The 1H-NMR spectrum (Table-1) of 1 afforded four signals in the aromatic region at I' 7.33 (2H, d, J = 8.4 Hz), 7.32 (2H, d, J = 8.4 Hz), 7.10 (2H, d, J = 8.4 Hz) and 7.08 (2H, d, J = 8.4 Hz), which depicted two p-substituted benzene rings in the molecule.

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The IR (KBr disk) spectrum showed broad vibration at 3254 [cm.sup.-1] due to the presence of the hydroxyl group, sharp absorption at 2933 [cm.sup.-1] due to the saturated group, sharp absorption at 1599 [cm.sup.-1] attributed to the aromatic benzene ring, strong absorption band at 2275 [cm.sup.-1] due to the saturated group C-H stretching, and strong absorption band at 1132 [cm.sup.-1] due to C-O stretching.

And compare two diamines; TPER polyimides have ether bond between the benzene rings, which are a weakness to thermal stability, so their weight loss temperatures are lower.

In the variation of the auxiliary ligand with the unchanging polypyridyl functional group, any increase in frequency of the imidazole ring stretch can be attributed to an increase of electron density available across the conduit and thus resulting in a concomitant increase in electronic density/conjugation of the terminal substituted benzene ring. Thus, an increase in frequency results in a decrease in yield, and the increased electron density facilitated greater vibrational coherence.

We inferred that the signal of [[delta].sub.H] 7.37 (2H, s) belongs to amino-H, which may be connected to a benzene ring or double bonds, and the signal of [[delta].sub.H] 7.37 (1H, d, J = 6.5) belongs to ribose terminal group H.

The result is the confirmation that the N[O.sub.2] groups of orthodinitrobenzene do not lie in the plane of the benzene ring. A previous report stated that the N[O.sub.2] groups are not planar for the orthoisomer [17] but this has been corrected by Tomkinson [18].

The following December, the Chemical Service Section was authorized a distinctive insignia--a benzene ring superimposed in the center of crossed retorts, which was widely considered appropriate and representative of the chemical mission.

At [delta] = 6.97 and [delta] = 6.99 a binary peak from the CH (C-1) group of the benzene ring can be seen that has coupling constant equal to 8Hz.

"And the benzene ring is the basis of all organic life - without it there would be no life at all.

'Simply put, chemically, triclosan structure consists of a dichlorobenzene ring attached to oxygen, which is attached to another benzene ring with a chloro and hydroxide ion attached.

The presence/absence of the benzene ring CH stretching vibration is a reliable probe for the perpendicular/parallel orientation, respectively, of the benzene ring with respect to the surface [37, 41].