Structure of 3,5-dimethyl-1,2-tellurazole

Abstract

Abstract. 3,5-Dimethyl-1,2-tellurazole, CsH7NTe, M, =208.7, monoclinic, P21/c, a=13.592(3), b = 11.460 (3), c = 25.751 (9) A, /3 = 101.08 (2) °, V = 3936 (2) ,~3, Z = 24, Dx = 2.113 g cm-3, a(Mo Ka)

A survey of tellurium-centered secondary-bonding supramolecular synthons

“…Six of these crystal structures (1,2,5-telluradiazole (32) [64], phenanthro(9,10-c)-1,2,5-telluradiazole (33) [65], 4,6-di-t-butylbenzo-2,1,3-telluradiazole (37) [44], benzo-2,1,3-telluradiazole (38) [66], 4,7-dibromobenzo-2,1,3-telluradiazole (39) [66], and the DMSO adduct of 4,7-dibromobenzo-2,1,3-telluradiazole (26) [66]) feature the synthon [Te-N] 2 assembled by 1,2,5-telluradiazole heterocyclic building blocks. The corresponding SBIs are very short; the same is observed for the SBIs in [Te D] (Table 1) formed by 1,2-tellurazole heterocycles, 6 [67] and 12 [54]. Interestingly, the shortest Te-N SBIs are observed in [Te-N] 2 between two cationic heterocycles: 40, 41, and 42 [68,69].…”

“…11. Ball and stick representations of the arrangement of molecules in the lattices of (a) 38 [54] and (b) (2-p-xylene)-tetraiodo-dimethyl-di-tellurium(IV) [81]. H atoms are removed for clarity.…”

“…Examples of 1:1 adducts with pyridine or THF include the pyridine solvate of diphenylsulfiminato-trichloro-tellurium(IV) (13) [51] and tetrafluoro-bis(tetrahydrofuran)-tellurium (10) [43] while bis(triphenylphosphine)-iminium chloro-cyano-4-nitrobenzyltellurium(II) (3) [52] and bis(triphenylphosphine)-iminium bromo-cyano-4-nitrobenzyl-tellurium(II) (4) [52] are examples of 1:1 adducts with chloride and bromide anions, respectively. A ribbon supramolecular polymer is formed by dibromo-chlorophenyl-tellurium(IV) (14) [53] while a helical polymer is formed by 3,5-dimethyl-1,2-tellurazole (12) [54]. Examples of 2D arrays are catena-(( 2 -chloro)-dichloro-methyl-tellurium(IV)) (2) [55] and catena-(4,4-bis( 2 -chloro)-4-chloro-1-thia-3-selena-2,5-diaza-4-telluracyclopentadienyl) (18) [56] while a solvent capped 2D array is formed by catena-(( 2 -cyano)-bis(acetonitrile)-tricyanotellurium(IV)) (8) [43].…”

Should solid-state molecular packing have to obey the rules of crystallographic symmetry?

“…In extreme cases this characteristic results in the formation of lattice voids and hence clathrate formation. An alternative to filling space with enclathrated solvents 79 however, is the adoption of lower symmetry structures. Low symmetry packing of compounds with awkward molecular shapes seems to be particularly apparent in aromatic compounds in which p-p interactions impose specific conditions upon the optimum way in which molecular surfaces can interact.…”

A Z′=6 crystal structure of (E)-N,N′-dicyclohexylacetamidine

“…3,5-Dimethyl-1,2-tellurazole (JOSVAO) is worth mentioning here. Like 1, this compound crystallises with Z 0 = 6, in which there are two crystallographically independent, distorted 3 1 and 3 2 helical strands, each joined by TeÁ Á ÁN interactions [52].…”