Synthesis and structural characterization of ruthenium and osmium carbonyl clusters containing 4,6-dimethylpyrimidine-2-thione

Characterization, quantum, antibacterial, antifungal and antioxidant studies on Hg(II) and Cd(II) complexes of allyl and ethyl thiosemicarbazides derived from 2-aminothiazole-4-yl acetohydrazide

“…It is known that 2-aminothiazole is an effective compound with a broad range of biological activity; also, it is an intermediate in the preparation of antibiotics and dyes [2] according to more than one type of donor atoms in thiosemicarbazide derivatives and their pronounced microbial activities [3][4][5]. Their metal complexes have attracted considerable attention which can introduce novel reactivity and frequently stabilize the metal cluster framework [6][7][8][9]. As an extension of our study on thiosemicarbazide moiety [10][11][12][13], we report herein the preparation of Cd (II) and Hg (II) complexes derived from a new thiosemicarbazide, namely 2-amino-4-yl acetothiosemicarbazide ending by ethyl (H2TAET) and allyl (H2TAAT) groups.…”

Decarbonylation Reaction of [Os3(CO)10(μ-H)(μ-SN2C4H5)]: X-ray Structures of the Two Isomers of [Os3(CO)9(μ-H)(μ 3-η 2-SN2C4H5)]

“…In recent years, the reactions of transition metal carbonyl clusters with heterocyclic ligands containing more than one hetero-atoms have been widely investigated. 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18 These reactions are markedly influenced by the structure of the heterocyclic ring, starting clusters and also by the reaction conditions employed. Trinuclear osmium clusters have proved to be useful system for modeling heterogeneous catalytic processes such as hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) which are associated with the cleavage of C-X bonds (X = S, N).…”

“…Trinuclear osmium clusters have proved to be useful system for modeling heterogeneous catalytic processes such as hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) which are associated with the cleavage of C-X bonds (X = S, N). 1,2,3,4,5,6,7,8,10,12,13,19,20,21,22,23 The presence of heteroatom's such as sulfur 24,25,26 and nitrogen 27,28,29 not only stabilizes the metal cluster framework with respect to degradational fragmentation in drastic conditions but also provide new types of reactivities and increase the coordination potential towards multi-metal centers. Many of the resultant complexes are biologically important as they can be used as models for metal-centers in metalloproteins 30,31,32,33,34 and also possess different industrial applications such as anticorrosion and as accelerators in the rubber vulcanization process.…”

Investigations of 2-Thiazoline-2-thiol as a Ligand: Synthesis and X-ray Structures of [Mn2(CO)7(μ-NS2C3H4)2] and [Mn(CO)3(PPh3)(κ 2-NS2C3H4)]

“…The study of the reactivity of nitrogen and sulfur containing small heterocyclic organic molecules towards transition metal carbonyl clusters has attracted considerable interest because such ligands frequently stabilizes the metal cluster framework by serving as chelating or bridging ligands 1,2,3,4,5 and also due to their potential applicability in modeling hydrodenitrogenation (HDN) and hydrodesulfurization (HDS) processes. 1,2,3,4,5,6,7 These reactions are usually accompanied by C-H, N-H, S-H and C-N bonds activation of the heterocyclic ligand and markedly influenced by the structure of the heterocycle as well as the reaction conditions and starting complexes.…”

“…The study of the reactivity of nitrogen and sulfur containing small heterocyclic organic molecules towards transition metal carbonyl clusters has attracted considerable interest because such ligands frequently stabilizes the metal cluster framework by serving as chelating or bridging ligands 1,2,3,4,5 and also due to their potential applicability in modeling hydrodenitrogenation (HDN) and hydrodesulfurization (HDS) processes. 1,2,3,4,5,6,7 These reactions are usually accompanied by C-H, N-H, S-H and C-N bonds activation of the heterocyclic ligand and markedly influenced by the structure of the heterocycle as well as the reaction conditions and starting complexes. We have previously investigated the reactions of pyridine-2-thiol, 8 pyrimidine-2-thiol, 8 thiazole, 9,10 4-methylthiazole, 11 thiazolidine, 7 thiomorpholine, 7 benzothiazole, 6 and benzimidazole-2-thiol 6 with osmium and ruthenium carbonyl clusters and observed that the type of products obtained in these reactions are remarkably influenced by the intrinsic reactivity of the metal carbonyl clusters, the heterocyclic ligands and the reaction conditions.…”