Characterization Of Technetium Research Articles

Characterization of technetium(vII) reduction by cell suspensions of thermophilic bacteria and archaea

Washed cell suspensions of the anaerobic hyperthermophilic archaea Thermococcus pacificus and Thermoproteus uzoniensis and the anaerobic thermophilic gram-positive bacteria Thermoterrabacterium ferrireducens and Tepidibacter thalassicus reduced technetium [(99)Tc(VII)], supplied as soluble pertechnetate with molecular hydrogen as an electron donor, forming highly insoluble Tc(IV)-containing grayish-black precipitate. Apart from molecular hydrogen, T. ferrireducens reduced Tc(VII) with lactate, glycerol, and yeast extract as electron donors, and T. thalassicus reduced it with peptone. Scanning electron microscopy and X-ray microanalysis of cell suspensions of T. ferrireducens showed the presence of Tc-containing particles attached to the surfaces of non-lysed cells. This is the first report on the reduction in Tc(VII) by thermophilic microorganisms of the domain Bacteria and by archaea of the phylum Euryarchaeota.

Preparation and characterization of technetium and rhenium tricarbonyl complexes bearing the 4-nitrobenzyl moiety as potential bioreductive diagnostic radiopharmaceuticals. In vitro and in vivo studies

The synthesis of a ligand containing a nitrobenzyl group as bioreductive pharmacophore and the preparation of the corresponding technetium and rhenium complexes are presented. 99mTc labelling was performed in high yield (>90%) by ligand substitution using fac-[ 99mTc(CO) 3(H 2O) 3] + as precursor. The structure of the technetium complex was established by chromatographic comparison with the analogous rhenium compound which was fully characterized by elemental analysis, spectroscopic methods and X-ray crystallography. Reduction potential of the rhenium complex was in the characteristic range for bioreductive compounds. Biodistribution in normal mice was characterized by fast blood and soft tissue depuration and combined excretion via the hepatobiliary and urinary systems. Tumour uptake was low, probably due to low lipophilicity but tumour/muscle ratios were favourable as a consequence of high excretion.

Raman studies of technetium in borosilicate waste glass

The characterization of technetium (Tc) environments in borosilicate glasses is important with regard to the long-term isolation of Tc in nuclear wastes from the environment by waste vitrification. In this study, Raman spectroscopy was used to detect Tc in various borosilicate waste glass formulations in which Tc valence and average coordination environment were previously characterized by X-ray absorption spectroscopy. Raman spectral comparisons between chemically equivalent Tc-containing and Tc-free borosilicate glass pairs indicate Tc-dependent features near 320 and 910 cm−1 resulting from internal vibrational modes of pertechnetate tetrahedral (Tc7+ in TcO4 −), similar to those observed for pertechnetate aqueous solutions. Initial observations of the pertechnetate Tc–O symmetric stretch mode near 910cm−1 indicate a peak area dependence on pertechnetate concentration and a detection limit near 50 ppm Tc7+ in borosilicate glass. Pertechnetate Tc–O symmetric stretch mode frequency versus composition relationships for the borosilicate waste glasses suggest that pertechnetate tetrahedra are surrounded by network-modifying cations. However, Raman spectroscopy is insensitive to six-coordinated Tc4+ species in borosilicate glasses.

Characterization of Technetium(VII) reduction by cell suspensions of thermophilic bacteria and archae

Characterization of Technetium(VII) reduction by cell suspensions of thermophilic bacteria and archae

The synthesis and characterization of technetium and rhenium hydrazinopyrimidine chelate complexes

