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

Abstract

The reaction of ReOCl 3 (PPh 3 ) 2 with the potentially tridentate ligand S-benzyl-3-[(2-hydroxyphenyl)

Synthesis, crystal structure of new linear trinuclear isovalence Co(II)([Co3(H–L)2(L)2]), and visualizing intermolecular interactions with Hirshfeld surface method

“…Also, for the metal complex, the bands at A strong t(C=S) band was observed in the 1319 cm -1 region for the ligand, which disappeared upon complex formation. The m(C=N) and m(C-O) stretching modes of the complex showed red-shift (15 cm -1 ) and blue-shift (17 cm -1 ), respectively [16]. This spectral evidence confirms the results of the X-ray structure determination (see below), that the metal complexation occurs through phenolic oxygen, azomethine nitrogen, and thiol sulfur of ligand.…”

“…Transition metal complexes of hard-soft nitrogen-sulfur chelating agents [10][11][12][13], in particular Schiff bases derived from S-alkyl and S-aryl esters of dithiocarbazic acid [14][15][16] and thiosemicarbazones [17][18][19], have been the subject of considerable study because of their interesting physicochemical properties. Various transition and innertransition metal complexes with SN donor Schiff bases play an important role in biological systems and represent interesting models for metalloenzymes, which efficiently catalyze the reduction of dinitrogen and dioxygen [20,21].…”

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)

“…The inevitable formation of multiple isomers differing in their pharmacokinetics [10] aroused interest in developing an alternative '3+1' approach, in which a neutral oxometal complex in a distorted square pyramidal or trigonal bipyramidal molecular geometry was prepared by employing the mixed tridentate (SNS, ONS, ONO or SSS) ligand and mondentate thiol ligand with the appropriate MO 3+ precursors [11][12][13][14]. These '3+1' integrated complexes eliminated the possibility of syn and anti stereoisomers that are often produced in the tetradentate complexes, but they were found to be relatively unstable in vitro and in vivo due to metabolism and replacement of the monothiol ligand through transchelation by physiological thiols such as cysteine and glutathione [15].…”

<b>Synthesis of a ‘4+1’ Re(V) complex from Re(III), and its disproportionation to Re(IV) and Re(VII)</b>

“…One approach to the consistent synthesis of oxorhenium(V) complexes is based on the ligation of dinegative tridentate chelates in combination with monodentate uninegative thiolates to give '3+1' complexes with a square-pyramidal geometry [1][2][3]. However, these '3+1' complexes are rather unstable [4]; the kinetic stability of '3+2' six-coordinate oxorhenium(V) complexes is greater [5].…”