X-ray Crystal Structure of Gallium Tris- (8-hydroxyquinoline): Intermolecular π−π Stacking Interactions in the Solid State

X-ray Crystal Structure of Gallium Tris- (8-hydroxyquinoline):  Intermolecular π−π Stacking Interactions in the Solid Stat

Luminescent <i>μ</i>-Ethynediyl and <i>μ</i>-Butadiynediyl Binuclear Gold(I) Complexes: Observation of ³(<i>ππ</i>*) Emissions from Bridging C<i>_n</i>^2- Units

The synthesis and X-ray structural and spectroscopic characterization for LAuC⋮CAuL·4CHCl3 and LAuC⋮C−C⋮CAuL·2CH2Cl2 (1·4CHCl3 and 2·2CH2Cl2, respectively; L = PCy3, tricyclohexylphosphine) are reported. The bridging Cn2- units are structurally characterized as acetylene or diacetylene units, with C⋮C distances of 1.19(1) and 1.199(8) Å for 1·4CHCl3 and 2·2CH2Cl2, respectively. An important consequence of bonding to Au(I) for the Cn2- moieties is that the lowest-energy electronic excited states, which are essentially acetylenic 3(ππ*) in nature, acquire sufficient allowedness via Au spin−orbit coupling to appear prominently in both electronic absorption and emission spectra. The origin lines for both complexes are well-defined and are observed at 331 and 413 nm for 1 and 2, respectively. Sharp vibronic progressions corresponding to v(C⋮C) are observed in both emission and absorption spectra. The acetylenic 3(ππ*) excited state of 2 has a long lifetime (τ0 = 10.8 μs) in dichloromethane at room temperature and is a powerful reductant (E°[Au2+/Au2*] ≤ −1.85 V vs SSCE)

Hydroxyphenyl-pyridine Beryllium Complex (Bepp₂) as a Blue Electroluminescent Material

A novel blue luminescent chelate complex Bepp2 (pp = 2-(2-hydroxyphenyl)pyridine) was synthesized as an electroluminescent material. The single-crystal X-ray diffraction study showed that there are intermolecular π· ··π interactions in the solid state of Bepp2. This structural character can facilitate charge transport ability. The photoluminescence and electroluminescence properties of Bepp2 were characterized. Bepp2 exhibits very strong photoluminescence at 440 nm in chloroform solution. Its PL quantum yield is 80% higher than that of Alq3 in solution. In this paper we report that Bepp2 can be used as an emitting material to fabricate blue light electroluminescent devices. The devices with the configuration of [ITO/Cu−Pc/TPD/Bepp2/LiF/Al] show electroluminescent efficiency up to 0.55 lm/W. Bepp2 shows blue EL emission centered at 450 nm. We also demonstrated that Bepp2 can be used as host material to prepare orange-red EL devices. For the devices of [ITO/TPD/DCM (2wt %) doped Bepp2/Al], orange-red color light was observed

Facile and Equipment-Free Data Encryption and Decryption by Self-Encrypting Pt(II) Complex

Luminescence switching materials are vital to various data security-related techniques, including data encryption–decryption. Here, we report a family of pseudopolymorphs based on a diimine–platinum­(II) complex, Pt­(Me3SiCCbpyCCSiMe3)­(CCC6H4Br-3)2 (1), and systematically studied the influence of stacking modes on luminescence switching behaviors. Upon exposure to heat or tetrahydrofuran vapor, these pseudopolymorphs exhibit unusual stacking mode-intervened luminescence switching (SMILS) property that non-columnar and quasi-columnar pseudopolymorphs undergo single- and multi-step conversion processes, respectively, to the same non-columnar products. Systematic studies revealed that the unique SMILS behavior is caused by the existence of stable intermediate products as well as different conversion processes of pseudopolymorphs with distinct stacking modes. Such a new property leads to the self-encryption function of 1, which is very important for improving the existing data encryption–decryption technique. On this basis, we developed a facile, reusable, equipment-free technique with 1 as the only starting material and realized data encryption–decryption successfully

Two Polymorphic Polyoxometalate-Based Metal–Organic Frameworks for the Efficient Synthesis of Functionalized Sulfoxides and Detoxification of Mustard Gas Simulants

