A Proton Magnetic Resonance Investigation of Molecular Motion and Phase Transition in Solid Diamminesilver Dinitroargentate, [Ag(NH3)2]Ag(NO2)2

1978 ◽  
Vol 82 (6) ◽  
pp. 602-606 ◽  
Author(s):  
H. M. Maurer ◽  
J. L. Ragle ◽  
Alarich Weiss
Keyword(s):  
Phase Transition ◽  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Molecular Motion ◽  
Resonance Investigation ◽  
Magnetic Resonance Investigation

Protonenresonanz-spektroskopische Untersuchungen am Chlor-, Brom- und Methylcyclobutadieneisentricarbonyl / A Proton Magnetic Resonance Investigation on Chloro-, Bromo- and Methyl-cyclobutadiene-irontricarbonyl

1974 ◽  
Vol 29 (3-4) ◽  
pp. 219-227 ◽  
Author(s):  
Hans Albert Brune ◽  
Hans Hanebeck ◽  
Gernot Horlbeck ◽  
Hans Hüther
Keyword(s):  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Electron Distribution ◽  
Membered Ring ◽  
Bond Orders ◽  
Higher Symmetry ◽  
Resonance Investigation ◽  
Cyclic Diene ◽  
Magnetic Resonance Investigation ◽  
Single Bonds

Proton magnetic resonance spectra including all observable 13C-H-couplings have been measured for chloro-cyclobutadiene-irontricarbonyl.bromo-cyclobutadiene-irontricarbonyl and methyl-cyclobutadiene-irontricarbonyl. The results are discussed with respect to structure and bonding. The structure of a cyclic diene with alternating double and single bonds can be excluded for the four-membered ring of all three compounds. Instead the complex bonded cyclobutadiene contains an electron distribution of higher symmetry with — despite the influence of the substituent — nearly uniform bond orders.

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