Organohydrazide chelate complexes of rhenium and technetium, which are defined as complexes containing a metal–nitrogen–nitrogen linkage, have been synthesized using 2-hydrazino-4-(trifluoromethyl)pyrimidine. The complexes all contain a chelating organohydrazide that forms a five-membered ring with the metal center. The chelate ring forms a delocalized π system and contributes to the unique electronic characteristics of these d 4 , octahedral complexes, which all have 1 H NMR spectra characteristic of diamagnetic complexes. An X-ray structural analysis of Tc III (NNC 4 H 2 N 2 CF 3 )(PPh 3 ) 2 Cl 2 1 was obtained. Complex 1, C 41 H 32 Cl 2 F 3 N 4 P 2 Tc, crystallizes in the triclinic space group P with a = 11.9193(3), b = 12.7026(3), c = 14.1335(3) A, α = 109.9320(10), β = 94.1250(10), γ = 105.0490(10)°, U = 1912.14(8) A 3 , Z = 2 and R = 0.0737 based on 3528 unique reflections. The complex Re III (NNC 4 H 2 N 2 CF 3 )(PPh 3 ) 2 Cl 2 2 was prepared and characterized. Both 1 and 2 contain a uninegative, chelating diazenido ligand. An X-ray structural analysis of Re III (NNC 4 H 2 N 2 CF 3 )(HNNC 4 H 2 N 2 CF 3 )(PPh 3 )Cl 2 3 was obtained. Complex 3, C 28 H 20 Cl 2 F 6 N 8 PRe, crystallizes in the monoclinic space group P2 1 /c with a = 10.1292(2), b = 14.92310(10), c = 20.6924(4) A, β = 92.4560(10)°, U = 3124.97(9) A 3 , Z = 4 and R = 0.0807 based on 4472 unique reflections. Complex 3 contains a monodentate, uninegative diazenido ligand and a chelating, α-nitrogen protonated, neutral diazene ligand.

Synthesis and characterization of technetium(V) and (VII) complexes with bidentate nitrogen donor ligands. X-ray molecular structures of tetrabutylammonium bis(1,2-diimidobenzene)oxotechnetium(V) and tris(1,2-diimidobenzene)technetium(VII) pertechnetate

The reaction of pertechnetate with 1,2-diaminobenzene (H 2pda) in the presence of the reducing agent sodium dithionite in alkaline aqueous solution led to the formation and isolation of (n-Bu 4N)[TcO(pda) 2] ( 1). If the reaction is performed without reducing agent in methanol, the green compound [Tc(pda) 3](TcO 4) ( 2) is formed. Both complexes are diamagnetic, and a single NH stretching frequency in both indicates that each pda ligand contains one hydrogen per nitrogen, and is dianionic. X-ray crystal structures of both compounds are also reported. Crystal data for complex 1, C 28H 48N 5OTc: orthorhombic, space group P2 12 12 1, a=11.644(3), b=15.303(4), c=16.950(5) Å and U=3020.3(1.5) Å 3 to give Z=4 for D calc=1.25 g cm −3. Crystal data for 2, C 18H 18N 6O 4Tc 2: orthorhombic, Pna2 1, a=13.869(4), b=12.799(5), c=10.851(3) Å and U=1926.2(1.1) Å 3 to give Z=4 for D calc=1.99 g cm −3. The structures have been solved by Patterson and Fourier methods and refined by least-squares methods to R=0.058 for 1 and 0.090 for 2. Complex 2 represents the first tris-bidentate cationic complex of technetium to be structurally characterized. Complex 1, with an unexpectedly low ν(TcO) of 891 cm −1, has a TcO bond distance of 1.668(7) Å, that is typical for monooxotechnetium(V) square-pyramidal complexes.

Synthesis and characterization of technetium(III) complexes with nitrogen heterocycles by oxygen atom transfer from oxotechnetium(V) cores. Crystal structures of mer-[Cl3(pic)3Tc] and mer-[Cl3(pic)(PMe2Ph)2Tc] (pic = 4-picoline). Electrochemical parameters for the reduction of TcII, TcIII, and TcIV