The development of high-efficient catalysts for the oxidation reaction of sulfides received much attention in recent years due to the extensive applications of such reactions from the utility in pharmaceutical chemistry and biology to the detoxification of chemical warfare agents in war. Herein, we report two innovative polyoxometalate-based metal–organic frameworks (POMOFs) {[ε-PMo8VMo4VIO37(OH)3]­[Zn2(C10N2H8)­(H2O)2]2}2·8H2O (1-α and 1-β), which were characterized by elemental analysis, UV–vis diffuse reflectance spectroscopy, X-ray single-crystal and powder diffraction, X-ray photoelectron spectroscopy, and Fourier-transform infrared spectroscopy techniques in detail. Single-crystal X-ray diffraction analysis indicates that 1-α and 1-β are polymorphic with the identical compositions and analogical structures. Compounds 1-α and 1-β are both connected by Zn4-ε-Keggin polyoxoanions and 4,4′-bipyridine (bpy) ligands to form twofold interpenetrated three-dimensional POMOF structures. 1-β can be seen as a rotational polymorph of 1-α, that is, 1-α takes the b axis as the rotation axis and rotates ∼39° clockwise to obtain 1-β. Both compounds 1-α and 1-β can be used as heterogeneous catalysts to catalyze the selective oxidation of multitudinous sulfides with H2O2 as an oxidant. When the oxidation of methyl phenyl sulfide was used as the template reaction, the yield of methyl phenyl sulfoxide is close to 100% within 30 min by 1-α and 1-β and the oxidant utilization efficiency is more than 93%. Gratifying catalytic effects have also been achieved in the selective oxidation of phenyl and aliphatic sulfide derivatives. Simultaneously, both 1-α and 1-β showed an extraordinary degradation efficiency of 2-chloroethyl ethyl sulfide and have a half lifetime (t1/2) approximately 2.5 or 3 min, respectively, with 100% selectivity toward the nontoxic product 2-chloroethyl ethyl sulfoxide and an abnormally high oxidant utilization efficiency (94.5% for 1-α and 94.3% for 1-β) at room temperature. In addition, after seven cycles and continuous cycle catalytic experiments, their structures remained and catalytic activities did not decrease obviously, revealing their outstanding recyclability and structural stability

Facile and Equipment-Free Data Encryption and Decryption by Self-Encrypting Pt(II) Complex

Luminescence switching materials are vital to various data security-related techniques, including data encryption–decryption. Here, we report a family of pseudopolymorphs based on a diimine–platinum­(II) complex, Pt­(Me3SiCCbpyCCSiMe3)­(CCC6H4Br-3)2 (1), and systematically studied the influence of stacking modes on luminescence switching behaviors. Upon exposure to heat or tetrahydrofuran vapor, these pseudopolymorphs exhibit unusual stacking mode-intervened luminescence switching (SMILS) property that non-columnar and quasi-columnar pseudopolymorphs undergo single- and multi-step conversion processes, respectively, to the same non-columnar products. Systematic studies revealed that the unique SMILS behavior is caused by the existence of stable intermediate products as well as different conversion processes of pseudopolymorphs with distinct stacking modes. Such a new property leads to the self-encryption function of 1, which is very important for improving the existing data encryption–decryption technique. On this basis, we developed a facile, reusable, equipment-free technique with 1 as the only starting material and realized data encryption–decryption successfully

Facile and Equipment-Free Data Encryption and Decryption by Self-Encrypting Pt(II) Complex

Luminescence switching materials are vital to various data security-related techniques, including data encryption–decryption. Here, we report a family of pseudopolymorphs based on a diimine–platinum­(II) complex, Pt­(Me3SiCCbpyCCSiMe3)­(CCC6H4Br-3)2 (1), and systematically studied the influence of stacking modes on luminescence switching behaviors. Upon exposure to heat or tetrahydrofuran vapor, these pseudopolymorphs exhibit unusual stacking mode-intervened luminescence switching (SMILS) property that non-columnar and quasi-columnar pseudopolymorphs undergo single- and multi-step conversion processes, respectively, to the same non-columnar products. Systematic studies revealed that the unique SMILS behavior is caused by the existence of stable intermediate products as well as different conversion processes of pseudopolymorphs with distinct stacking modes. Such a new property leads to the self-encryption function of 1, which is very important for improving the existing data encryption–decryption technique. On this basis, we developed a facile, reusable, equipment-free technique with 1 as the only starting material and realized data encryption–decryption successfully

Two Polymorphic Polyoxometalate-Based Metal–Organic Frameworks for the Efficient Synthesis of Functionalized Sulfoxides and Detoxification of Mustard Gas Simulants

