TAUTOMERIC CONVERSION OF A THIOUREA LIGAND UPON FORMATION OF A HYPERVALENT TELLURIUM (II) COMPLEX. SYNTHESIS, AND X-RAY STRUCTURAL STUDIES OF N-PHENYL-N′-(1,3-THIAZOL-2-YL)-THIOUREA AND BROMOPHENYL [1-PHENYL-3-(1′,3′-THIAZOL-3′-IUM-2′-YL)-ISOTHIOUREIDATO]TELLURIUM(II)

Autor:	Martin D. Rudd, Sergey V. Lindeman, Steinar Husebye
Rok vydání:	1997
Předmět:	Coordination sphere Ligand Stereochemistry Organic Chemistry Hypervalent molecule chemistry.chemical_element Ring (chemistry) Biochemistry Medicinal chemistry Tautomer Inorganic Chemistry Bond length chemistry.chemical_compound Thiourea chemistry Tellurium
Zdroj:	Phosphorus, Sulfur, and Silicon and the Related Elements. 123:313-327
ISSN:	1563-5325 1042-6507
DOI:	10.1080/10426509708044219
Popis:	The divalent tellurium title complex (II) has been synthesized by addition of Ph2Te2 and Br2 to the ligand 1-phenyl-3-(2-thiazolyl)-2-thiourea (I).The molecular structures of I and II were subsequently determined by X-ray crystallographic methods. As a result, it was found that upon complexation, the ligand had undergone a transition from a thiourea to to an isomeric isothiourea, involving a transfer of a thiourea proton to the thiazolyl ring. This does not seem to influence the bonding properties of the ligand, and the reasons for this are discussed. The central tellurium atom is three-coordinate and its coordination sphere is T-shaped with a linear S-Te-Br sequence with bond lengths Te(1)-S(1) and Te(1)-Br(1) equal to 2.548(1) and 2.883(1) A, respectively, and ∠ S(1)-Te(1)-Br(1)=174.49(2)°. At nearly right angles to this sequence, there is a Te(1)-C(11)(phenyl) bond of 2.127(3) A.
Databáze:	OpenAIRE
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