The combination of pyridine ligands, (OCl{sub 4}Tc){sup {minus}}, and O atom acceptors of different cone angles, such as PMe{sub 2}Ph or PPh{sub 3}, results in Tc{sup III} complexes that vary in the coordination of the phosphine ligand. The compounds mer(Cl{sub 3}(4-picoline){sub 3}Tc) and mer-(Cl{sub 3}(4-picoline)(PMe{sub 2}Ph){sub 2}Tc) have been obtained in good yield and have been characterized spectroscopically and by single-crystal x-ray diffraction. The crystal structure data are reported. Linear correlations of technetium reduction potentials in DMF with electrochemical ligand additivity parameters (E{sub L}'s) have been obtained for the Tc{sup II,I}, Tc{sup III,II}, and Tc{sup IV,III} couples. The slope and intercept (S{sub M}, I{sub M}) pairs for each technetium oxidation-reduction couple, respectively, are (1.39, {minus}2.07), (1.29, {minus}0.91), and (1.00, 0.65). 32 refs., 3 figs., 6 tabs.

ChemInform Abstract: Synthesis and Characterization of Technetium(III) and Technetium(II) Complexes with Mixed Phosphine‐, Chloride‐, and Nitrogen‐Donor Ligands. X‐Ray Crystal Structure of TcCl3(PPh3)(bpy).

ChemInformVolume 21, Issue 24 Organoelement Compounds ChemInform Abstract: Synthesis and Characterization of Technetium(III) and Technetium(II) Complexes with Mixed Phosphine-, Chloride-, and Nitrogen-Donor Ligands. X-Ray Crystal Structure of TcCl3(PPh3)(bpy). A. I. BREIKSS, A. I. BREIKSS Dep. Chem., MIT, Cambridge, MA 02139, USASearch for more papers by this authorT. NICHOLSON, T. NICHOLSON Dep. Chem., MIT, Cambridge, MA 02139, USASearch for more papers by this authorA. G. JONES, A. G. JONES Dep. Chem., MIT, Cambridge, MA 02139, USASearch for more papers by this authorA. DAVISON, A. DAVISON Dep. Chem., MIT, Cambridge, MA 02139, USASearch for more papers by this author A. I. BREIKSS, A. I. BREIKSS Dep. Chem., MIT, Cambridge, MA 02139, USASearch for more papers by this authorT. NICHOLSON, T. NICHOLSON Dep. Chem., MIT, Cambridge, MA 02139, USASearch for more papers by this authorA. G. JONES, A. G. JONES Dep. Chem., MIT, Cambridge, MA 02139, USASearch for more papers by this authorA. DAVISON, A. DAVISON Dep. Chem., MIT, Cambridge, MA 02139, USASearch for more papers by this author First published: June 12, 1990 https://doi.org/10.1002/chin.199024257Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume21, Issue24June 12, 1990 RelatedInformation

Synthesis and characterization of technetium(III) and technetium(II) complexes with mixed phosphine, chloride, and nitrogen-donor ligands. X-ray crystal structure of (2,2'-bipyridine)trichloro(triphenylphosphine)technetium

The synthesis and characterization of Tc(III) complexes of the types TcCl 3 (PMe 2 Ph)(LL) and TcCl 2 (PMe 2 Ph) 2 (LL) + , the neutral Tc(II) series TcCl 2 (PMe 2 Ph) 2 (LL), and the Tc(II) complex TcCl(PMe 2 Ph) 3 (bpy) + are reported (LL=2,2'-bipyridine (bpy), 1,10-phenanthroline (phen), 2,2'-bipyrimidine (bpm)). The electrochemistry of these complexes is discussed. An X-ray structure determination of TcCl 3 (PPh 3 )(bpy) was performed. Crystal data monoclinic, space group=P2 1 /n

Synthesis and characterization of technetium(V) complexes with N-(thiocarbamoyl)benzamidines. X-ray crystal structure of bis[N-(N,N-diethylthiocarbamoyl)benzamidinato]oxotechnetium(V) chloride, [TcO(et2tcb)2]Cl

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of technetium(V) complexes with N-(thiocarbamoyl)benzamidines. X-ray crystal structure of bis[N-(N,N-diethylthiocarbamoyl)benzamidinato]oxotechnetium(V) chloride, [TcO(et2tcb)2]ClU. Abram, R. Muenze, J. Hartung, L. Beyer, R. Kirmse, K. Koehler, J. Stach, H. Behm, and P. T. BeurskensCite this: Inorg. Chem. 1989, 28, 5, 834–839Publication Date (Print):March 1, 1989Publication History Published online1 May 2002Published inissue 1 March 1989https://doi.org/10.1021/ic00304a008RIGHTS & PERMISSIONSArticle Views81Altmetric-Citations44LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (771 KB) Get e-AlertsSupporting Info (1)»Supporting Information Supporting Information Get e-Alerts

ChemInform Abstract: Synthesis and Characterization of Technetium(V) Complexes with Amine, Alcoholate, and Chloride Ligands.

