Trichloro-mono- β -diketonato oxorhenium(V) complexes: synthesis, characterization and crystal structure

Abstract

Oxorhenium(V) complexes of -diketonate systems have been synthesized and isolated in pure form. The red complexes n-Bu 4 N[ReO(R 1 COCHCOR 2 )Cl 3 ] (acac, R 1 ¼R 2 ¼CH 3 ; bzac, R 1 ¼CH 3 and R 2 ¼C 6 H 5 ; bzbz, R 1 ¼R 2 ¼C 6 H 5 ) have been characterized by elemental analyses, spectroscopic and other physico-chemical tools. One complex, n-Bu 4 N[ReO(bzbz)Cl 3 ] (1c) has been subjected to single-crystal X-ray analysis. In the structure of the anion, the metal has a six-coordinate octahedral environment in which the bidentate -diketone ligand is cis and trans to the terminal oxygen.

Complexes of Technetium(V) and Rhenium(V) with β-Diketonates

“…They are generated in good yields from reactions between (NBu 4 )[ReOCl 4 ] and the respective diketones. 13 This surprising lack of knowledge encouraged us to undertake some more studies with rhenium and technetium compounds. These two central elements of the periodic table of elements can stabilize complexes with a large number of oxidation states, and deeper insight into their chemistry with such fundamental ligands like β-diketones is of general interest.…”

“…19 F NMR (CDCl 3 ): δ −72.3 (s, 3F, CF 3 ), −73.7 (s, 3F, CF 3 ). 13 C NMR (CDCl 3 ): δ 182.8 (d, J = 37 Hz, 1C, CO), 179.3 (d, J = 37 Hz, 1C, CO), 114.2 (q, J = 280 Hz, 1C, CF 3 ), 113.7 (q, J = 280 Hz, 1C, CF 3 ), 84.5 (s, 1C, CH), 60 (s, 4C, CH 2 ), 24.4 (s, 4C, CH 2 ), 20 (s, 4C, CH 2 ), 13.8 (s, [Tc(NPhCF 3 )Cl 3 (PPh 3 ) 2 ]. NH 4 TcO 4 (72 mg, 0.4 mmol) was dissolved in 40 mL of MeOH.…”

“…31 P NMR (CDCl 3 ): δ −0,5 (s), −4.2 (s). 13 [Re(NPhF)Cl 2 (PPh 3 )(naphtfac)]. [Re(NPhF)Cl 3 (PPh 3 ) 2 ] (186 mg, 0.2 mmol) was suspended in 5 mL of toluene.…”

A selenium-bonded oxorhenium(V) complex: solvothermal synthesis, structural characterization, and electrochemical behavior

“…As a continuation of our interest in new oxorhenium(V) complexes of different polydentate chelators [12][13][14][15][16] and considering the above synthetic strategy here, a new seleno-bonded ternary mononuclear oxorhenium(V) complex of 2,2 0 -selenobis(4,6-di-tert-butylphenolate) (L 1 ) and in situ formed 2-selenochloromethyl-4,6-di-tert-butylphenolate (L 2 ) formulated as [ReO(L 1 )(L 2 )] has been synthesized by a solvothermal reaction and characterized using physicochemical and spectroscopic tools. The detailed structure has been established by X-ray crystallography.…”

Development of a highly selective cell-permeable ratiometric fluorescent chemosensor for oxorhenium(v) ion

“…[6][7][8][9] As a consequence, the development of fluorescent metal ion and anion [10][11][12] sensors is a topic of current impetus. [13][14][15][16] Nowadays, coordination chemistry of rhenium 17,18 continues to be a topic of intensive research, mainly due to the variety of applications of rhenium complexes, ranging from medicinal chemistry [19][20][21][22][23][24] and catalysis [25][26][27] to photophysics 28,29 and materials chemistry. 30 The main type of rhenium complexes labeled with b-emitting isotopes 186 Re/ 188 Re used in nuclear medicine for systematic radiotherapy of abnormal tissues or in the treatment of cancer 31,32 is oxorhenium(V); 33 and though rhenium is not a biometal, as an element in the periodic group next to that of molybdenum and tungsten, transfer reactions involving Re¼O are of value as potential models.…”