In contrast to ferrocene, wherein the cyclopentadienyl rings are in a staggered conformation, those of ruthenocene crystallise with an eclipsed conformation.
12.
Phosphoryl groups are transferred during PEPCK action, which is likely facilitated by the eclipsed conformation of the phosphoryl groups when ATP is bound to PEPCK.
13.
The crystal structure of octaphenylrhodocene shows a staggered conformation ( similar to that of ferrocene, and in contrast to the eclipsed conformation of ruthenocene ).
14.
This locks the carbonyl and the Lewis base substituent in an eclipsed conformation, and the nucleophile will then attack from the side with the smallest free ?-carbon substituent.
15.
This difference is due to the larger ionic radius of ruthenium, which increases the distance between the cyclopentadienyl rings, decreasing steric interactions and allowing an eclipsed conformation to prevail.
16.
Thus, the substituents of ring atoms exist in an eclipsed conformation in cyclopropanes and between gauche and eclipsed in cyclobutanes, contributing to higher ring strain energy in the form of Van der Waals repulsion.
17.
The two conformations, also known as rotamers, differ in energy : The staggered conformation is 12.6 kJ / mol lower in energy ( more stable ) than the eclipsed conformation ( the least stable ).
18.
In chemistry an "'eclipsed conformation "'is a conformation in which two substituents X and Y on adjacent atoms A, B are in closest proximity, implying that the hybridised atoms, and it is normally a conformational energy maximum.
19.
The textbook explanation for the existence of the energy maximum for an eclipsed conformation in ethane is steric hindrance, but, with a C-C bond length of 154 pm and a Van der Waals radius for hydrogen of 120 pm, the hydrogen atoms in ethane are never in each other's way.
