Synthesis and characterization of two tris-chelate complexes of cobalt(III) with 3,5-dimethyl-1-(N-methyl/ethyl)thiocarbamylpyrazole (HL1, HL2) — biologically important bidentate ligands with one ambidentate donor site
TL;DR: In this paper, the structure of Co(L 2 ) 3 has been determined by single-crystal X-ray diffraction studies and the complex has a distorted octahedral structure with the ambidentate ligands coordinated to the Co(III) ion as uninegative bidentate chelating agents via the pyrazole ring nitrogen (tertiary) and the thiocarbamyl iminyl nitrogen atoms.
About: This article is published in Polyhedron.The article was published on 2000-12-30. It has received 16 citations till now. The article focuses on the topics: Octahedral molecular geometry & Denticity.
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Abstract: New six coordinated tris-chelate cobalt(III) complexes of the type [Co(L)3] (1–4) {where HL = N-[di(alkyl/aryl)carbamothioyl]benzamide derivatives}were prepared from the reaction between CoCl2·6H2O and N-[di(alkyl/aryl)carbamothioyl]benzamide in ethanol and characterized by elemental analysis and spectral data (UV/Vis, IR, 1H & 13C NMR). The molecular structure of a representative complex [Co(L1)3] (1) [where HL1 = N-(diisopropylcarbamothioyl)benzamide], was determined by single crystal X-ray diffraction method and reveals a distorted octahedral geometry and a facial configuration of S atoms around the Co(III) center. These complexes act as efficient catalysts for the oxidation of alcohols to their corresponding aldehydes or ketones in presence of tert-butyl hydroperoxide (TBHP) at 80 °C.
55 citations
TL;DR: The use of metal complexes fac-tris(1-phenylpyrazolato-N,C(2)('))cobalt(III) [fac-Co(ppz)(3)], fac- Tris[2-((pyrrole-2-ylmethylidene)amino)ethyl]amine]gallium[Ga(pma)] as materials for hole-transporting layers (HTL) in organic light-emitting diodes
Abstract: The use of metal complexes fac-tris(1-phenylpyrazolato-N,C2‘)cobalt(III) [fac-Co(ppz)3], fac-tris(2-phenylpyridinato-N,C2‘)cobalt(III) [fac-Co(ppy)3], and {tris[2-((pyrrole-2-ylmethylidene)amino)ethyl]amine}gallium(III) [Ga(pma)] as materials for hole-transporting layers (HTL) in organic light-emitting diodes (OLEDs) is reported. Co(ppz)3 and Co(ppy)3 were prepared by following literature procedures and isolated as mixtures of facial (fac) and meridional (mer) isomers. The more stable fac isomers were separated from the unstable mer forms via column chromatography and thermal gradient sublimation. Crystals of fac-Co(ppz)3 are monoclinic, space group P21/c, with a = 13.6121(12) A, b = 15.5600(12) A, c = 22.9603(17) A, β = 100.5°, V = 4781.3(7) A3, and Z = 8. {Tris[2-((pyrrol-2-ylmethylidene)amino)ethyl]amine}gallium [Ga(pma)] was prepared by the reaction of gallium(III) nitrate with the pmaH3 ligand precursor in methanol. Ga(pma) crystallizes in the cubic space group I43d with cell parameters a = 20.2377(...
41 citations
TL;DR: In this article, two sets of Schiff base ligands, set-1 (HL1, HL2) and set-2 (H2L3, H2L4) which have been prepared by mixing 1,3-diaminopropane and aldehydes in 1:1 and 1:2 ratios, respectively, are employed for the synthesis of complexes with cobalt perchlorate.
41 citations
TL;DR: In this article, the complex formation of cobalt(II)-, nickel(II), and copper(II) sulphate hydrates with 3,5-dimethyl-1-thiocarboxamide pyrazole (HL) was studied.
Abstract: The complex formation of cobalt(II)-, nickel(II) and copper(II) sulphate hydrates with 3,5-dimethyl-1-thiocarboxamidepyrazole (HL) was studied. The influence of the anions on the course of the reactionwas also examined, using nickel(II) salts with various anions. Beside the NiSO 4 ·7H 2 O the reaction hasbeen carried out with Ni(OAc) 2 , Ni(CF 3 COO) 2 and Ni(SCN) 2 . Compounds with the following compo-sition were obtained: Co(L) 3 , Ni(L) 2 and [Cu(SCN)L] 2 . The structure of the ligand and the Co(L) 3 complex was determined by single crystal X-ray analysis, while that of the Ni(L) 2 was solved by anal-ysis of powder diffraction X-ray data. The most probable structure of the copper(II) complex is pro-posed on the basis of the elemental analyses data, FT-IR spectrometry and magnetic measurement.The thermal decomposition of the complexes was investigated by thermogravimetry, DSC andcoupled TG-MS measurements. In the case of the nickel(II) compound, a relatively stable intermedi-ate was detected in the 550–650 K temperature range. The composition of the intermediate,Ni(SCN)(NCS), was determined by FT-IR-spectrometry.
