Electronic impact of ancillary ligand on the oxygenation profile of ruthenium coordinated β-diketiminate

Polyhedron ◽  
2019 ◽  
Vol 172 ◽  
pp. 45-57 ◽  
Author(s):  
Sanjib Panda ◽  
Sudip Kumar Bera ◽  
Goutam Kumar Lahiri
Keyword(s):  
Ancillary Ligand ◽  
Electronic Impact

Imine as a Linchpin Approach for Distal C(sp2)–H Functionalization

2020 ◽  
Author(s):  
Sukdev Bag ◽  
Sadhan Jana ◽  
Sukumar Pradhan ◽  
Suman Bhowmick ◽  
Nupur Goswami ◽  
...  
Keyword(s):  
Organic Molecules ◽  
Bond Activation ◽  
Bond Formation ◽  
Ancillary Ligand ◽  
Significant Challenge ◽  
Site Selectivity ◽  
Directing Group ◽  
Covalently Linked ◽  
Complex Organic ◽  
Post Functionalization

<p>Despite the widespread applications of C–H functionalization, controlling site selectivity remains a significant challenge. Covalently attached directing group (DG) served as an ancillary ligand to ensure proximal <i>ortho</i>-, distal <i>meta</i>- and <i>para</i>-C-H functionalization over the last two decades. These covalently linked DGs necessitate two extra steps for a single C–H functionalization: introduction of DG prior to C–H activation and removal of DG post-functionalization. We introduce here a transient directing group for distal C(<i>sp<sup>2</sup></i>)-H functionalization <i>via</i> reversible imine formation. By overruling facile proximal C-H bond activation by imine-<i>N</i> atom, a suitably designed pyrimidine-based transient directing group (TDG) successfully delivered selective distal C-C bond formation. Application of this transient directing group strategy for streamlining the synthesis of complex organic molecules without any necessary pre-functionalization at the distal position has been explored.</p>

Site-Specific Protein Covalent Attachment to Nanotubes and Its Electronic Impact on Single Molecule Function

2019 ◽  
Author(s):  
Adam Beachey ◽  
Harley Worthy ◽  
William David Jamieson ◽  
Suzanne Thomas ◽  
Benjamin Bowen ◽  
...  
Keyword(s):  
Single Molecule ◽  
Fluorescent Protein ◽  
Functional Integration ◽  
Attachment Site ◽  
Covalent Attachment ◽  
Great Promise ◽  
Functional Coupling ◽  
Phenyl Azide ◽  
Electronic Impact ◽  
Protein Attachment

<p>Functional integration of proteins with carbon-based nanomaterials such as nanotubes holds great promise in emerging electronic and optoelectronic applications. Control over protein attachment poses a major challenge for consistent and useful device fabrication, especially when utilizing single/few molecule properties. Here, we exploit genetically encoded phenyl azide photochemistry to define the direct covalent attachment of three different proteins, including the fluorescent protein GFP, to carbon nanotube side walls. Single molecule fluorescence revealed that on attachment to SWCNTs GFP’s fluorescence changed in terms of intensity and improved resistance to photobleaching; essentially GFP is fluorescent for much longer on attachment. The site of attachment proved important in terms of electronic impact on GFP function, with the attachment site furthest from the functional center having the larger effect on fluorescence. Our approach provides a versatile and general method for generating intimate protein-CNT hybrid bioconjugates. It can be potentially applied easily to any protein of choice; attachment position and thus interface characteristics with the CNT can easily be changed by simply placing the phenyl azide chemistry at different residues by gene mutagenesis. Thus, our approach will allow consistent construction and modulate functional coupling through changing the protein attachment position.</p>

Structural and electronic impact of SrTiO3 substrate on TiO2 thin films

2012 ◽  
Vol 47 (13) ◽  
pp. 5148-5157 ◽  
Author(s):  
Zhongchang Wang ◽  
Rong Sun ◽  
Chunlin Chen ◽  
Mitsuhiro Saito ◽  
Susumu Tsukimoto ◽  
...  
Keyword(s):  
Thin Films ◽  
Tio2 Thin Films ◽  
Srtio3 Substrate ◽  
Electronic Impact

Copper(I)−Olefin Complexes: The Effect of the Trispyrazolylborate Ancillary Ligand in Structure and Reactivity

2010 ◽  
Vol 29 (16) ◽  
pp. 3481-3489 ◽  
Author(s):  
Carmen Martín ◽  
José María Muñoz-Molina ◽  
Abel Locati ◽  
Eleuterio Alvarez ◽  
Feliu Maseras ◽  
...  
Keyword(s):  
Ancillary Ligand

Ancillary Ligand Effect on Single-Site Styrene Polymerization:  Isospecificity of Group 4 Metal Bis(phenolate) Catalysts

2003 ◽  
Vol 125 (17) ◽  
pp. 4964-4965 ◽  
Author(s):  
Carmine Capacchione ◽  
Antonio Proto ◽  
Henner Ebeling ◽  
Rolf Mülhaupt ◽  
Klaus Möller ◽  
...  
Keyword(s):  
Single Site ◽  
Ancillary Ligand ◽  
Ligand Effect ◽  
Styrene Polymerization ◽  
Group 4 ◽  
Group 4 Metal
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