Isolation of the novel example of a monomeric organotellurinic acid

Abstract

The synthesis of the first example of a monomeric, stable organotellurinic acid is reported by utilizing the σ-hole participation of the Te atom with the N atom of the 2-(2′-pyridyl)phenyl moiety.

Chalcogen Bonds in Selenocysteine Seleninic Acid, a Functional GPx Constituent, and in Other Seleninic or Sulfinic Acid Derivatives

“…The single/double bond notation is adopted in this manuscript to designate the two selenium‐oxygen bonds and in 1 a the Se–OH and the Se=O bonds separations are 178.6 and 167.8 pm, respectively. These values are in good agreement with the typical selenium‐oxygen bonds separations in seleninic acids, [44,47] are significantly longer than those in sulfinic acids (e. g., 159.5 and 149.5 pm in methanesulfinic acid), [45] and are shorter than those in tellurinic acids (e. g., 196.6 and 183.4 pm in pyridinetellurinic acid), [46] coherent with the different size of the chalcogen atoms (Table 1S). Selenium‐oxygen distances are longer in 1 a than the corresponding distances in selenocysteic acid (164.1–163.0 pm).…”

Exploring the Role of Strong Intramolecular Coordination of the 2‐(2'‐pyridyl)phenyl Group in Heavy Main Group Halides: Insights from Synthesis, Structural, and Bonding Analyses

“…Though the covalent radii of Sn, Sb and Te are almost same,[16b] the N→Te bond length [2.277(3) Å] in ppyTeCl 3 is significantly shorter in comparison to those observed in 2 and 3 . Interestingly, the Te–Cl distance trans to the pyridyl N atom [2.465(1) Å] is shorter than that observed in 2 [2.4243(7) Å] and longer than those of 3 [2.634(1) Å] and 4 [2.715(5) Å] …”

“…Moving across the period 5 halides of “ppy” moiety, we have considered the molecular structure of ppyTeCl 3 for comparative study . Though the covalent radii of Sn, Sb and Te are almost same,[16b] the N→Te bond length [2.277(3) Å] in ppyTeCl 3 is significantly shorter in comparison to those observed in 2 and 3 .…”

“…All the bond parameters for the new polymorphs of 5 and 6 lie in the same range with respect to their corresponding reported structures . Of particular interest in the molecular structure of 5 is the N→Te distance of 2.228(2) Å [2.205(11) Å[11a]], which is significantly shorter in comparison to that of the corresponding tellurium(IV) trichloride, i.e., ppyTeCl 3 [2.277(3) Å] …”

“…Recently, using the strong intramolecular coordination ability of the N atom of the 2‐(2'‐pyridyl)phenyl group (ppy), V , we have succeeded in the isolation of the novel example of monomeric organotellurinic(IV) acid and Te and Bi analogues of non‐N‐Heterocyclic Carbene (non‐NHC) derivatives , . The molecular structures of both these classes of compounds reveal that the pyridyl N‐atom of the ppy group makes very strong electrostatic interaction with the element (Te/Bi) center.…”