Burkhard Niemer

Methods for the Synthesis of μ‐Hydrocarbon Transition Metal Complexes without Metal–Metal Bonds

Wolfgang Beck, Burkhard Niemer, Michael Wieser · Angewandte Chemie International Edition in English · 1993 · 298 citations

Natural Sciences, Chemistry, Materials Science +14

New bimetallic hydrocarbon-bridged complexes by nucleophilic attack of carbonylmetallates to coordinated unsaturated hydrocarbons

Wolfgang Beck, Burkhard Niemer, Josef Bremair et al. · Journal of Organometallic Chemistry · 1989 · 38 citations

Natural Sciences, Chemistry, Inorganic Chemistry +13

Reaction pathways in organometallic chemical vapor deposition(OMCVD)

Alfred A. Zinn, Burkhard Niemer, Herbert D. Kaesz · Advanced Materials · 1992 · 36 citations

Natural Sciences, Chemistry, Materials Science +12

Hydrocarbon‐bridged Metal Complexes, XXI. – Addition of Tetracarbonylosmate and ‐ruthenate to Coordinated Unsaturated Hydrocarbons: Trinuclear Complexes with two σ,α‐Allyl, Methylallyl, Cyclohexadiene, Cycloheptadiene, Cyclohexadienyl, Cycloheptatrien, and “Thiophene” Bridges The addition of organometallic nucleophiles [M(CO)₄]^2‐ (M = Os, Ru) to [(Cp)(ON)(OC)Mo(allyl)]⁺, [Cp(OC)₂Mo(butadiene)]⁺, [(OC)₃Fe(cycloheptadienyl)]⁺, [(OC)₃Fe(cycloheptadienyl)]⁺, [(OC)₃Mn(benzene)]⁺, [(OC)₃Mn(thiophene)]⁺, [(OC)₃‐Mo(cycloheptatrienyl)]⁺ leads to the heterotrimetallic η¹:η²‐, η¹:η³‐, η¹:η⁴‐, η¹:η⁵‐, η¹:η⁶‐hydrocarbon‐bridged complexes 1 ‐ 7. The structures of <i>cis</i>‐(OC)₄Os[(μ‐η¹:η⁴‐C₇H₉)Fe(CO)₃]₂ (4), <i>cis</i>‐(OC)₄Os[(μ‐η¹:⁵‐C₆H₆‐Mn(CO)₃]₂ (6), and <i>cis</i>‐(OC)₄Os‐[μ‐η¹:η⁶‐C₇H₇‐Mo(CO)₃]₂ (7b) have been determined by X‐ray analysis. The fluxional behaviour of 6 in solution has been studied in a temperature range from – 70 to +60°C. The comparison of observed and calculated ¹H‐NMR data indicates a 1,2‐shift mechanism (ΔG⁺ = 49 kJ/mol).

Burkhard Niemer, Josef Breimair, Thomas Völkel et al. · Chemische Berichte · 1991 · 32 citations

Natural Sciences, Chemistry, Inorganic Chemistry +12

Addition von Pentacarbonylrhenat an koordiniertes Benzol: Ein σ,π‐verbrückter, dynamischer Cyclohexadienyl‐Komplex, (OC)₅Re‐μ‐(η¹:η⁵‐C₆H₆Mn(CO)₃

Burkhard Niemer, Manfred Steimann, Wolfgang Beck · Chemische Berichte · 1988 · 26 citations

Natural Sciences, Chemistry, Crystal Structure +11