Secondary bonding. Part 9. Crystal and molecular structures of µ-oxo-bis[nitratodiphenyltellurium(IV)]–diphenyltellurium(IV) hydroxide nitrate (1/1), oxophenyltellurium(IV) nitrate, and diphenyltellurium(IV) dinitrate

Abstract

The crystal and molecular structures of the title compounds have been determined from diffractometer data by the heavy-atom method. Crystals of [{Ph₂Te(No₃)}₂O]–Ph₂Te(NO₃)(OH)(1) are triclinic, space group P, with unit-cell dimensions (290 K)a= 11.839(3), b= 11.220(1), c= 14.793(3)Å, α= 90.85(1), β= 100.98(2), γ= 99.28(2)°, Z= 2, and for 5 577 observed reflections [I/σ(l) 3.0], R= 0.022. Crystals of [PhTeO(NO₃)]_n(2) are triclinic, space group P, with unit-cell dimensions (290 K)a= 11.555(5), b= 5.350(2), c= 14.987(3)Å, α= 94.89(3), β= 110.68(3), γ= 106.07(3)°, Z= 4, and for 2 465 observed reflections, R= 0.026. Crystals of Ph₂Te(NO₃)₂(3) are monoclinic, space group C2/c, with unit-cell dimensions (233 K)a= 17.929(6), b= 7.100(2), c= 11.193(2)Å, β= 94.38(2)°, Z= 4, and for 1 100 observed reflections, R= 0.031. All three compounds contain four-co-ordinate pseudo-trigonal-bipyramidal tellurium atoms each with the lone pair in the vacant equatorial position. Compound (3) is essentially monomeric, while in (1) the component molecules are linked by bridging nitrate groups and (2) is polymeric. All contain weak secondary bonds Te ⋯ O (2.862–3.514 Å), Te–C 2.094–2.120, Te–OH in (1) 1.953(3), Te–O(bridge) 1.887–2.015, and Te–O(NO₃) 2.171–2.533 Å.