Röntgenstrukturanalyse von μ‐Distickstoff‐bis[dicarbonyl‐η⁵‐methylcyclopentadienylmangan], [(η⁵‐C₅H₄CH₃)Mn(CO)₂]₂ (μ‐N₂)

Abstract

Die Kristall‐ und Molekülstruktur des N2‐verbrückten Zweikernkomplexes [(η5C5H4CH3)Mn(CO)2]2 (μ‐N2) wurde mittels Röntgenstrukturanalyse bestimmt. In der zentrosymmetrischen Spezies wurde mit 111,8 pm für den NN‐Abstand der bisher kleinste Wert für einen Brückendistickstoff‐Komplex ermittelt.

Transition metal dinitrogen complexes supported by a versatile monoanionic [N2P2] ligand

“…The increased activation of the N-N bond seen in the X-ray structure of 9 is also reflected in the Raman spectrum where the n N-N is observed at 1685 cm 21 compared to 1975 cm 21 previously reported for {g 5 -C 5 H 4 CH 3 Mn(CO) 2 } 2 (m-N 2 ). 9 The solution magnetic moment (8.7 m B ) is very close to the spin-only value of 8.9 m B for eight unpaired electrons.…”

“…The N-N bond length (1.208(6) s) is significantly longer than the distance reported previously for {g 5 -C 5 H 4 CH 3 Mn(CO) 2 } 2 -(m-N 2 ) 9 (1.118(7) s) likely due to increased p back-bonding into the p* orbital of the N 2 moiety as a result of the low coordination number of 9 and the omission of other p accepting ligands. The increased activation of the N-N bond seen in the X-ray structure of 9 is also reflected in the Raman spectrum where the n N-N is observed at 1685 cm 21 compared to 1975 cm 21 previously reported for {g 5 -C 5 H 4 CH 3 Mn(CO) 2 } 2 (m-N 2 ).…”

“…Hydrogen atoms, iso-propyl methyl and tert-butyl methyl groups have been omitted for clarity. The prime character (9) in the atom labels indicates that these atoms are at equivalent positions (2 2 x, 2y, 2 2 z). transition metal complexes in a variety of coordination geometries.…”

Reactions of TpRe(CO)2(THF) with Aromatic Molecules (Tp = Hydridotris(pyrazolyl)borate)

“…A search of the Cambridge Crystallographic Database revealed no other structurally characterized dinitrogen-bridged dirhenium complexes. However, solid-state structures of rhenium dinitrogen monomers have been reported . Each rhenium center is in a slightly distorted octahedral environment, and the Tp ligands are in an anti orientation.…”

Synthesis and characterization of manganese and iron complexes supported by multidentate [N2P2] ligands

“…Complex 7 represents only the second crystallographically characterized bridging dinitrogen manganese compound. The N-N bond length in 7 is 1.208(6) A ˚, significantly longer than the distance reported for {h 5 44 (1.118(7) A ˚). The elongation of the N-N bond is likely due to 5.…”