| 1. |
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- 2019
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Tidskriftsartikel (refereegranskat)
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| 2. |
- Green, Joshua P., et al.
(författare)
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Effect of Arsenic Coordination State on the Structure, Aromaticity, and Optical Properties of Dithieno[3,2-b:2 ',3 '-d]arsoles
- 2019
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Ingår i: European Journal of Inorganic Chemistry. - : Wiley. - 1434-1948 .- 1099-1948 .- 1099-0682. ; :11-12, s. 1539-1543
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Tidskriftsartikel (refereegranskat)abstract
- A silylated derivative of 4-phenyl-dithieno[3,2-b:2 ',3 '-d]arsole (DTAs) was synthesized, and the effect of coordinating of DTAs compounds to Pd on their structural and optical properties was investigated. Coordination of the As to Pd was found to increase the structural aromaticity of the ring system as measured by the harmonic oscillator measure of heterocyclic electron delocalization (HOMHED), and the pyramidalization of the As atoms was also found to show a good correlation with the HOMHED values. However, coordination had a more subtle impact on the optical properties than seen for phosphorus-containing analogues as the metal-ligand interactions were weaker.
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| 3. |
- Gupta, Arvind Kumar, et al.
(författare)
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Facile synthesis of silver alkynide cluster and coordination polymers using picolinic acid as a co-ligand
- 2019
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Ingår i: Dalton Transactions. - : ROYAL SOC CHEMISTRY. - 1477-9226 .- 1477-9234. ; 48:44, s. 16518-16524
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Tidskriftsartikel (refereegranskat)abstract
- We describe five 1D-coordination polymers and two discrete silver clusters consisting of alkynides and picolinic carboxylates as co-ligands. In some cases, DMSO or EtOH further solvated the structural motifs. Utilising the sterically demanding tri-isopropylsilyl acetylene afforded a tridecanuclear cluster that possessed an unprecedented core with a silver center surrounded by six octahedrally arranged silver atoms.
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| 4. |
- Gupta, Arvind Kumar, et al.
(författare)
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Rearrangement and redistribution reaction of Ph2PCH2TMS with PhAsCl2 or AsCl3
- 2019
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Ingår i: Phosphorus Sulfur and Silicon and the Related Elements. - : TAYLOR & FRANCIS LTD. - 1042-6507 .- 1563-5325. ; 194:10, s. 967-971
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Tidskriftsartikel (refereegranskat)abstract
- The attempted synthesis of bis(diphenylphosphinomethyl) phenylarsane and tris(diphenylphosphinomethyl) arsane through condensation of chloro arsanes and diphenyl (trimethylsilylmethyl) phosphane yielded a number of side products originating from migratory and redox-reactions in addition to the targeted ligands. An unexpected, 1,3,4-phosphadiarssolan-1-ium salt was obtained and crystallographically characterized as an A-shaped chlorido adduct. [GRAPHICS] .
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| 5. |
- Gupta, Arvind Kumar, et al.
(författare)
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Solvent and Counter-Ion Induced Coordination Environment Changes Towards Ag-I Coordination Polymers
- 2019
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Ingår i: European Journal of Inorganic Chemistry. - : WILEY-V C H VERLAG GMBH. - 1434-1948 .- 1099-1948 .- 1099-0682. ; 2019:33, s. 3740-3744
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Tidskriftsartikel (refereegranskat)abstract
- A series of silver coordination polymers based on the 9,9 '-bis(4,5-diazafluorene) (BDF-H-2) ligand is presented. The choice of counterions and reaction conditions dictate the observed topology on the final systems by influencing the silver coordination environment. Coordination modes, flexibility of the ligand and extended pi-pi stacking interactions have allowed the preparation and crystallographic characterisation of one 1D- and three 2D-coordination polymers: 1D-[Ag(BDF-H-2)(DMSO)](n)(X)(n) (where X = OTf- and ClO4-); 1D-[Ag-2(BDF-H-2) m(1)-(TfO)(2),m(2)-(TfO)(2)](n)(TfO)(n), and 2D-[Ag-2(BDF-H-2)(3)](n)(PF6)(2n).
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| 6. |
- Gupta, Arvind Kumar, et al.
(författare)
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The Self-Assembly of [{Ag-3(C (CBu)-Bu-t)(2)}(n)](n+) Building Units into a Template-Free Cuboctahedron and Anion-Encapsulating Silver Cages
- 2019
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Ingår i: Inorganic Chemistry. - : AMER CHEMICAL SOC. - 0020-1669 .- 1520-510X. ; 58:23, s. 16236-16240
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Tidskriftsartikel (refereegranskat)abstract
- We describe the controlled synthesis of silver acetylide clusters based on a simple polymeric [Ag3L2](+) (L = -C (CBu)-Bu-t) building block. A linear one-dimensional polymeric structure shows alternating pyramidal motifs and is the basic repeating unit forming discrete molecular cages (pentamers [X subset of Ag15L10](4+) and hexamers [PF6 subset of Ag18L12](5+)) obtained by incorporating suitable templates. These motifs and a rare template-free cuboctahedral [Ag12L8](4+) cluster (tetramer) were crystallographically characterized.
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| 7. |
- Roy, Souvik, et al.
(författare)
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Electrocatalytic Hydrogen Evolution from a Cobaloxime-Based Metal-Organic Framework Thin Film
- 2019
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Ingår i: Journal of the American Chemical Society. - : American Chemical Society (ACS). - 0002-7863 .- 1520-5126. ; 141:40, s. 15942-15950
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Tidskriftsartikel (refereegranskat)abstract
- Molecular hydrogen evolution catalysts (HECs) are synthetically tunable and often exhibit high activity, but they are also hampered by stability concerns and practical limitations associated with their use in the homogeneous phase. Their incorporation as integral linker units in metal-organic frameworks (MOFs) can remedy these shortcomings. Moreover, the extended three-dimensional structure of MOFs gives rise to high catalyst loadings per geometric surface area. Herein, we report a new MOF that exclusively consists of cobaloximes, a widely studied HEC, that act as metallo-linkers between hexanuclear zirconium clusters. When grown on conducting substrates and under applied reductive potential, the cobaloxime linkers promote electron transport through the film as well as function as molecular HECs. The obtained turnover numbers are orders of magnitude higher than those of any other comparable cobaloxime system, and the molecular integrity of the cobaloxime catalysts is maintained for at least 18 h of electrocatalysis. Being one of the very few hydrogen evolving electrocatalytic MOFs based on a redox-active metallo-linker, this work explores uncharted terrain for greater catalyst pathways.
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| 8. |
- Vanderkooy, Alan, et al.
(författare)
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Halogen Bonding Helicates Encompassing Iodonium Cations
- 2019
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Ingår i: Angewandte Chemie International Edition. - : WILEY-V C H VERLAG GMBH. - 1433-7851 .- 1521-3773. ; 58:27, s. 9012-9016
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Tidskriftsartikel (refereegranskat)abstract
- The first halonium-ion-based helices were designed and synthesized using oligo-aryl/pyridylene-ethynylene backbones that fold around reactive iodonium ions. Halogen bonding interactions stabilize the iodonium ions within the helices. Remarkably, the distance between two iodonium ions within a helix is shorter than the sum of their van der Waals radii. The helical conformations were characterized by X-ray crystallography in the solid state, by NMR spectroscopy in solution and corroborated by DFT calculations. The helical complexes possess potential synthetic utility, as demonstrated by their ability to induce iodocyclization of 4-penten-1-ol.
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