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Kohlíčková, M.; Jedináková-Křížová, V.

doi:10.1023/a:1006736822008

Cited by 10 publications

(8 citation statements)

References 6 publications

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“…Given the product ratio [8] ∞ /[7] ∞ ) 9.0 and K 56 ) 0.11, we conclude that k 58 = k 67 . We next examine whether this finding is reasonable in light of other available data.…”

mentioning

confidence: 83%

“…The β-emitting isotopes 186 Re and 188 Re form the basis for radiopharmaceuticals. [5][6][7][8][9] Furthermore, oxorhenium(V) compounds are active catalysts for oxygen atom transfer (OAT) reactions. We have identified certain oxorhenium(V) compounds that catalyze OAT.…”

Section: Introductionmentioning

confidence: 99%

“…The impetus for this research lies not only in fundamental issues of structure and mechanism but also to applications in nuclear medicine. The β-emitting isotopes 186 Re and 188 Re form the basis for radiopharmaceuticals. − Furthermore, oxorhenium(V) compounds are active catalysts for oxygen atom transfer (OAT) reactions. We have identified certain oxorhenium(V) compounds that catalyze OAT.…”

Section: Introductionmentioning

confidence: 99%

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Isomer Formation and Other Issues in the Substitution Reactions of Oxorhenium(V) Complexes of 2,2‘-Bipyridine and Related Ligands

et al. 2001

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Two new oxorhenium(V) compounds were prepared and characterized: MeReO(mtp)(Me(2)Bpy) and MeReO(mtp)(dppb), where mtpH(2) is 2-(mercaptomethyl)thiophenol, Me(2)Bpy is 4,4'-dimethyl-2,2'-bipyridine, and dppb is 1,2-(Ph(2)P)(2)C(6)H(4). The more stable geometric isomer of MeReO(mtp)X forms MeReO(mtp)Y (X, Y = PR(3), NC(5)H(4)R) in two steps, both of which show a first-order dependence on [Y], proceeding through the metastable geometric isomer MeReO(mtp)Y. When Y = PR(3), no MeReO(mtp)Y was detected at equilibrium; with NC(5)H(4)R, however, both isomers were detected. The values of K(PyPy) were 8.5-9.8, largely irrespective of R; for NC(5)H(5), DeltaH degrees = -4.47 +/- 0.29 kJ and DeltaS degrees = 3.9 +/- 1.0 J K(-1). For the more symmetric edt ligand, geometric isomers do not exist, but enantiomers do. The rate of racemization of MeReO(edt)(NC(5)H(4)R) was proportional to [Py]. Values of k(rac) for 16 compounds span the range 135-370 L mol(-1) s(-1) in C(6)H(6) at 25 degrees C (rho = -0.39 +/- 0.07). In toluene-d(8), k(rac) for 4-picoline has DeltaH = 28.9 +/- 0.4 kJ, DeltaS() = -103.6 +/- 0.9 J K(-1). A common mechanism applies to ligand substitution (mtp) and racemization (edt). MeReO(dithiolate)Py complexes react with Bpy, Me(2)Bpy, Phen, and Me(2)Phen to form six-coordinate chelates, with rate constants 0.024-0.74 L mol(-1) s(-1) at 25 degrees C, some 10(3) times smaller than with pyridines, no doubt owing to the bulk of the bidentates. Values of DeltaS are -86 to -138 J K(-1), reflecting substantial orientational barriers as well as the inherent contribution of the associative mechanism. The product is MeReO(mtp)(Me(2)Bpy). The formation of the metastable isomer is consistent with the mechanism assigned to the ligand substitution and racemization reactions. Such compounds, once formed, no longer participate in ligand substitution reactions at reasonable rates. The formation of the metastable isomer is consistent with the mechanism assigned to the ligand substitution and racemization reactions.

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“…Given the product ratio [8] ∞ /[7] ∞ ) 9.0 and K 56 ) 0.11, we conclude that k 58 = k 67 . We next examine whether this finding is reasonable in light of other available data.…”

mentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Isomer Formation and Other Issues in the Substitution Reactions of Oxorhenium(V) Complexes of 2,2‘-Bipyridine and Related Ligands

et al. 2001

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“…The chemistry of technetium and rhenium has been well documented. , Technetium and rhenium exhibit considerable chemical diversity, with complexes in oxidation states 1− to 7+ having been reported . This chemical versatility is reflected in a number of robust chemical cores that have been investigated for applications to radiopharmaceutical development. , The most extensively developed chemistry is that of the technetium and rhenium complexes of the metal−oxo {M V O} 3+ core .…”