32 citations
TL;DR: Three copper(II) complexes of a novel pyrazole containing porphyrinogen and cobalt(III) and zinc(II), containing tripodal ligand having N-donor atoms have been investigated and show distorted square pyramidal coordination environments for 1a and 1b with the water molecule occupying the apical site, while for complex 2 a distorted octahedral geometry is obtained.
Abstract: Copper(II) complexes of a novel pyrazole containing porphyrinogen and cobalt(III) and zinc(II) complexes of a pyrazole containing tripodal ligand having N-donor atoms have been investigated. 5-Methyl-3-formylpyrazole (MPA) on reaction with copper(II) nitrate or perchlorate in the presence of tris(2-aminoethyl)amine (tren) forms novel pyrazole-based porphyrinogen complexes [Cu(T(3)-porphyrinogen)(H(2)O)](NO(3))(2) (1a) and [Cu(T(3)-porphyrinogen)(H(2)O)](ClO(4))(2) (1b) where T(3)-porphyrinogen is 1,6,11,16-tetraaza-5,10,15,20-tetrahydroxy-2,7,12,17-tetramethylporphyrinogen. The same products are also obtained when tren is replaced by triethylamine. By contrast, the reaction between MPA, tren, and cobalt(II) perchlorate produces the cobalt(III) complex [Co(HMPz(3)tren)]ClO(4) (2) derived from the tripodal Schiff base tris[4-(3-(5-methyl-pyrazolyl)-3-aza-3-butenyl]amine (H(3)MPz(3)tren). The X-ray crystal structures of the copper(II) complexes (1a and 1b) and the cobalt(III) complex (2) have been determined. The structures show distorted square pyramidal coordination environments for 1a and 1b with the water molecule occupying the apical site, while for complex 2 a distorted octahedral geometry is obtained. Data for 1a follow: a = 19.476(3) A, b = 9.4116(8) A, c = 14.204(3) A; alpha = 90 degrees = gamma, beta = 107.58(2) degrees; V = 2482.0(7) A(3), Z = 4. Data for 1b follow: a = 20.967(3) A, b = 9.1563(18) A, c = 14.858(4) A; alpha = 90 degrees = gamma, beta = 108.44(3) degrees; V = 2706.0(10) A(3), Z = 4. Data for 2 follow: a = 21.293(3) A, b = 12.724(2) A, c = 19.777(4) A; alpha = 90 degrees = gamma, beta = 93.03(2) degrees; V = 5350.6(15) A(3), Z = 8. All three complexes crystallize in the monoclinic crystal system with the C2/c space group. The complexes are further characterized by UV-vis, IR, EPR, and electrochemical studies.
31 citations
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TL;DR: Cotton and Wilkinson's Advanced Inorganic Chemistry (AIC) as discussed by the authors is one of the most widely used inorganic chemistry books and has been used for more than a quarter century.
Abstract: For more than a quarter century, Cotton and Wilkinson's Advanced Inorganic Chemistry has been the source that students and professional chemists have turned to for the background needed to understand current research literature in inorganic chemistry and aspects of organometallic chemistry. Like its predecessors, this updated Sixth Edition is organized around the periodic table of elements and provides a systematic treatment of the chemistry of all chemical elements and their compounds. It incorporates important recent developments with an emphasis on advances in the interpretation of structure, bonding, and reactivity.From the reviews of the Fifth Edition:* "The first place to go when seeking general information about the chemistry of a particular element, especially when up-to-date, authoritative information is desired." -Journal of the American Chemical Society.* "Every student with a serious interest in inorganic chemistry should have [this book]." -Journal of Chemical Education.* "A mine of information . . . an invaluable guide." -Nature.* "The standard by which all other inorganic chemistry books are judged."-Nouveau Journal de Chimie.* "A masterly overview of the chemistry of the elements."-The Times of London Higher Education Supplement.* "A bonanza of information on important results and developments which could otherwise easily be overlooked in the general deluge of publications." -Angewandte Chemie.
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