Structures of di-p-tolyl terephthalate (C22H18O4) and 1,4-phenylene di-p-toluate (C22H18O4)

Effects of alkylthio groups on phase transitions of organic molecules and liquid crystals: a comparative study with alkyl and alkoxy groups

“…The relatively similar half-shifted packing manner and hydrogen bond contacts were found also in the crystal structure of the methyl-substituted analogue (i.e., PBB-1) (CCDC No: 1265699). 89 On the other hand, it is interesting that the 1,4-phenylene bis(benzoate) core and methylthio moieties of PBB-S1 are clearly segregated into each domain, as shown in Fig. 9(b).…”

“…2.48 Å) ascribed to the hydrogen bonds were observed, in contrast to PBB, PBB-1, and typical phenyl benzoates. [84][85][86][87][88][89] On the other hand, various interatomic contacts were indicated around the sulfur atoms. They implied the associated interactions, such as the S⋯HC hydrogen bonds [S(1)⋯H (10) and S(1)⋯H(4) distances of ca.…”

Diisopropyl terephthalate

“…Molecules of (I) are centrosymmetric being disposed about a centre of inversion, as is the case in the crystal structures of related compounds (Brisse & Pérez, 1976;Bailey, 1949;Hašek et al, 1982& Ciajolo et al, 1991. Similarly, all bond lengths and angles have normal values.…”

“…The molecules have an elongated shape and their orientation is almost parallel with the 2a + c vector, being inclined at an angle of 7.3°. Such a tendency for parallel arrangement is also seen in the structure of the di-p-tolyl terephtalate (Ciajolo et al, 1991) derivative, but not in the structures of dimethyl (Brisse & Pérez, 1976) and diethyl (Bailey, 1949;Hašek et al, 1982) esters.…”

“…For related structures, see: dimethyl terephthalate (Brisse & Pé rez, 1976), diethyl terephthalate (Bailey, 1949;Hašek et al, 1982) and di-p-tolyl terephthalate (Ciajolo et al, 1991).…”