Paramagnetic hydride complexes of niobium(IV) and tantalum(IV)

Luetkens, Melvin L.; Elcesser, Wendy L.; Huffman, John C.; Sattelberger, Alfred P.

doi:10.1021/ic00180a017

Cited by 42 publications

(30 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reverse process, namely the oxidative addition of H2 to a stable paramagnetic complex, had been established for the 15-electron complexes MCl2L4 (M = Nb, Ta; L = PMe3 or L2 = dmpe). 7 It should also be mentioned that an H2 elimination was proposed to occur from Cp2NbH2 (generated in situ by H atom abstraction from Cp2NbH3), to generate a poorly characterized 15-electron Cp2Nb transient, which was observed only as a fleeting intermediate by EPR spectroscopy. 117 Proposals for the intimate mechanism of this transformation can be extrapolated from the well-studied diamagnetic counterparts as shown in Scheme 4.…”

Section: Methodsmentioning

confidence: 99%

Stable Paramagnetic Half-Sandwich Mo(V) and W(V) Polyhydride Complexes. Structural, Spectroscopic, Electrochemical, Theoretical, and Decomposition Mechanism Studies of [Cp*MH₃(dppe)]⁺ (M = Mo, W)

et al. 1999

View full text Add to dashboard Cite

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

show abstract

Section: Methodsmentioning

confidence: 99%

Stable Paramagnetic Half-Sandwich Mo(V) and W(V) Polyhydride Complexes. Structural, Spectroscopic, Electrochemical, Theoretical, and Decomposition Mechanism Studies of [Cp*MH₃(dppe)]⁺ (M = Mo, W)

et al. 1999

View full text Add to dashboard Cite

show abstract

“…Previous work has revealed some interesting cluster-assembling and extension reactions for group 5 metal atoms with oxidation states between 2 and 3, such as MX3L3-+M2X6L4 (L=phosphines) [16], M2L3X6--+ [M2L3X212X (L=THT) [17], and M2XvL2-* M3ClmL3-(L = phosphines) [3]. In these the halides have shown a strong tendency to become bridging or even capping ligands.…”

Section: Chemistrymentioning

confidence: 99%

A new member of the Nbn(?3-X)n?2(?-X)nLn+6 (n > 2) cluster family: Nb4Cl10(PEt3)4(H2NPh)2. Synthesis, structure, and relationship to other members

Cotton

Shang

1994

J Clust Sci

View full text Add to dashboard Cite

“…The resultant 17-electron MOI2H2L4 complexes have been completely characterized by IR and electron spin resonance spectroscopies and x-ray crystallography. 84 We subsequently discovered that one of these complexes, dodecahedral TaCl 2 H2(PMe 3 )4. decomposes in 80°C cyclohexane to a quadruply hydrogen-bridged tantalum(IV) dimer [TaCl 2 (PMe3)2] 2 (/i-H)4 and that it can be reduced by Eq. ( 1 The IR spectrum of 1 (Nujol mull) shows a strong metal hydride stretch at 1662 cm""', which shifts to 1191 cm" 1 in the IR spectrum of TaClD 2 (PMe 3 j 4 (v Ta _ H /VTU-D = 1.40).…”

Section: Berkelium Chemistry In Complexing Aqueousmentioning

confidence: 99%

Isotope and Nuclear Chemistry Division annual report FY 1989, October 1988--September 1989

Heiken¹,

Minahan²

1990

View full text Add to dashboard Cite

The Medical (Udioisotopes Research Program is investigating methods that will allow us to label molecules, which can then be used to image, diagnose, and treat various diseases. The two major components of this project are to develop labeling chemistry and to study targeting techniques. Articles relate*! to this research can be round in Sees. 4 and I Oof this report Right: We use cell-culture techniques to evaluate the ability oflymph nodes (red medium) and tumor cells (orange medium) to concentrate various radiopharmaceuticals.Below: The gamma-camera terminal displays the uptake of a radiophamaceutical in tissue. In this example, color gradation corresponds to the concentration of radiopharmaceutical (white > red > yellow > blue) in the heart.Above: We usa computer modeling to design specific chelating agents (metal-binding molecules); these structures are easily examined on the terminal. In this model, nitrogen atoms (blue) are the binding sites and are held in rigid conformation by carbon atoms (green); hydrogen atoms are shown in white. --/ , --J-)tope to specific tumor sites. .""." chromotograplw is used to separate the orange metalated porphyrin that contains Lu from the green unmetalated form.Front Cover: This photo is a gamma-camera image; the subject, an anesthetized rat, had been injected with a compound to which a radioisotope had been attached, or "labeled." In the initial steps of this experiment, the front paws of the rat had been injected with a chemical that caused an inflammation. The 67 Cu-labeled porphyrin ""•; theqjnjected. The majority of the labeled porphyrin is localized le jjfontJjws^pm^^tSjty is also evident in the liver. (Blue cafes tirearejSjjJf TOftflit concentration of radiopharmaceutical, ana yefaft wdicBwrrwcftsrate concentration, and green areas have the least concentration.

show abstract

Paramagnetic hydride complexes of niobium(IV) and tantalum(IV)

Cited by 42 publications

References 15 publications

Stable Paramagnetic Half-Sandwich Mo(V) and W(V) Polyhydride Complexes. Structural, Spectroscopic, Electrochemical, Theoretical, and Decomposition Mechanism Studies of [Cp*MH₃(dppe)]⁺ (M = Mo, W)

Stable Paramagnetic Half-Sandwich Mo(V) and W(V) Polyhydride Complexes. Structural, Spectroscopic, Electrochemical, Theoretical, and Decomposition Mechanism Studies of [Cp*MH₃(dppe)]⁺ (M = Mo, W)

A new member of the Nbn(?3-X)n?2(?-X)nLn+6 (n > 2) cluster family: Nb4Cl10(PEt3)4(H2NPh)2. Synthesis, structure, and relationship to other members

Isotope and Nuclear Chemistry Division annual report FY 1989, October 1988--September 1989

Contact Info

Product

Resources

About

Paramagnetic hydride complexes of niobium(IV) and tantalum(IV)

Cited by 42 publications

References 15 publications

Stable Paramagnetic Half-Sandwich Mo(V) and W(V) Polyhydride Complexes. Structural, Spectroscopic, Electrochemical, Theoretical, and Decomposition Mechanism Studies of [Cp*MH3(dppe)]+ (M = Mo, W)

Stable Paramagnetic Half-Sandwich Mo(V) and W(V) Polyhydride Complexes. Structural, Spectroscopic, Electrochemical, Theoretical, and Decomposition Mechanism Studies of [Cp*MH3(dppe)]+ (M = Mo, W)

A new member of the Nbn(?3-X)n?2(?-X)nLn+6 (n > 2) cluster family: Nb4Cl10(PEt3)4(H2NPh)2. Synthesis, structure, and relationship to other members

Isotope and Nuclear Chemistry Division annual report FY 1989, October 1988--September 1989

Contact Info

Product

Resources

About

Stable Paramagnetic Half-Sandwich Mo(V) and W(V) Polyhydride Complexes. Structural, Spectroscopic, Electrochemical, Theoretical, and Decomposition Mechanism Studies of [Cp*MH₃(dppe)]⁺ (M = Mo, W)

Stable Paramagnetic Half-Sandwich Mo(V) and W(V) Polyhydride Complexes. Structural, Spectroscopic, Electrochemical, Theoretical, and Decomposition Mechanism Studies of [Cp*MH₃(dppe)]⁺ (M = Mo, W)