  
Two Dimensions ◽  
Conductivity Measurements ◽  
Electrical Transport Properties ◽  
Electrically Conductive ◽  
Metal Organic

Crystalline, electrically conductive, and intrinsically porous materials are rare. Layered 2D metal-organic frameworks (MOFs) break this trend. They are porous crystals that exhibit high electrical conductivity and are novel platforms for studying fundamentals of electricity and magnetism in two dimensions.1-8 Despite demonstrated applications,9-13 electrical transport in these remains poorly understood because of a lack of single crystal studies. Here, studies of single crystals of two 2D MOFs, Ni3(HITP)2 and Cu3(HHTP)2, uncover critical insights into their structure and transport. Conductivity measurements down to 0.3 K suggest metallicity for mesoscopic single crystals of Ni3(HITP)2, which contrasts with apparent activated conductivity for polycrystalline films. Microscopy studies further reveal that these MOFs are not isostructural as previously reported.14 Notably, single rods exhibit conductivities up to 150 S/cm, which persist even after prolonged exposure to the ambient. These single crystal studies confirm that 2D MOFs hold promise as molecularly tunable platforms for fundamental science and applications where porosity and conductivity are critical.<br>

scholarly journals Synthesis and Single Crystal Structures of N-Substituted Benzamides and Their Chemoselective Selenation/Reduction Derivatives

Molecules ◽  
2021 ◽  
Vol 26 (8) ◽  
pp. 2367
Author(s):  
Guoxiong Hua ◽  
Cameron L. Carpenter-Warren ◽  
David B. Cordes ◽  
Alexandra M. Z. Slawin ◽  
J. Derek Woollins
Keyword(s):  
Single Crystal ◽  
Crystal Structures ◽  
X Ray ◽  
Single Crystal Structures ◽  
Highly Efficient ◽  
Substituted Benzamides

A series of N-aryl-N-(2-oxo-2-arylethyl) benzamides and cinnamides has been prepared. The reaction of the benzamides with Woollins’ reagent, a highly efficient chemoselective selenation/reduction reagent, gave the corresponding N-aryl-N-(arylenethyl) benzoselenoamides in good yields. Five representative single crystal X-ray structures are discussed.

Controlled Growth of the Non-centrosymmetric Zn(3-ptz)2 and Zn(Oh)(3-ptz) Metal-organic Frameworks

2019 ◽  
Author(s):  
javier enriquez ◽  
Ignacio Chi-Duran ◽  
Carolina Manquian ◽  
Felipe Herrera ◽  
Ruben Fritz ◽  
...  
Keyword(s):  
Single Crystal ◽  
Nonlinear Optical ◽  
Metal Organic Frameworks ◽  
Molar Ratio ◽  
Thermal Synthesis ◽  
Small Crystals ◽  
Alkaline Environments ◽  
Potential Applications ◽  
Metal Organic ◽  
Long Rod

Non-centrosymmetric single-crystal metal-organic frameworks (MOF) are promising candidates for phase-matched nonlinear optical communication, but typical hydrothermal synthesis produces small crystals with relatively low transmittance and poor phase matching. We study the effect of the metal-to-ligand molar ratio and reaction pH on the hydro-thermal synthesis of the non-centrosymmetric Zn(3-ptz)<sub>2</sub> and Zn(OH)(3-ptz) MOFs with <i>in-situ </i>ligand formation. In acidic environments, we find that decreasing the amount of ligand below the stoichiometric molar ratio 1:2 also produces highly transparent single-crystal octahedrons of <b>Zn(3-ptz)<sub>2</sub></b>. In alkaline environments, we obtain long rod-like <b>Zn(OH)(3-ptz) </b>crystals whose length exceeds previous reports by up to four orders of magnitude. Potential applications of these results in the development of MOF-based nonlinear optical devices are discussed.

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