AbstractTwo general routes for the preparation of the title complexes are presented.

Synthesis and characterization of technetium(V) complexes with amine, alcoholate, and chloride ligands

Two general routes for the preparation of technetium complexes with aromatic amine, chloride, and alkoxide ligands are presented. The reactions of the tetrachlorooxotechnetate(V) anion of (n-Bu{sub 4}N)(TcOCl{sub 4}) with pyridine in tetrahydrofuran/alcohol solvent or of the dioxotetrakis(pyridine)technetium(V) cation of (TcO{sub 2}(py){sub 4})Cl with LiCl in sulfuric acid/alcohol both yield a neutral alkoxydichlorooxobis(pyridine)technetium(V) complex. The same isomer appears to result from either route. The analogous thiazole derivatives may be prepared in a like manner. The complex chloro(1,2-ethanediolato)oxo(1,10-phenanthroline)technetium(V), TcOCl(C{sub 2}H{sub 4}O{sub 2})(C{sub 12}H{sub 8}N{sub 2}), is prepared from (n-Bu{sub 4}N)(TcOCl{sub 4}) with 1,2-ethanediol and 1,10-phenanthroline in methanol. This complex was characterized by ir, uv/vis, and {sup 1}H and {sup 99}Tc NMR spectroscopies and by fast atom bombardment mass spectrometry. Further insight into the bonding in this complex comes from the single-crystal x-ray structure determination. The space group is monoclinic, P2{sub 1}/c, with a = 7.440 (2) {angstrom}, b = 8.928 (3) {angstrom}, c = 21.355 (4) {angstrom}, {beta} = 92.48 (2){degree}, V = 1417.2 (7) {angstrom}{sup 3}, and Z = 4. The structure was solved by standard methods and refined to R = 0.051 and R{sub w} = 0.036 based on 1859 reflections. The oxo and chloride ligands are mutually cis inmore » the highly distorted octahedral coordination sphere. The unusually long Tc-Cl bond length (2.418 (2) {angstrom}) is attributed to a trans influence exerted by the coordinated diolate. This effect combined with short lengths for the C-C bond (1.491 (1) {angstrom}) and for the O-Tc-O linkage (1.924 (4), 1.902 (3) {angstrom}) suggests partial multiple bonding between the technetium and the diolate. 38 references, 2 figures, 3 tables.« less

ChemInform Abstract: Synthesis and Characterization of Technetium(V) Complexes (V) with Tetradentate Schiff Base Ligands Derived from S‐Methyldithiocarbazate.

ChemInformVolume 19, Issue 3 Organoelement Compounds ChemInform Abstract: Synthesis and Characterization of Technetium(V) Complexes (V) with Tetradentate Schiff Base Ligands Derived from S-Methyldithiocarbazate. J. G. H. DU PREEZ, J. G. H. DU PREEZ Uranium Chem. Res. Unit., Univ. Port Elizabeth, Port Elizabeth 6000, S. Afr.Search for more papers by this authorT. I. A. GERBER, T. I. A. GERBER Uranium Chem. Res. Unit., Univ. Port Elizabeth, Port Elizabeth 6000, S. Afr.Search for more papers by this authorO. KNOESEN, O. KNOESEN Uranium Chem. Res. Unit., Univ. Port Elizabeth, Port Elizabeth 6000, S. Afr.Search for more papers by this author J. G. H. DU PREEZ, J. G. H. DU PREEZ Uranium Chem. Res. Unit., Univ. Port Elizabeth, Port Elizabeth 6000, S. Afr.Search for more papers by this authorT. I. A. GERBER, T. I. A. GERBER Uranium Chem. Res. Unit., Univ. Port Elizabeth, Port Elizabeth 6000, S. Afr.Search for more papers by this authorO. KNOESEN, O. KNOESEN Uranium Chem. Res. Unit., Univ. Port Elizabeth, Port Elizabeth 6000, S. Afr.Search for more papers by this author First published: January 19, 1988 https://doi.org/10.1002/chin.198803267AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume19, Issue3January 19, 1988 RelatedInformation