The development of high-efficient catalysts for the oxidation reaction of sulfides received much attention in recent years due to the extensive applications of such reactions from the utility in pharmaceutical chemistry and biology to the detoxification of chemical warfare agents in war. Herein, we report two innovative polyoxometalate-based metal–organic frameworks (POMOFs) {[ε-PMo8VMo4VIO37(OH)3]­[Zn2(C10N2H8)­(H2O)2]2}2·8H2O (1-α and 1-β), which were characterized by elemental analysis, UV–vis diffuse reflectance spectroscopy, X-ray single-crystal and powder diffraction, X-ray photoelectron spectroscopy, and Fourier-transform infrared spectroscopy techniques in detail. Single-crystal X-ray diffraction analysis indicates that 1-α and 1-β are polymorphic with the identical compositions and analogical structures. Compounds 1-α and 1-β are both connected by Zn4-ε-Keggin polyoxoanions and 4,4′-bipyridine (bpy) ligands to form twofold interpenetrated three-dimensional POMOF structures. 1-β can be seen as a rotational polymorph of 1-α, that is, 1-α takes the b axis as the rotation axis and rotates ∼39° clockwise to obtain 1-β. Both compounds 1-α and 1-β can be used as heterogeneous catalysts to catalyze the selective oxidation of multitudinous sulfides with H2O2 as an oxidant. When the oxidation of methyl phenyl sulfide was used as the template reaction, the yield of methyl phenyl sulfoxide is close to 100% within 30 min by 1-α and 1-β and the oxidant utilization efficiency is more than 93%. Gratifying catalytic effects have also been achieved in the selective oxidation of phenyl and aliphatic sulfide derivatives. Simultaneously, both 1-α and 1-β showed an extraordinary degradation efficiency of 2-chloroethyl ethyl sulfide and have a half lifetime (t1/2) approximately 2.5 or 3 min, respectively, with 100% selectivity toward the nontoxic product 2-chloroethyl ethyl sulfoxide and an abnormally high oxidant utilization efficiency (94.5% for 1-α and 94.3% for 1-β) at room temperature. In addition, after seven cycles and continuous cycle catalytic experiments, their structures remained and catalytic activities did not decrease obviously, revealing their outstanding recyclability and structural stability

Facile and Equipment-Free Data Encryption and Decryption by Self-Encrypting Pt(II) Complex

Luminescence switching materials are vital to various data security-related techniques, including data encryption–decryption. Here, we report a family of pseudopolymorphs based on a diimine–platinum­(II) complex, Pt­(Me3SiCCbpyCCSiMe3)­(CCC6H4Br-3)2 (1), and systematically studied the influence of stacking modes on luminescence switching behaviors. Upon exposure to heat or tetrahydrofuran vapor, these pseudopolymorphs exhibit unusual stacking mode-intervened luminescence switching (SMILS) property that non-columnar and quasi-columnar pseudopolymorphs undergo single- and multi-step conversion processes, respectively, to the same non-columnar products. Systematic studies revealed that the unique SMILS behavior is caused by the existence of stable intermediate products as well as different conversion processes of pseudopolymorphs with distinct stacking modes. Such a new property leads to the self-encryption function of 1, which is very important for improving the existing data encryption–decryption technique. On this basis, we developed a facile, reusable, equipment-free technique with 1 as the only starting material and realized data encryption–decryption successfully

Facile and Equipment-Free Data Encryption and Decryption by Self-Encrypting Pt(II) Complex

Luminescence switching materials are vital to various data security-related techniques, including data encryption–decryption. Here, we report a family of pseudopolymorphs based on a diimine–platinum­(II) complex, Pt­(Me3SiCCbpyCCSiMe3)­(CCC6H4Br-3)2 (1), and systematically studied the influence of stacking modes on luminescence switching behaviors. Upon exposure to heat or tetrahydrofuran vapor, these pseudopolymorphs exhibit unusual stacking mode-intervened luminescence switching (SMILS) property that non-columnar and quasi-columnar pseudopolymorphs undergo single- and multi-step conversion processes, respectively, to the same non-columnar products. Systematic studies revealed that the unique SMILS behavior is caused by the existence of stable intermediate products as well as different conversion processes of pseudopolymorphs with distinct stacking modes. Such a new property leads to the self-encryption function of 1, which is very important for improving the existing data encryption–decryption technique. On this basis, we developed a facile, reusable, equipment-free technique with 1 as the only starting material and realized data encryption–decryption successfully