Concentration, temperature and/or solvent polarity control the speciation on the metal-directed self-assembly of a ditopic pyridyl ligand L with cis-protected Pd(ii) metal centers. This results into a controllable dynamic system, involving a [Pd2L2](6+) metallacycle and a [Pd4L4](12+) ring-in-ring complex.
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Recent advances in peptide macrocyclization strategies.
Chem Soc Rev
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Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong SAR, P. R. China.
Recently, owing to their special spatial structures, peptide-based macrocycles have shown tremendous promise and aroused great interest in multidisciplinary research ranging from potent antibiotics against resistant strains to functional biomaterials with novel properties. Besides traditional monocyclic peptides, many fascinating polycyclic and remarkable higher-order cyclic, spherical and cylindric peptidic systems have come into the limelight owing to breakthroughs in various chemical (, native chemical ligation and transition metal catalysis), biological (, post-translational enzymatic modification and genetic code reprogramming), and supramolecular (, mechanically interlocked, metal-directed folding and self-assembly noncovalent interactions) macrocyclization strategies developed in recent decades. In this tutorial review, diverse state-of-the-art macrocyclization methodologies and techniques for peptides and peptidomimetics are surveyed and discussed, with insights into their practical advantages and intrinsic limitations.
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Inorg Chem
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Department of Applied Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Square-like metallamacrocyclic palladium(II) complexes [] () were synthesized by reacting aromatic dipyrazole ligands (HL-HL with pyromellitic arylimide-, 1,4,5,8-naphthalenetetracarboxylic arylimide-, and anthracene-based aromatic groups, respectively) with dipalladium corners ([(bpy)Pd(NO)](NO), [(dmbpy)Pd(NO)](NO), or [(phen)Pd(NO)](NO), where bpy = 2,2'-bipyridine, dmbpy = 4,4'-dimethyl-2,2'-bipyridine, and phen = 1,10-phenanthroline) in aqueous solutions via metal-directed self-assembly. Metallamacrocycles were fully characterized by H and C nuclear magnetic resonance spectroscopy and electrospray ionization mass spectrometry, and the square structure of 8NO was further confirmed via single crystal X-ray diffraction. These square-like metallamacrocycles exhibit effective performance for iodine adsorption.
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Center of Excellence for Environmental Safety and Biological Effects, Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry and Biology, School of Life Science and Chemistry, Faculty of Environment and Life, Beijing University of Technology, Beijing, 100124, China.
Owing to their structural designability and tuneable properties, supramolecular metal-organic complexes have recently emerged as promising candidates for the sensing and detection of molecules and anions. Herein, we synthesised three tripyrazolate-linked [ML] metallocages with the formulas [(bpyPd)L](NO) (1), [(dmbpyPd)L](NO) (2), and [(phenPd)L](NO) (3) (HL = tris(4-(5-(trifluoromethyl)-1-pyrazol-3-yl)phenyl)amine, bpy = 2,2'-bipyridine, dmbpy = 4,4'-dimethylbipyridine, phen = 1,10-phenanthroline). Crystallography revealed that metal-directed coordination and the bidentate chelate behaviour of the ligand induced the self-assembly of supramolecular metal-organic cages.
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