Synthesis and characterization of technetium(V) complexes with tetradentate Schiff base ligands derived from S-methyldithiocarbazate

Synthesis and characterization of technetium(V) complexes with tetradentate Schiff base ligands derived from S-methyldithiocarbazate

Synthesis and characterization of technetium-(IV) and -(III) complexes with bidentate Schiff bases. X-Ray molecular structure of chloro-(dimethylphenylphosphine)bis(N-phenylsalicylideneiminato)technetium(III)

The complexes [TcCl4(HL)2] and [TcCl3L(PPh3)][HL =N-methylsalicylideneimine or N-phenylsalicylideneimine (Hpsal)] of the long-lived isotope technetium-99 were synthesized from [TcCl4(PPh3)2], while the complexes [TcClL2(PMe2Ph)] were obtained through the reduction of the oxotechnetium(V) complexes [TcO(Cl)L2] with PMe2Ph. The crystal structure of the complex [TcCl(psal)2(PMe2Ph)] has been determined: a= 9.500(4), b= 10.596(4), c= 31.000(9)A, β= 95.59(5)°, monoclinic, space group P21/c, and Z= 4. The co-ordination around Tc is approximately octahedral with the two chelate ligands mutually orthogonal, one ligand bridging two adjacent positions in the plane normal to the Tc–P bond and the other in the plane normal to the Tc–Cl bond. The phosphorus atom of PMe2Ph is in a position trans to the aldimine nitrogen of one of the psal ligands, while the chlorine atom is trans to the nitrogen atom of the second psal, leaving the two phenolic oxygens in trans positions to each other.

Synthesis and characterization of technetium(V) complexes with tridentate schiff base ligands. X-ray crystal structure of chloro[N-(2-hydroxyphenyl)salicylideneiminato]oxotechnetium(V)

Five-coordinate technetium(V) complexes of the form TcO(L)Cl where L is one of the two tridentate Schiff base ligands N-(2-oxidophenyl)salicylideneiminate or N-(2-mercaptophenyl)salicylideneiminate have been synthesized and characterized. These neutral complexes precipitate from methanol upon reaction of the Schiff base ligand with TcOCl 4 −. A single crystal X-ray structure determination shows that the chloro [[N-(2-oxidophenyl)salicylideneiminato](2−)-N,O,O′]oxotechnetium(V) complex, [TcO(C 13H 9NO 2)Cl], formula weight 362, has a distorted square pyramidal coordination geometry with the oxo ligand in the axial position. The steric requirements of the oxo group cause the Tc atom to be displayed 0.67 Å out of the mean equatorial plane of the other four donor atoms. This complex crystallizes in the monoclinic space group P2 1/a with a = 13.423(6) Å, b = 12.570(5) Å, c = 7.769(3) Å, β = 106.53(5)°, V = 1256.7(9) Å 3, and Z = 4. The structure has been refined to R = 0.047 for 1775 observed reflections.

