Paddle wheel, configurational

An interesting novel approach for encoding stereochemical information in linear notation based on the configurational paddle wheel division of space around a chemical bond was published by Dietz. ... 

Several tri(cyclopentadienyl)tin(ll) and lead(ll) complexes have been prepared with alkali metal cations. The arrangement of Cp rings around the metal is in a paddle wheel configuration the alkali cation is bound to Cp and not Sn or Pb, further supporting the view of a weak alkali metal group 14 bond. Representative examples of these compounds include (77S-Cp)2E(/r-Cp)-Na(PMDTA) (E = Sn 230, Pb 231).239 240... 

The paddle configuration in each compartment is called a paddle wheel. A paddle wheel is composed of paddle arms, hi the figure, it is difficult to ascertain how many paddle arms there are in each paddle wheel, but what is obvious is that at least there are two arms per wheel. In each arm are then mounted the blades or slats. Assuming there are two paddle arms per paddle wheel, the total number of blades or slats per compartment is eight in the first compartment, six in the second compartment, and four in the third compartment. 

Paddle wheel—The paddle configuration in a flocculator compartment. 

They may or may not have flat, radial blades. The wheel configuration may be from simple paddle blades to the semi-open and enclosed types. They mav be belt or direct driven. 

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