Recent Advances in Bioorthogonal Click Chemistry for Efficient Synthesis of Radiotracers and Radiopharmaceuticals.

In recent years, several catalyst-free site-specific reactions have been investigated for the efficient conjugation of biomolecules, nanomaterials, and living cells. Representative functional group pairs for these reactions include the following: (1) azide and cyclooctyne for strain-promoted cycloaddition reaction, (2) tetrazine and trans-alkene for inverse-electron-demand-Diels-Alder reaction, and (3) electrophilic heterocycles and cysteine for rapid condensation/addition reaction. Due to their excellent specificities and high reaction rates, these conjugation methods have been utilized for the labeling of radioisotopes (e.

Crystal structure of 2,3-bis-(4-methyl-phen-yl)benzo[]quinoxaline.

The title compound, CHN, was obtained during a search for new π-extended ligands with the potential to generate efficient phosphors with iridium(III) for organic light-emitting devices (OLEDs). The benzoquinoxaline ring system is almost planar (r.m.

Radiolabeling and preliminary biodistribution study of Tc-labeled antibody-mimetic scaffold protein repebody for initial clearance properties.

Antibody-mimetic proteins are intensively being developed for biomedical applications including tumor imaging and therapy. Among them, repebody is a new class of protein that consists of highly diverse leucine-rich repeat (LRR) modules. Although all possible biomedical applications with repebody are ongoing, it's in vivo biodistribution and excretion pathway has not yet been explored.

Efficient bioremediation of radioactive iodine using biogenic gold nanomaterial-containing radiation-resistant bacterium, Deinococcus radiodurans R1.

We herein report a new bioremediation method using a radiation-resistant bacterium. Biogenic gold nanomaterial-containing Deinococcus radiodurans R1 showed excellent capability for the removal of radioactive iodine (>99%) in several aqueous solutions. These observations demonstrated that our remediation system would be efficiently applied to the treatment of radioactive wastes.

Gold-Nanoparticle-Immobilized Desalting Columns for Highly Efficient and Specific Removal of Radioactive Iodine in Aqueous Media.

There has been worldwide attention on the efficient removal of radioactive iodine, because it is commonly released in nuclear plant accidents. Increasing concerns on environmental problems due to the radioactive iodine are leading us to develop stable and sustainable technology for remediation of radioelement contaminants. In this work, we report a highly efficient chromatographic method for specific and rapid capture of radioactive iodine.

Highly efficient method for I-radiolabeling of biomolecules using inverse-electron-demand Diels-Alder reaction.

In this report, we present a rapid and highly efficient method for radioactive iodine labeling of trans-cyclooctene group conjugated biomolecules using inverse-electron-demand Diels-Alder reaction. Radioiodination reaction of the tetrazine structure was carried out using the stannylated precursor 2 to give I-labeled product ([I]1) with high radiochemical yield (65±8%) and radiochemical purity (>99%). For radiolabeling application of [I]1, trans-cyclooctene derived cRGD peptide and human serum albumin were prepared.

Bis[2-(1,3-benzo-thia-zol-2-yl)phenyl-κ(2) C (1),N][1,3-bis-(4-bromo-phen-yl)propane-1,3-dionato-κ(2) O,O']iridium(III).

The title complex, [Ir(C15H9Br2O2)(C13H8NS)2], lies about a crystallographic twofold rotation axis passing through the Ir(III) atom and the central C atom of the bis-(bromo-phen-yl)propane-1,3-dionate ligand. The Ir(III) atom adopts a distorted octa-hedral geometry coordinated by two N atoms in the axial positions, and two C and two O atoms in the equatorial plane. The dihedral angle between the two thia-zole ring systems in the complex is 77.

Bis[3,5-difluoro-2-(4-methyl-pyridin-2-yl)phenyl-κC,N](picolinato-κN,O)iridium(III) chloro-form monosolvate.

In the title complex, [Ir(C(12)H(8)F(2)N)(2)(C(6)H(4)NO(2))]·CHCl(3), two similar mol-ecules of each component comprise the asymmetric unit. The independent complex mol-ecules are linked by inter-molecular π-π inter-actions [centroid-centroid distance = 3.830 (4) Å].

Di-μ-chlorido-bis-{[2-(benzyl-imino-meth-yl)pyridine-κN,N']chloridomercury(II)} dichloridomercury(II).

The Hg(II) ion in the title centrosymmetric dinuclear complex, [Hg(2)Cl(4)(C(13)H(12)N(2))(2)]·[HgCl(2)], adopts a distorted square-pyramidal geometry, being coordinated by the bis-chelating N-heterocyclic ligand, two bridging Cl atoms and one terminal Cl atom. One of the bridging Hg-Cl bonds [2.8428 (11) Å] is significantly longer than the other [2.