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Titolo:
BIS(LIGAND) RHENIUM(V) AND TECHNETIUM(V) COMPLEXES OF 2 NATURALLY-OCCURRING BINDING MOIETIES (OXAZOLINE AND THIAZOLINE)
Autore:
SHUTER E; HOVEYDA HR; KARUNARATNE V; RETTIG SJ; ORVIG C;
Indirizzi:
UNIV BRITISH COLUMBIA,DEPT CHEM,2036 MAIN MALL VANCOUVER BC V6T 1Z1 CANADA UNIV BRITISH COLUMBIA,DEPT CHEM VANCOUVER BC V6T 1Z1 CANADA
Titolo Testata:
Inorganic chemistry
fascicolo: 2, volume: 35, anno: 1996,
pagine: 368 - 372
SICI:
0020-1669(1996)35:2<368:BRATCO>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
RAY CRYSTAL-STRUCTURE; COORDINATION CHEMISTRY; RADIOPHARMACEUTICALS; SIDEROPHORE; TC-99M;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
19
Recensione:
Indirizzi per estratti:
Citazione:
E. Shuter et al., "BIS(LIGAND) RHENIUM(V) AND TECHNETIUM(V) COMPLEXES OF 2 NATURALLY-OCCURRING BINDING MOIETIES (OXAZOLINE AND THIAZOLINE)", Inorganic chemistry, 35(2), 1996, pp. 368-372

Abstract

Attempts to prepare tris(ligand) metal complexes of technetium in intermediate oxidation states with potentially bidentate oxazoline- and thiazoline-containing ligands were unsuccessful; when pertechnetate wasreduced in the presence of excess ligand, TcO2 . xH(2)O was produced. Instead, by reaction with preformed M . O cores, a series of oxotechnetium(V) and oxorhenium(V) complexes of the formula MOXL(2) (M = Re, X= Br; M = Tc, X = Cl) and HL = 2-(2'-hydroxyphenyl)-2-oxazoline (Hot), 2-(2'-hydroxy-3'-methylphenyl)-2-oxazoline (Hmoz), 2-(2'-hydroxyphenyl)-2-thiazoline (Hthoz), and 2-(2'-hydroxyphenyl)-2-benzoxazoline (Hhbo) have been prepared. These compounds have been characterized by a variety of techniques including single-crystal X-ray diffraction. Crystals of Hthoz (C9H9NOS) are monoclinic, with space group P2(1)/n, a = 7.5342(6) Angstrom, b = 12.2187(6) Angstrom, c = 9.3942(8) Angstrom, beta = 94.233(7)degrees, and Z = 4; those of TcOCl(thoz)(2) (C18H16CIN2O3S2Tc) are monoclinic, with space group P2(1)/n, a = 16.506(1)Angstrom, b = 7.664(1) Angstrom, 16.3216(6) Angstrom. beta = 111.154(4)degrees. and Z = 4; those of ReOBr(oz)(2) (C18H16BrN2O5Re) are orthorhombic, with space group Pbca, a = 12.864(2) Angstrom, b = 25.369(2) Angstrom,c = 11.025(2) Angstrom, and Z = 8. The structures were solved by direct (Hthoz) or Patterson (metal complexes) methods and were refined by full-matrix Last-squares procedures to R = 0.033, 0.032, and 0.028 for1600, 3152, and 2651 reflections with I greater than or equal to 3 sigma(I), respectively. In the two complexes, the geometry around the metals is distorted octahedral with the halide ligands in each bound cis, and one phenolate oxygen from one ligand in each bound trans to the metal-ore linkage. In ReOBr(oz)(2), the two oxazoline nitrogens are coordinated trans to one another; in TcOCl(thoz)(2), the two thiazoline nitrogens are found cis to one another.

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Documento generato il 02/07/20 alle ore 22:27:02