A novel approach to solubilize single-walled carbon nanotubes (SWCNTs) in the aqueous phase is described by employing supramolecular surface modification. We use cyclodextrin complexes of synthetic molecules that contain a planar pyrene moiety or a bent, shape-fitted triptycene moiety as a binding group connected through a spacer to an adamantane moiety that is accommodated in the cyclodextrin cavity. The binding groups attach to the sidewalls of SWCNTs through a pi-pi stacking interaction to yield a supramolecular system that allows the SWCNTs to dissolve in the aqueous phase through the formed hydrophilic cyclodextrin shell. The black aqueous SWCNT solutions obtained are stable over a period of months. They are characterized through absorbance, static, and time-resolved fluorescence spectroscopy as well as Raman spectroscopy, TEM, and fluorescence-decay measurements. Furthermore, the shape-fitted triptycene-based system shows a pronounced selectivity for SWCNTs with a diameter of 1.0 nm.

The synthesis and characterization of the µ-Cl-bridged dinuclear complex [CuLCl] 2 with the new Schiff-base ligand HL, 2-methyl-6-[(pyridine-2-ylmethylene)amino]phenol, is reported. The structural study shows the complex has the unusual distorted trigonal-bipyramidal geometry. Variable temperature susceptibility measurements in the range of 2.0-300 K reveal a novel ferromagnetic coupling, 2J = 1.52 cm -1 .

No abstract

No abstract

The preparation, crystal structure, and magnetic properties of the µ-Cl-bridged dinuclear complex [Mn(HL)(µ-Cl)Cl] 2 (1) with the Schiff-base ligand HL, 2-methyl-6-[(pyridine-2-ylmethylene)amino]phenol, is reported. Structural studies show that 1 is binuclear with a pair of chlorine atoms bridging the manganese atoms in a central Mn 2 Cl 2 plane, the intramolecular Mn···Mn separation being 3.694 Å. Each manganese atom in 1 is six-coordinate with two nitrogen atoms (one imine nitrogen and one pyridine nitrogen) and one phenolic oxygen from the neutral tridentate ligand, and three chlorine atoms (one terminal and two bridging) building an elongated octahedral environment. The two octahedra adopt the unique geometry sharing an equatorial-to-axial edge with parallel equatorial planes. The hydrogen bonds be-