2,2,3,3′-Tetraphenyl-7,7′-biquinoxaline

2,2,3,3′-Tetra­phenyl-7,7′-biquinoxaline

In the crystal structure of the title compound, C(40)H(26)N(4), mol-ecules reside on crystallographic centers of inversion and are linked via C-H⋯N inter-actions about inversion centers into one-dimensional chains: longer C-H⋯π(arene) inter-actions complete the inter-molecular inter-actions.

2233 Tear secretion in insulin-dependent diabetics

Purpose: The established methods for observing the morghnl-og;i nF the teer film a=~ based on ;nierfrrenc~ techniques. Since interference patterns are visible only in e pathologically thickened tear film, these techniques are not useful for the physiological tear film morphology. Methods: A ne;.approach is Brewster Angle Microscopy n-which allows the studv of ultra-thin films. In ophthalmology ...

FPGA designs of parallel high performance GF(2233) multipliers

For many applications from the areas of cryptography and coding, finite field multiplication is the most resource and time consuming operation. We have designed and optimized four high performance parallel GF (2) multipliers for an FPGA realization and analyzed the time and area complexities. One of the multipliers uses a new hybrid structure to implement the Karatsuba algorithm. For increasing...

4,4,9,9-Tetraphenyl pyrroloindolizine: a structural analogue of calix[2]pyrrole.

Synthesis, spectral and structural characterization of a pyrroloindolizine derivative having structural similarity with calix[2]pyrrole is described. Here, two pyrrole rings are connected with two meso-carbon atoms having an N,α-linkage and an α,β-linkage to afford the smallest analogue in the calixpyrrole family. Detailed NMR spectroscopic studies along with single crystal X-ray analysis confi...

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