Technetium Complexes with 2-Mercapto-methyltetrazolate

Abram, Ulrich; Dilworth, Jonathan R.

doi:10.1002/(sici)1521-3749(199904)625:4<609::aid-zaac609>3.0.co;2-r

Cited by 12 publications

(3 citation statements)

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“…317 The 5-mercapto-1-methyltetrazolate anion also reacts as a monodentate ligand to form technetium(III) and (V) complexes 183 ± 185. 318 During the synthesis of nitride complex 185, Tc(VI) is reduced to Tc(V), which is also typical of reactions with other By exchange of thiosulfate ligands in complex 186 for the 1-methyltetrazole-5-thiolate anion, binuclear nitrosyl iron complex 187 has been synthesised. 320 On the basis of IR and MoÈ ssbauer spectroscopy data, it was concluded that in this complex, tetrahedrally coordinated iron atoms are bound to each other by two N=C7S bridges.…”

Section: Metal Derivatives Of Neutral N-substituted Tetrazolesmentioning

confidence: 99%

Metal derivatives of tetrazoles

Гапоник¹,

2006

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Published data on the synthesis, structure, properties Published data on the synthesis, structure, properties and applications of metal derivatives of tetrazoles are generalised and applications of metal derivatives of tetrazoles are generalised and described systematically. Compounds based on the anionic and described systematically. Compounds based on the anionic and neutral tetrazole forms, and neutral tetrazole forms, C C-and -and N N-mono-and -mono-and C C, ,N N-disubsti--disubstituted tetrazoles are considered. The bibliography includes 464 tuted tetrazoles are considered. The bibliography includes 464 references references. . ReceivedDepending on the reaction conditions, meta-and para-5,5 Hphenyleneditetrazoles 25 react with Cd, Zn and Mn(II) salts to give essentially different, as regards both composition and structure, complexes 26, 27, 44 28, 45 29. 46 The structures of compounds 26 ± 29 were determined by X-ray diffraction. Compounds 26 ± 28 in which the doubly charged anions derived from tetrazole 25 function as bridges are two-and three-dimensional coordination polymers. Conversely, compound 29 is a mononuclear aqua complex containing no metal ± tetrazole coordination bond. In the structure of complex 28, one-dimensional channels were found which occupy up to 35% of the void volume and encapsulate tetrameric cyclic water clusters and DMF molecules. On heating to 150 8C, water and DMF are removed from the channels, which accounts for the interest of researchers in this type of compound for the preparation of inclusion compounds and sorbents. A coordination polymer with a composition similar to complex K + 7

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Section: Metal Derivatives Of Neutral N-substituted Tetrazolesmentioning

confidence: 99%

Metal derivatives of tetrazoles

Гапоник¹,

2006

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Heterobimetallic Nitride Complexes from Terminal Chromium(V) Nitride Complexes: Hyperfine Coupling Increases with Distance

et al. 2011

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Terminal nitride complexes of rhenium, osmium and molybdenum can form complexes with either alkylating agents, Lewis acidic metal halides, or low-valent, coordinatively unsaturated metal complexes. [1][2][3][4][5][6][7] The few reactions of this type with a first-row transition-metal complex are limited to vanadium. [8,9] Recently, the nitride chemistry of the chromium(V) cation has been significantly expanded by introduction of a preparative route which is based on nitrogen transfer from [Mn(N)(salen)] (salen = N,N'-bis(salicylidene)ethylenediamine) to the chromium(V) cation. [10][11][12] With a range of chromium nitride complexes at hand we have investigated their reactivity and found that nucleophilicity is a general property which can be observed during formation of imide complexes with, for example, the trityl cation, tris-(pentafluorophenyl)boron, and methyl triflate. In addition we report that terminal chromium(V) nitride complexes coordinate through the nitride ligand to low-valent complexes of the platinum metals. These compounds are possible precursors to bimetallic nitride phases which are gaining in importance as heterogeneous catalysts in, for example, the Haber-Bosch process. [13] Solutions of terminal chromium nitride complexes in noncoordinating solvents treated with electrophiles such as B(C 6 F 5 ) 3 or C(C 6 H 5 ) 3 + quickly yield intensely colored orangered or green solutions. The reactions proceed cleanly as shown by EPR spectra which display a signal from a single S = 1 = 2 spin species. Similar reactivity was observed in reactions with either [Rh(cod)Cl] 2 or cis-[PtCl 2 (dmso) 2 ] (cod = 1,5-cyclooctadiene, dmso = dimethyl sulfoxide). Structures of some of these systems, characterized by single-crystal X-ray diffraction, are shown in Scheme 1.Experimental and crystallographic details such as ORTEP drawings and metric parameters of complexes 1-5 (Scheme 1) are available in the Supporting Information (Tables S1 and S1 a). Inspection of the structures reveals a number of general aspects: there is a strong propensity for the chromium center to increase its coordination number from five to six upon coordination of the nitride ligand. This propensity is expected and a consequence of the trans influence of either an imide or a bridging nitride ligand which is significantly lower than that of a terminal nitride ligand. Accompanying this, the displacement of Cr out of the plane spanned by the equatorial ligators is diminished from about 0.5 to about 0.2 . The Cr À N bond length is elongated from 1.55 in the terminal nitride complexes to approximately 1.60-1.62 in the functionalized systems. Comparison of structure 1 with that of [Cr(N)-(salen)] reveals that the metal-salen ligand bonds are significantly shorter when the nitride ligand is functionalized, as expected when two ligands compete for electron donation. However, for the systems derived from [Cr(N)(dbm) 2 ] the situation is less clear (dbm = dibenzoylmethanolate). In complex 2 all the Cr-dbm bonds are longer than in the parent terminal nit...

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“…59 Monodentate thiolate complexes of technetium are unusual, but 2-mercaptomethyltetrazole, HL 6 , gives the Tc(V) square-pyramidal complexes [TcNL 6 4 ] 2À and [TcOL 6 4 ] À and the Tc(III) trigonal-bipyramidal (L 6 equatorial) [TcL 6 3 (NCMe)(PPh 3 )]. 60 Technetium follows rhenium and other metals in forming two isomers of [Tc 2 Cl 4 (dppe) 2 ]. The mauve a-isomer with chelating dppe is formed from a large excess of dppe and [Tc 2 Cl 4 (PMePh 2 ) 4 ], but using less dppe or [Tc 2 Cl 4 (PEt 3 ) 4 ] gives the pale pink dppe-bridged b-isomer.…”

Section: Technetiummentioning

confidence: 99%

13 Manganese, technetium and rhenium

Thornton¹

2000

Annu. Rep. Prog. Chem., Sect. A

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Technetium Complexes with 2-Mercapto-methyltetrazolate

Cited by 12 publications

References 6 publications

Metal derivatives of tetrazoles

Metal derivatives of tetrazoles

Heterobimetallic Nitride Complexes from Terminal Chromium(V) Nitride Complexes: Hyperfine Coupling Increases with Distance

13 Manganese, technetium and rhenium

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