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{{short description|Hydrocarbon compounds composed of rings fused such that the molecule is nonplanar}} ...molecular diagrams showing arching FIVE-13,16,17,82,88,89,90 and splitting SIX-7,16,36 interactions. <br> ...

...ref name=fang1938/> All nine atoms lie on a plane.<ref name=zach1937/> The six [[oxygen]] atoms are evenly divided into two distinct structural sites, wit ...

...formate]] oxygens close to the atom, and the other half are coordinated by six oxygens of formate groups.<ref name="Krogmann">{{cite journal|last1=Krogman ...pale green. It crystallises in a porous structure containing twenty member rings. The 40 water molecules "occluded" in the porous channels come out when it ...

...leaving carbon–carbon bonds by inserting tungsten into unstrained aromatic rings |url=https://www.nature.com/articles/nature08730 |journal=Nature |language= ...lphosphine)tungsten and W(PMe3)4(η2-CH2PMe2)H; formation of four- and five-membered oxametallacycles |journal=ChemTracts-Inorganic Chemistry |volume=3 |pages=2 ...

...rings so the concentration of the [[EDTA]] complex, which has six chelate rings, is much higher than a corresponding complex with two monodentate nitrogen ...d) has six donor atoms so it forms very strong complexes with five chelate rings. Ligands such as [[DTPA]], which have eight donor atoms are used to form co ...

...1,3-dioxepane which has considerably less ring strain. Rings that are six-membered and larger are less likely to polymerize due to lower ring strain.<ref name ...

...agonal rings, with an [[oxygen]] atom on each vertex, and the edges of the rings formed by [[hydrogen bond]]s. The planes alternate in an ABAB pattern, with ...nse than its liquid form. The tetrahedral-angled hydrogen-bonded hexagonal rings are also the mechanism that causes liquid water to be densest at 4&nbsp;°C. ...