Two polymorphs of dimesityltellurium dichloride

Beckmann, Jens; Bolsinger, Jens; Mebs, Stefan

doi:10.1515/mgmc-2012-0052

Cited by 1 publication

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References 15 publications

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“…During the work with (2,6-Mes 2 C 6 H 3 Te) 2 , two of these polymorphs were found serendipitously and are reported here for the first time. In this context, it is noted that conformational polymorphism is not uncommon in tellurium chemistry [40]. There are three pairs of polymorphic diarylditellurides, namely, bis(2-naphthyl)ditelluride [41], bis(4-chlorophenyl)ditelluride [42,43] and bis(4-tolyl)ditelluride [44,45], which differ for example in their C-Te-Te-C torsion angles.…”

Section: Introductionmentioning

confidence: 99%

Conformational trimorphism of bis(2,6-dimesitylphenyl)ditelluride

Grabowsky

Mallow

Pal

et al. 2018

Zeitschrift Für Kristallographie - Crystalline Materials

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Besides the previously known α-form (monoclinic, P21/c, Z=4) of bis(2,6-dimesitylphenyl)ditelluride, two new polymorphic modifications, namely the β-form (monoclinic, P21/c, Z=8) and the γ-form (triclinic, P1̅, Z=2), were obtained serendipitously during chemical reactions. In all three modifications, the individual molecules possess significantly different conformations and bond parameters, such as Te–Te bond lengths, C–Te–Te bond angles, C–Te–Te–C torsion angles and intramolecular Menshutkin interactions, which is also reflected in their non-covalent interactions with adjacent molecules in the crystal lattice via London dispersion and electrostatic forces. The interplay between intermolecular and intramolecular forces in these conformational polymorphs was investigated using quantum chemical calculations, which reveal that the β-form should be thermodynamically stable at absolute zero. In contrast, crystallization experiments and thermoanalytical investigations indicate that the α-form is stable at high temperatures and therefore, both forms might be related by enantiotropism.

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