摘要:
4,5-Bis(benzylthio)-1,3-dithiole-2-thiones, [(p-XC6H4CH2)(p-XC6H4CH2)dmit: X = Y = OMe (2); X = OMe, Y = NO2 (3); and X = NO2] (4)] have been prepared from benzyl chlorides and [NEt4](2)[Zn(dmit)(2)]. Isostructural compounds, 2 and 3, crystallize in the triclinic space group P (1) over bar (Z = 2) with a = 5.2920(10): b = 10.537(2), c = 18.961(4) Angstrom, alpha = 102.79(3), beta = 96.33(3), gamma = 98.67(3)degrees for 2; a = 5.292(8), b = 10.528(12), c = 19.01(2) Angstrom, alpha = 102.74(9), beta = 96.26(11), gamma = 98.56(11)degrees for 3. Compound 4 also crystallizes in the space group P (1) over bar (Z = 4), with a = 9.296(8), b = 13.993(18), c = 16.186(4) Angstrom, alpha = 106.68(3), beta = 89.63(3), gamma = 99.38(6)degrees. Molecular differences between 2 and 3, on one hand, and 4, on the other, arise in the disposition of the aryl rings relative to the dmit group. Short S---S contacts in 2 of 3.320(2) Angstrom [S3---S3(i) (symmetry operation: i: -x + 1, -y + 1, -z)] and in 3 of 3.314(5)Angstrom [S3---S3(i) (symmetry operation: i: -x + i, -y, -z + 1)1 link molecules into pairs. In 4, an S5A---S2B contact of 3.516(5) Angstrom links two independent molecules, A and B, into bimolecular units, which are further connected into chains by S2A---S5B(i) contacts (symmetry operation: i: x,y, z - 1) at 3.569(5) Angstrom. C-H---O hydrogen bonds are also present in 3 and 4.