Synthesis and characterization of technetium(V) 8-quinolinolates. X-ray crystal structure of cis-chlorobis(2-methyl-8-quinolinolato)oxotechnetium(V)

Technetium(V) complexes of 8-quinolinolates of the form TcOL/sub 2/X (L = 8-quinolinolate and its 5,7-dichloro, 5,7-dibromo, 5-nitro, and 2-methyl derivatives; X = Cl, Br) have been synthesized and characterized. These neutral species precipitate from methanol after reaction of the quinolinolate ligand with TcOX/sub 4//sup -/. High performance liquid chromatography analyses of the complexes show that the halide ligand of cis-TcO(8-quinolinolate)/sub 2/X is susceptible to solvolysis in methanol, forming what is believed to be TcOL/sub 2/(OCH/sub 3/); when X is Cl, the specific first-order rate constant governing this process is 1 X 10/sup -4/s/sup -1/ (25/sup 0/C, no ionic strength, in methanol). A single-crystal X-ray structure determination shows that the chlorobis(2-methyl-8-quinolinolato)oxotechnetium(V) complex, TcO(CH/sub 3/C/sub 9/H/sub 5/NO)/sub 2/Cl, formula weight 467, has a distorted-octahedral coordination geometry, with the chloro and oxo ligands in a cis configuration. A oxo-induced structural trans effect characteristic of M=O moieties is manifested in a lengthening of the Tc-O bond trans to the yl oxygen and a displacement of the Tc atom out of the mean equatorial plane. This complex crystallizes in the triclinic centrosymmetric space group P anti-1 with a = 7.693 (2) A, b = 9.337 (2) A, c = 12.739 (3) A, ..cap alpha.. =more » 86.52 (2)/sup 0/, ..beta.. = 85.99 (2)/sup 0/, ..gamma.. = 84.12 (2)/sup 0/, and V = 907 (2) A/sup 3/, with Z = 2, for 2882 observed reflections with I/sub 0/ greater than or equal to 2sigma(I). Structural aspects of metal complexes containing 8-quinolinolate ligands are discussed. 32 references, 4 figures, 6 tables.« less

Preparation and characterization of technetium(IV)-complexes with diethylenetriaminepentaacetic acid and ethylenediaminetetraacetic acid as ligands

Technetium chelates with DTPA and EDTA as ligands were prepared via ligand exchange of K 2TcBr 6 and the appropriate ligand in aqueous solution. According to elemental analysis and physicochemical characterization including i.r., u.v./vis spectrophotometry, magnetic measurements and determination of the protonation characteristics 1:1 complex compounds having the formulae H 3 [TcODTPA]·2H 2O, K 4H 2 [Tc 2O(DTPA) 2]·4H 2O and H 2 [TcOEDTA]·3H 2O were confirmed.

Technetium cyanide chemistry: synthesis and characterization of technetium(III) and -(V) cyanide complexes

Several new technetium cyanide complexes have been prepared and characterized. The reaction of ammonium hexaiodotechnetate(IV) with potassium cyanide in refluxing aqueous methanol under nitrogen yields potassium heptacyanotechnetate(III) dihydrate, K/sub 4/Tc(CN)/sub 7/.2H/sub 2/O (1). Infrared and Raman measurements indicate that 1 has a pentagonal bipyramidal structure (D/sub 5h/) in both solid and solution. Aqueous solutions of 1 are air sensitive, decomposing to potassium oxopentacyanotechnetate(V) tetrahydrate, K/sub 2/TcO(CN)/sub 5/.4H/sub 2/O (2). This species can also be prepared from the reaction of TcO/sub 2/.xH/sub 2/O with hot aqueous potassium cyanide solutions. Hydrolysis of 2 in water yields potassium trans-dioxo-tetracyanotechnetate(V), K/sub 3/TcO/sub 2/(CN)/sub 4/ (3). Preparation of 3 can also be achieved from the treatment of (TcO/sub 2/(Py)/sub 4/)ClO/sub 4/.2H/sub 2/O with aqueous potassium cyanide. Infrared and Raman measurements on 3 are consistent with the proposed trans-dioxo (D/sub 4h/) structure. Reaction of the oxotetrachlorotechnetate(V) anion, TcOCl/sub 4/, with potassium cyanide in methanol produces trans-oxomethoxytetracyanotechnetate(V). (TcO(OMe)(CN)/sub 4/) (4). The full details of the synthesis and characterization of these interesting technetium(III) and -(V) complexes, as well as observations on the infrared and Raman spectra of trans-dioxo metal complexes and the hydrolysis of species 2, are presented.