Ab initio calculations of 29Si NMR chemical shifts for some gas phase and solid state silicon fluorides and oxides

1986 ◽  
Vol 84 (1) ◽  
pp. 369-374 ◽  
Author(s):  
John A. Tossell ◽  
Paolo Lazzeretti
Keyword(s):  
Solid State ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Gas Phase ◽  
Chemical Shifts ◽  
29Si Nmr ◽  
Nmr Chemical Shifts

Ab initio predictions of zeolite structures and 29Si NMR chemical shifts

1997 ◽  
Vol 9 (2-4) ◽  
pp. 155-164 ◽  
Author(s):  
Beate Bussemer ◽  
Klaus-Peter Schröder ◽  
Joachim Sauer
Keyword(s):  
Ab Initio ◽  
Chemical Shifts ◽  
29Si Nmr ◽  
Nmr Chemical Shifts

Ab initio calculations on zinc porphyrins complexed to amines: geometrical details and NMR chemical shifts

2000 ◽  
Vol 531 (1-3) ◽  
pp. 381-386 ◽  
Author(s):  
R.M Gomila ◽  
D Quiñonero ◽  
A Frontera ◽  
P Ballester ◽  
P.M Deyà
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Chemical Shifts ◽  
Nmr Chemical Shifts ◽  
Zinc Porphyrins

Ab initio prediction of 29Si-NMR chemical shifts

2002 ◽  
Vol 1 (1) ◽  
pp. 63-65
Author(s):  
Chu Shidong ◽  
Li Yingxia ◽  
Song Ni ◽  
Guan Huashi
Keyword(s):  
Ab Initio ◽  
Chemical Shifts ◽  
29Si Nmr ◽  
Nmr Chemical Shifts ◽  
Ab Initio Prediction

The Molecular Structures of the Three Disilylbenzenes Determined in the Gas Phase, the Solid State and by ab initio Calculations

2002 ◽  
Vol 57 (2) ◽  
pp. 202-214 ◽  
Author(s):  
Norbert W. Mitzel ◽  
Paul T. Brain ◽  
Michael A. Hofmann ◽  
David W. H. Rankin ◽  
Robert Schröck ◽  
...  
Keyword(s):  
Solid State ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Gas Phase ◽  
Benzene Ring ◽  
Structural Parameters ◽  
Detailed Comparison ◽  
Molecular Structures ◽  
X Ray Diffraction ◽  
Structural Distortions

The molecular structures of four silylbenzenes (benzenes with H3Si-substituents), viz. silylbenzene, 1,2-, 1,3- and 1,4-disilylbenzene, were studied by electron diffraction in the gas phase and by ab initio calculations. The structures of 1,2- and 1,4-disilylbenzene were also determined by X-ray diffraction experiments on single crystals grown in situ. The results are compared and discussed with the focus on the evaluation of the SARACEN method for the analysis of gas-phase data, and particularly on its ability to deal with small structural distortions. Important experimental structural parameters are the Si-C bond lengths [Å] and the ipso C-C-C angles [deg], which are 1.863(3) / 118.2(2) for gaseous silylbenzene (rα), 1.875(2) / 119.9(2) for gaseous and 1.870(2) / 118.7(av) for solid 1,2-disilylbenzene, 1.871(1) / 119.4(3) for gaseous 1,3-disilylbenzene, 1.870(2) / 119.0(2) for gaseous and 1.866(3) / 117.4(2) for solid 1,4-disilylbenzene. The angle distortions in the benzene ring geometries are analysed and interpreted in terms of an additivity rule of the distortion caused by each of the silyl substituents. This additivity scheme predicts excellently the observed structures of the silylbenzenes and is in best agreement with the structures calculated ab initio. The slight distortion of molecular symmetry in the crystal structures makes a detailed comparison of the solid-state values impossible, but on average they are in good agreement with theory and predictions of the additivity model. The gas-phase values obtained by the SARACEN method show less pronounced distortions of the benzene ring geometries than observed or predicted by the other methods, but the trends of distortion are fully consistent.

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