Section: Introductionmentioning

confidence: 99%

Developing the {M(CO)₃}⁺ Core for Fluorescence Applications: Rhenium Tricarbonyl Core Complexes with Benzimidazole, Quinoline, and Tryptophan Derivatives

et al. 2006

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Tridentate ligands derived from benzimidazole, quinoline, and tryptophan have been synthesized, and their reactions with [NEt4]2[Re(CO)3Br3] have been investigated. The complexes 1-4 and 6 and 7 exhibit fac-{Re(CO)3N3} coordination geometry in the cationic molecular units, while 5 exhibits fac-{Re(CO)3N2O} coordination for the neutral molecular unit, where N3 and N2O refer to the ligand donor groups. The ligands bis(1-methyl-1H-benzoimidazol-2-ylmethyl)amine (L1), [bis(1-methyl-1H-benzoimidazol-2-ylmethyl)amino]acetic acid ethyl ester (L2), [bis(1-methyl-1H-benzoimidazol-2-ylmethy)amino]acetic acid methyl ester (L3), [bis(quinolin-2-ylmethyl)amino]acetic acid methyl ester (L4), 3-(1-methyl-1H-indol-3-yl)-2-[(pyridin-2-ylmethyl)amino]propionic acid (L5), 2-[bis(pyridin-2-ylmethyl)amino]-3-(1-methyl-1H-indol-3-yl)propionic acid (L6), and 2-[bis(quinolin-2-ylmethyl)amino]-3-(1-methyl-1H-indol-3-yl)propionic acid (L7) were obtained in good yields and characterized by elemental analysis, 1D and 2D NMR, and high-resolution mass spectrometry (HRMS). The rhenium complexes were obtained in 70-85% yields and characterized by elemental analysis, 1D and 2D NMR, HRMS, IR, UV, and luminescence spectroscopy, as well as X-ray crystallography for [Re(CO)3(L1)]Br (1), {[Re(CO)3(L2)]Br}2.NEt4Br . 8.5H2O (3(2).NEt4Br . 8.5H2O), [Re(CO)3(L4)]Br (4), and [Re(CO)3(L6)]Br (6). Crystal data for C21H19BrN5O3Re (1): monoclinic, P2(1)/c, a = 13.1851(5) A, b = 16.1292(7) A, c = 10.2689(4) A, beta = 99.353(1) degrees , V = 2154.8(2) A3, Z = 4. Crystal data for C56H73Br3N11O18.50 Re2 (3(2).NEt4Br . 8.5H2O): monoclinic, C2/c, a = 34.7760(19) A, b = 21.1711(12) A, c = 20.3376(11) A, beta = 115.944(1) degrees , V = 13464.5(1) A3, Z = 8. Crystal data for C26H21BrN3O5Re (4): monoclinic, P2(1)/c, a = 16.6504(6) A, b = 10.1564(4) A, c = 14.6954(5) A, beta = 96.739(1) degrees , V = 2467.9(2) A3, Z = 4. Crystal data for C27H24BrN4O5Re (6): monoclinic, P2(1), a = 8.7791(9) A, b = 16.312(2) A, c = 8.9231(9) A, beta = 90.030(1) degrees , V = 1277.8(2) A3, Z = 2.

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“…Thiophosphines have also been found to be effective chelating agents 148 for the labelling of rhodium radiopharmaceuticals. Substituted diethylenetriaminepentaacetic acids 109 and pyranone derivatives 149 have been used to label monoclonal antibodies and leucocytes with 111 In.…”

Section: Technetium ( 99m Tc)mentioning

confidence: 99%

27 Radiochemistry

Urch¹

2000

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

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Untitled

Cited by 10 publications

References 6 publications

Isomer Formation and Other Issues in the Substitution Reactions of Oxorhenium(V) Complexes of 2,2‘-Bipyridine and Related Ligands

Isomer Formation and Other Issues in the Substitution Reactions of Oxorhenium(V) Complexes of 2,2‘-Bipyridine and Related Ligands

Developing the {M(CO)₃}⁺ Core for Fluorescence Applications: Rhenium Tricarbonyl Core Complexes with Benzimidazole, Quinoline, and Tryptophan Derivatives

27 Radiochemistry

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Untitled

Cited by 10 publications

References 6 publications

Isomer Formation and Other Issues in the Substitution Reactions of Oxorhenium(V) Complexes of 2,2‘-Bipyridine and Related Ligands

Isomer Formation and Other Issues in the Substitution Reactions of Oxorhenium(V) Complexes of 2,2‘-Bipyridine and Related Ligands

Developing the {M(CO)3}+ Core for Fluorescence Applications: Rhenium Tricarbonyl Core Complexes with Benzimidazole, Quinoline, and Tryptophan Derivatives

27 Radiochemistry

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Developing the {M(CO)₃}⁺ Core for Fluorescence Applications: Rhenium Tricarbonyl Core Complexes with Benzimidazole, Quinoline, and Tryptophan Derivatives