Preparation, crystal structure and spectroscopic characterization of nickel(II) complexes with dithiocarbimate derivated of sulfonamides

Zinc-dithiocarbimates for the control of Hemileia vastatrix: a versatile alternative

BACKGROUND

The purpose of this work was to investigate the potential use of zinc-dithiocarbimate salts to control Hemileia vastatrix, the causal agent of the coffee leaf rust disease, and to evaluate their toxicity towards Apis mellifera, one of the most important coffee plant pollinators.

RESULTS

Zinc-dithiocarbimate salts were prepared and fully characterized by infrared, proton (¹ H) and carbon-13 (¹³ C) nuclear magnetic resonance and elemental analyses of carbon (C), hydrogen (H), nitrogen (N) and zinc (Zn). X-ray diffraction technique studies confirmed the proposed structures. The salts inhibited the germination of H. vastatrix spores in vitro, with a 50% inhibitory concentration (IC₅₀ ) from 12 to 18 μmol.L^-1 and a 90% inhibitory concentration (IC₉₀ ) from 23 to 26 μmol.L^-1 . Zinc-dithiocarbimate salts with the best in vitro results were selected for in vivo experiments with Coffea arabica var Caturra and with the pollinator A. mellifera. The results were similar to those of Mancozeb, a broad-spectrum contact fungicide, with a good control of the disease and low toxicity to the honeybee.

CONCLUSION

The zinc-dithiocarbimate complex salts have potential to control coffee leaf rust, with low toxicity to the pollinator insect. © 2022 Society of Chemical Industry.

Poly[di-μ-aqua-[μ6-N-(4-bromophenylsulfonyl)dithiocarbimato]dipotassium] and poly[di-μ-aqua-[μ4-N-(4-iodophenylsulfonyl)dithiocarbimato]dipotassium]

The rigid organic linkersN-(4-bromophenylsulfonyl)dithiocarbimate(2−) andN-(4-iodophenylsulfonyl)dithiocarbimate(2−) crystallize with two potassium cations and two water molecules in their asymmetric units, forming the title coordination polymers, [K2(C7H4BrNO2S3)(H2O)2]nand [K2(C7H4INO2S3)(H2O)2]n. The anions and the water molecules link the potassium cations into broad two-dimensional networks, which are further linked by K...halide interactions.

Bis(tetra-phenyl-phospho-nium) bis-[N-(trifluoro-methyl-sulfon-yl)dithio-carbimato(2-)-κS,S']zincate(II)

The title salt, (C₂₄H₂₀P)₂[Zn(C₂F₃NO₂S₃)₂], consists of a complex dianion and two tetra­phenyl­phospho­nium cations. The Zn^II ion displays a distorted tetra­hedral coordination environment with four S atoms from two S,S′-chelated N-(trifluoro­methyl­sulfonyl­)dithio­carbimate anions. In the crystal, besides the ionic inter­action of the oppositely charged ions, inter­molecular C—H⋯O inter­actions between cations and anions are observed. One of the cations inter­acts with an inversion-related equivalent by π–π stacking between phenyl rings, with a centroid–centroid distance of 3.932 (4) Å.

Efeito de um novo acelerador de vulcanização nas propriedades reométricas de composições de borracha nitrílica com diferentes teores de AN

O efeito do tipo de acelerador no processo de vulcanização de compostos de borracha nitrílica com dois teores de acrilonitrila foi investigado. Dois aceleradores comerciais, dissulfeto de 2,2'-dibenzotiazol (MBTS) e bis (dimetilditiocarbamato) de zinco (ZDMC), de grupos químicos diferentes, tiazol e ditiocarbamato, respectivamente, foram selecionados e comparados com o composto bis (4 metilfenilsulfonilditiocarbimato-)zincato (II) de tetrabutilamônio (ZNIBU). Os resultados mostram que o tipo de acelerador não só afeta as características de cura, como também tem grande influência nas propriedades físicas. Entre os aceleradores estudados, MBTS foi o menos adequado para a formulação utilizada. Surpreendentemente, verificou-se que o ZNIBU mostrou comportamento intermediário, sendo mais eficaz do que o MBTS e menos eficiente que o ZDMC, considerado um ultra-acelerador, em relação ao tempo ótimo de vulcanização.

Bis(tetra-phenyl-phospho-nium) bis-[N-(phenyl-sulfon-yl)dithio-carbimato-κS,S']platinate(II) monohydrate

The asymmetric unit of the title compound, (C₂₄H₂₀P)₂[Pt(C₇H₅NO₂S₃)₂]·H₂O, consists of two tetra­phenyl­phospho­nium cations, two half bis­[N-(phenyl­sulfon­yl)dithio­carbim­ato]platinate(II) dianions and one water mol­ecule. The anions are completed by crystallographic inversion symmetry associated with the central Pt^II ion. The Pt^II ion is doubly S,S′-chelated by two symmetry-related phenyl­sulfonyl­dithio­carbimate ligands, forming a slightly distorted square-planar configuration. Besides the electrostatic attraction between oppositely charged ions in the crystal packing, intra­molecular C—H⋯O and several inter­molecular C—H⋯O, C—H⋯N and O—H⋯O hydrogen-bonding inter­actions between the cations, anions and water mol­ecules are observed.

Bis(tetra-phenyl-phospho-nium) bis-[N-(2,5-dichloro-phenyl-sulfon-yl)dithio-carbimato(2-)-κS,S']platinate(II)

In the title salt, (C₂₄H₂₀P)₂[Pt(C₇H₃Cl₂NO₂S₃)₂], the Pt^II ion (site symmetry ) is coordinated by two S,S′-bidentate N-(2,5-dichloro­phenyl­sulfon­yl)dithio­carbimate ligands, resulting in a slightly distorted PtS₄ square-planar geometry. In the crystal, a C—H⋯O inter­action is observed, as well as electrostatic attraction between the oppositely charged ions.

Bis(tetra-phenyl-phospho-nium) bis-[N-(octyl-sulfon-yl)dithio-carbimato(2-)-κS,S']-nickelate(II)

The Ni atom in the title complex, (C₂₄H₂₀P)₂[Ni(C₉H₁₇NO₂S₃)₂], lies on a twofold axis within a square-planar geometry defined by four S atoms derived from two dithio­carbimate dianions, each forming a four-membered chelate ring. A small distortion, described by a deviation of the Ni^II atom by 0.083 (1) Å from the plane through the four S atoms, and also by the torsion angles about the Ni—S bonds, implies a folded conformation for the chelate ring.