Comp R Mole. formula      M.W M.P. (oC)    Yield (%) IIa Bi-Ph            C21H15N3OS2 389 240-242       60 IIb o-HO-Ph            C15H11N3O2S2 329 125-126       57 IIc p-Cl-Ph           C15H10ClN3OS2 347 240-241       60 Iid p-Br-Ph            C15H10BrN3OS2 392 139-140       59 Iie Chromen C18H11N3O3S2 381 130-131       67 Iif  p-CH3-Ph           C16H13N3OS2 327 100-101       55 Iig p-OCH3-Ph        C16H13N3O2S2 343  97-98 70 Iih p-NH2-Ph         C15H12N4OS2 328 180-181      53 Iii m-NH2-Ph         C15H12N4OS2 328 160-161       72 Iij p-OH-Ph          C15H11N3O2S2 329 90-91        50 Iik Ph C15H11N3OS2 313 137-138       78 Iil p-NO2-Ph         C15H10N4O3S2 358 120-121       72 Iim m-NO2-Ph         C15H10N4O3S2 358 132-133       45

Table 1: Physicochemical characterization of N-(4-(aryl)-2-thioxo-1,3-thiazol-3(2H)-yl)pyridine-4-carboxamide. (II).