The nitrogen in an alkyl amine is sp3 hybridized and the N in pyridine is sp2 hybridized. The increased s character of the sp2 orbital means that the lone pair is pulled in closer to the nucleus,...
In the pyrimidine molecule, two CH groups "meta" to each other in the benzene ring are replaced by nitrogen atoms. Pyrimidine derivatives, such as cytosine, thymine, and uracil, are found in DNA and RNA. Purine: 3D: Download 3D: In the purine molecule, four nitrogen atoms are found in two fused rings. Purine derivatives, such as adenine and guanine, are found in DNA and RNA, as well as in many other important molecules, such as caffeine.
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Nov 16, 2011 · The answer is the same as it is for most structural problems in chemistry: the structure (in this case sp3 hybrdization) is the way it is to reduce repulsion. Water would be linear if the hydrogen shared an electron with the p orbitals and all of the electrons would be closer together.
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