Schiff base chemistry of the {ReO} core: structural characterization of the unusual '3 + 2' complex [ReO(eta-OC(6)H(4)-CH=NC(6)H(4)-2-S)(eta-OC(6)H(4))]

Schiff base chemistry of the rhenium(V)-oxo core with '3+2' ligand donor sets

Reactions of [ReOCl(3)(PPh(3))(2)] with the bidentate ligands 2-(2-hydroxyphenyl) benzoxazole and (2'-hydroxyphenyl)-2-thiazoline resulted in the isolation of the complexes [ReOCl(2)(OC(6)H(4)-2-C=NC(6)H(4)-2-O)(PPh(3))] (1) and [ReOCl(2)(OC(6)H(4)-2-C=NCH(2)CH(2)S)(PPh(3))] (2). Reactions of 1 with the tridentate Schiff base ligands salicylaldehyde 2-hydroxyanil (H(2)L(1b)), salicylaldehyde 2-mercaptoanil (H(2)L(2b)) afnd S-benzyl-2-[(2-hydroxyphenyl)methylene] dithiocarbazate (H(2)L(3b)) yielded the '3+2' rhenium(V) oxo species [ReO(OC(6)H(4)-2-C=NC(6)H(4)O) (OC(6)H(4)CH=NC(6)H(4)O)] (3), [ReO(OC(6)H(4)-2-C=NC(6)H(4)O)-(OC(6)H(4)CH=NC(6)H(4)S)] (4) and [ReO(OC(6)H(4)-2-C=NC(6)H(4)O){OC(6)H(4)CH=N-N=C(SCH(2)C(6)H(5))S}] (5). Similarly, the reactions of [ReOCl(2)(OC(6)H(4)-2-C=NC(6)H(4)S)(PPh(3))] (2) with H(2)L(2b), H(2)L(3b) and 2-[(2-hydroxyphenyl) methylene]-N-phenyl-hydrazinecarbothioamide (H(2)L(4b)) were exploited to prepare [ReO(OC(6)H(4)-2-C=NC(6)H(4)S)(OC(6)H(4)CH=NC(6)H(4)O)] (6), [ReO(OC(6)H(4)C=NC(6)H(4)S){OC(6)H(4)CH=N-N=C (SCH(2)C(6)H(5))S}] (7) and [ReO(OC(6)H(4)-2-C=NC(6)H(4)S){OC(6)H(4)CH=N-N=C(NHC(6)H(5))}] (8), respectively.

Synthesis and structural characterization of rhenium(I) tricarbonyl complexes with the bidentate ligands o-(diphenylphosphino)benzaldehyde (P∩O) and o-[(diphenylphosphino)benzylidene]analine (P∩N)

A series of rhenium(I) tricarbonyl complexes with bidentate P,O donor ligand o-(diphenylphosphino)benzaldehyde (P∩O) and its Schiff base P,N donor ligand o-[diphenylphosphino)benzylidene]analine (P∩N) have been synthesized and structurally characterized. All the complexes of the type [ReX(CO)(3)(LL)] (where LL = P∩O, P∩N) reveal a distorted octahedral structure with the three carbonyl ligands arranged in the facial fashion. Crystal data for 1, C(22)H(15)ClO(4)PRe·1/2C(6)H(14): triclinic, P1, a=8.7430(4), b=9.5767(4), c=13.9449(6) Å, α=93.651(1), β=101.265(1), γ=93.048(1); V=1140.20(9) Å(3), Z=2.2, C(22)H(15)BrO(4)Pre: monoclinic, C2/c, a=31.6800(16), b=8.8880(4), c=18.4517(9) Å, β=124.990(1); V=4256.4(4) Å(3), Z=8. 3, C(28)H(20)ClNO(3)Pre: monoclinic, C2/c, a=22.675(4), b=8.803(2), c=28.218(5) Å, β=100.192(3); V=5543.5(16) Å(3), Z=8.4, C(28)H(20)BrNO(3)Pre: monoclinic, C2/c, a=23.035(1), b=8.7561(4), c=28.269(1) Å, β=100.811(1); V=5600.4(5) Å(3), Z=8.

Exploring oxorhenium '3+1' mixed-ligand complexes carrying the S-benzyl-3-[(2-hydroxyphenyl)methylene]dithiocarbazate [ONS]/monothiol [S] donor set: synthesis and characterization

The reaction of ReOCl(3)(PPh(3))(2) with the potentially tridentate ligand S-benzyl-3-[(2-hydroxyphenyl)methylene]dithiocarbazate ([ONS] donor set) and para-substituted benzenethiols [C(6)H(4)X-4-SH] (where X=H, F, Cl, Br and OCH(3)) in the presence of Et(3)N afforded a series of integrated '3+1' oxorhenium(V) complexes with general formula [ReO{eta(3)-OC(6)H(4)-2-CH=N-N=C(SCH(2)Ph)-S}(eta(1)-C(6)H(4)X-4-S)]. The molecular structure of [ReO{eta(3)-OC(6)H(4)-2-CH=N-N=C(SCH(2)Ph)-S}(eta(1)-C(6)H(4)F-4-S)] (4) was determined by single-crystal X-ray analysis. Complex 4 consists of a central oxorhenium(V) core with phenolic oxygen, azomethine nitrogen and thiol sulfur donor from the thiosemicarbazone Schiff base ligand and one sulfur donor from monothiol ligand completing a distorted square pyramidal environment. Crystal data for 4, C(21)H(16)FN(2)O(2)S(3)Re: orthorhombic, P2(1)2(1)2(1), a=5.6682(3), b=11.6600(6), c=31.697(2) A, V=2094.9(2) A(3), Z=4.