Bis[5-(pyridin-2-yl-κN)tetra-zolido-κN (1)]copper(II).

In the title complex, [Cu(C6H4N5)2], the Cu(II) ion lies on an inversion center and is coordinated by two chelating 5-(pyridin-2-yl)tetra-zolide ligands in a slightly distorted square-planar coordination geometry. In the crystal, π-π stacking inter-actions, with centroid-centroid distances in the range 3.4301 (14)-3.

[Identification and classification of textiles based on terahertz time domain spectroscopy].

A method to discriminate textiles was proposed based on terahertz time-domain spectroscopy (THz-TDS) and clustering analysis, and some typical cotton textiles were investigated to prove its feasibility. Their time domain waveforms were measured using THz-TDS system and then their absorption spectra were obtained. Principal component analysis (PCA) was applied to extract features of the data, and then Mahalanobis distance discriminant method was employed to classify these materials.