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928342-01-2

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928342-01-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 928342-01-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,2,8,3,4 and 2 respectively; the second part has 2 digits, 0 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 928342-01:
(8*9)+(7*2)+(6*8)+(5*3)+(4*4)+(3*2)+(2*0)+(1*1)=172
172 % 10 = 2
So 928342-01-2 is a valid CAS Registry Number.

928342-01-2Downstream Products

928342-01-2Relevant articles and documents

Effect of core twisting on self-assembly and optical properties of perylene bisimide dyes in solution and columnar liquid crystalline phases

Chen, Zhijian,Baumeister, Ute,Tschierske, Carsten,Wuerthner, Frank

, p. 450 - 465 (2007)

A series of highly soluble and fluorescent core-twisted perylene bisimide dyes (PBIs) 3a-f with different substituents at the bay area (1,6,7,12 positions of the perylene core) were synthesized and fully characterized by 1H NMR, UV/Vis spectroscopy, MS spectrometry, and elemental analysis. The π-π aggregation properties of these new functional dyes were investigated in detail both in solution and in condensed phase by UV/Vis and fluorescence spectroscopy, vapor pressure osmometry (VPO), differential scanning calorimetry (DSC), polarizing optical microscopy (POM), and X-ray diffraction. Concentration-dependent UV/ Vis measurements and VPO analysis revealed that these core-twisted π-conjugated systems show distinct self-dimerization equilibria in apolar solvent methylcyclohexane (MCH) with dimerization constants between 1.3 × 104 and 30 M-1. The photoluminescence spectra of the dimers of PBIs 3a-f exhibit bathochromic shifts of quite different magnitude which could be attributed to different longitudinal or rotational offsets between the dyes as well as differ ences in the respective π-π stacking distance. In condensed state, quite a few of these PBIs form luminescent rectangular or hexagonal columnar liquid crystalline phases with low isotropization temperatures. The effects of the distortion of the π systems on their π-π stacking and the optical properties of the resultant stacks in solution and in LC phases have been explored in detail. In one case (3a) a particularly interesting phase change from crystalline into liquid crystalline could be observed upon annealing that was accompanied by a transformation from non-fluorescent H-type into strongly fluorescent J-type packing of the dyes.

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