Eigh teen novel 2-(1-aryl-5-methyl-1,2,3-triazol-4-yl)-1,3,4-oxadiazole de riv a tives and two acyl hy-drazone in ter me di ate com pounds were syn the sized by var i ous path ways start ing from 1-aryl-5-methyl-1,2,3-triazol-4-formhydrazide (1). All prod ucts were iden ti fied by spec tro scopic anal y sis, and 2-(1-aryl-5-methyl-1,2,3-triazol-4-yl)-5-benzalthio-1,3,4-oxadiazole was fur ther val i dated by X-ray crys tal log ra phy. Re-sults from pri mary an ti bac te rial ac tiv ity tests in di cated that most of the com pounds were ef fec tive against E. coli, P. aeruginosa, B. subtilis and S. aureus.

The prep a ra tion and char ac ter iza tion of some dipositive metal ion com plexes de rived from po tas sium 3-(pyridine-4-carbonylmethyl)-dithiocarbazate (PCDHK) are re ported. The solid com plexes of the com po si-tion ML

The E and Z-iso mers of the ti tled com pound were syn the sized by con den sa tion of 2-carboxaldehyde- 8-alkyloxyquinoline and N-cyanomethylcarbazole, fol lowed by hy dro ly sis. The alkoxy pro tec tion groups in 3b-c can be cleaved ei ther in acid or in base to yield 3a. All com pounds ex hibit blue/green lu mi nes cence, which may be used as emit ting ma te rials in the fab ri ca tion of light-emitting di odes. Crys tal dif frac tion anal y-ses were per formed for 3a-E, 3d-Z, and 4-Z, while the re sults in di cated the pres ence of a com mon struc tural fea ture among these mol e cules. The rings of quinoline are co-planar with the dou ble bond of crylonitrile, form ing a ma jor con ju gated chromo phore. The carbazole group is twisted along the N(9)-C(2) bond away from the ma jor plane with a large di hed ral an gle. The ma jor con ju gated chromphore was found to be re spon si-ble for the spec tral prop er ties of these com pounds. Protonation of the quinoline in these com pounds redshiftedtheir ab sorp tion bands sub stan tially.

Com pounds 2-arylamino-5-cinchophenyl-1,3,4-oxadiazoline (7) and 3-thio-4-amino-5-cinchophenyl- 1,2,4-triazole (3) have been syn the sized uti liz ing cinchophen as the start ing ma te rial. The com pound 3-cinchopheny-s-triazolo[3,4-b]-1,2,3,4-thiatriazole (4) was pre pared from com pound 3. Con den sa tion of 3 with ar o matic acid in the pres ence of POCl3 gave 10 new 6-aryl-3-cinchopheny-1,2,4-triazolo[3,4-b]-1,3,4-thiadiazoles (5). Some of the rep re sen ta tive com pounds were screened for an ti bac te rial ac tiv ity. The struc-tures of these new com pounds have been con firmed by means of el e men tal anal y sis, IR, 1H NMR and MS.

Polyethylene glycol (PEG, average molecular weight 400) was used as an absorbent for NO2, the absorptivity was found to reach up to 97%. PEG