MIXED-LIGAND CHELATES OF OSMIUM(II/III) 8-QUINOLINOLATES - SYNTHESIS, CHARACTERIZATION AND REDOX BEHAVIOR

被引：26

作者：

ROY, BK ^{[1
]}

MALLICK, TK ^{[1
]}

GHOSH, BK ^{[1
]}

机构：

[1] UNIV BURDWAN GOLAPBAG,DEPT MED,BURDWAN 713104,W BENGAL,INDIA

来源：

POLYHEDRON | 1992年 / 11卷 / 14期

关键词：

D O I：

10.1016/S0277-5387(00)83246-5

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The synthesis and characterization of six mixed-ligand complexes of type [OsQL2]Z+ (4) [L = 2,2'-bipyridine (bpy; L1, 2) and 2-(m-tolylazo)pyridine (tap; L2, 3); Q = deprotonated forms of 8-quinolinol (HQ1) and 2-methyl-8-quinolinol (HQ2); Z = 1 for osmium(II) and Z = 2 for osmium(III)] as perchlorates are described. For L = bpy only, osmium(III) chelates were obtained and the route for interconversion of osmium(III) and osmium(II) species was found. The chelates exhibit osmium(IV)-osmium(III) and osmium(III)-osmium(II) couples in the range 0.1-1.6 V vs SCE. The redox stability of the metal centre in these complexes and in OsQ3 is correlated on the basis of the pi-acceptor properties of these ligands. Ligand reductions are observable in successive one-electron transfer steps in the range -0.3 to -2.3 V. The non-innocent N,N ligands provide one redox orbital for each alpha-diimine/azoimine group. Complete/nearly complete redox series have been identified.

引用

页码：1829 / 1835

页数：7

共 22 条

[11]

HEMMERICH P, 1982, STRUCT BOND, V48, P93

[12]

Hemmerich P, 1966, FLAVINS FLAVOPROTEIN, P82

[13] HIGHLY LUMINESCENT POLYPYRIDYL COMPLEXES OF OSMIUM(II) [J].

KOBER, EM ;

SULLIVAN, BP ;

DRESSICK, WJ ;

CASPAR, JV ;

MEYER, TJ .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1980, 102 (24) :7383-7385

[14] CONCERNING THE ABSORPTION-SPECTRA OF THE IONS M(BPY)32+ (M=FE,RU,OS, BPY=2,2'-BIPYRIDINE) [J].

KOBER, EM ;

MEYER, TJ .

INORGANIC CHEMISTRY, 1982, 21 (11) :3967-3977

[15] RUTHENIUM AND OSMIUM COMPLEXES OF N,O CHELATORS - SYNTHESES, OXIDATION LEVELS, AND DISTORTION PARAMETERS [J].

LAHIRI, GK ;

BHATTACHARYA, S ;

GHOSH, BK ;

CHAKRAVORTY, A .

INORGANIC CHEMISTRY, 1987, 26 (26) :4324-4331

[16]

MAHAPATRA AK, 1986, J INDIAN CHEM, V68, P101

[17] ELECTRON-SPIN-RESONANCE CHARACTERIZATION OF THE REDOX ORBITALS IN [OS(BPY)3]2+ [J].

MORRIS, DE ;

HANCK, KW ;

DEARMOND, MK .

INORGANIC CHEMISTRY, 1985, 24 (06) :977-979

[18]

Roy B., UNPUB

[19]

SAWYER DT, 1974, EXPT ELECTROCHEMISTR, P167

[20] CHEMISTRY OF HIGHLY REDUCED POLYPYRIDYL-METAL COMPLEXES - ANION SUBSTITUTION INDUCED BY LIGAND-BASED REDUCTION [J].

SULLIVAN, BP ;

CONRAD, D ;

MEYER, TJ .

INORGANIC CHEMISTRY, 1985, 24 (22) :3640-3645

← 1 2 3 →