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Technetium Complexes with 2‐Mercapto‐methyltetrazolate
Author(s) -
Abram Ulrich,
Dilworth Jonathan R.
Publication year - 1999
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/(sici)1521-3749(199904)625:4<609::aid-zaac609>3.0.co;2-r
Subject(s) - chemistry , monoclinic crystal system , ligand (biochemistry) , crystallography , bond length , denticity , steric effects , metal , stereochemistry , aryl , square pyramid , toluene , crystal structure , biochemistry , receptor , alkyl , organic chemistry
2‐Mercapto‐methyltetrazolate, Smetetraz – , acts as monoanionic, monodentate ligand in a number of technetium compounds. Anionic Tc V complexes of the types [TcO(Smetetraz) 4 ] – and [TcN(Smetetraz) 4 ] 2– are formed when (Bu 4 N)[Tc V OCl 4 ] or (Bu 4 N)[Tc VI NCl 4 ], respectively, react with Na(Smetetraz). Reduction of the metal takes place in the latter case. (Bu 4 N) 2 [TcN(Smetetraz) 4 ] crystallises in the monoclinic space group Pc (a = 9.701(5), b = 17.570(5), c = 16.821(10) Å, β = 96.50(3)°, Z = 2). The Tc atom is situated 0.580(3) Å above the basal plane of a square pyramid which is formed by the sulfur atoms and the nitrido ligand as its apex. The Tc–S bond lengths lie between 2.384(3) and 2.410(3) Å. [Tc(PPh 3 )(Smetetraz) 3 (CH 3 CN)] is formed during the reaction of [TcCl 3 (PPh 3 ) 2 (CH 3 CN)] with NaSmetetraz as blue needles with co‐crystallised solvent toluene (space group C2/c, a = 24.188(4), b = 14.373(1), c = 25.617(5) Å, β = 109.48(1)°, Z = 8). The metal atom is coordinated by PPh 3 and CH 3 CN in the axial position of a trigonal bipyramid. All three aryl rings are on the sterically less strained side of the plane defined by the sulfur atoms. The Tc–S bond lengths range between 2.233(2) and 2.247(2) Å.