Tin-oxychalcogenide supertetrahedral clusters maintained in a MTN zeolite-analog arrangement by coulombic interactions

Reported are two tin-oxychalcogenides, composed of discrete T3-like [Sn10O8X16]8− (X = S/Se), which are arrayed in an MTN zeotype by electrostatic interactions with protonated amines.

Structures and dyeing performances of polyethyleneimine-carbamate linked bamboo viscose fibers dyed with lac

Polyethyleneimine (PEI)-immobilization of bamboo viscose fibers using carbamate linkages (ABF-PEI) was investigated in order to improve the dyeing properties of the fiber. Results from morphological observation, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and thermogravimetric analysis clearly showed the successful carbamate binding of PEI at hydroxyl groups of cellulose fiber. The adsorption studies revealed that fast and efficient adsorption was achieved for ABF-PEI. Under optimum dyeing conditions, the amount of dye adsorbed on ABF-PEI at equilibrium (>100 mg/g) was much higher than that of the unmodified fiber (<10 mg/g). The adsorption behavior of lac dyeing on the PEI-modified bamboo viscose fibers could be described by the pseudo-second-order kinetics and Langmuir isotherm. The proposed mechanism mainly involved the electrostatic ion–dipole interaction between protonated amines of PEI and negative charged sites of lac dye. The color fastness results indicated good resistance of color changes for ABF-PEI, suggesting efficiency of the surface modifying method of PEI-immobilization on bamboo viscose fibers.

Gas-phase reactions of cyclopropenylidene with protonated alkyl amines

Reactions of c-C3H2 with protonated amines are driven by its high gas-phase basicity, forming proton-bound dimer as the first step.

Synthesis, structure and optical properties of two novel luminescent polar dysprosium metal–organic frameworks: [(CH3)2NH2][Dy(HCOO)4] and [N2H5][Dy(HCOO)4]

We report the structures and optical properties of two novel dysprosium formates templated by protonated amines.