Difference between Protoporphyrin and Porphyrin? [closed]
2022年5月13日 · I understand that Porphyrin is defined as 4 pyrole rings linked by methenyl bridges. When this porphyrin ring is associated with a Ferrous ion (Fe 2+) we get the Heme molecule. However my book mentions that Heme is a complex of Protoporhyrin IX and Ferrous ion. So what is the difference between a Porphyrin ring and a Protoporphyrin ring?
Why is porphyrin aromatic? - Chemistry Stack Exchange
2019年5月19日 · The aromatic properties are evident from the heats of combustion, the fact that all bonds have the same length, the ability of porphyrins and metalloporphyrins to undergo electrophilic substitution reactions, the stability of the porphyrin nucleus in electron impact mass spectrometry and the characteristic chemical shifts observed in proton NMR spectra1.
How does ferrous iron coordinate nitrogen in a porphyrin ring?
In first semester biochemistry, my professor said that iron forms a coordination complex with nitrogens in the heme group. I'm failing to understand what this even means since the charge on nitro...
biochemistry - Why does the structure of haemoglobin change …
2018年5月15日 · The other 4 bonds are to the porphyrin N atoms making the geometry square pyramidal. In this state the Fe is just a little too big to fit into the porphyrin ring which becomes a distorted, bending towards the histidine. The Fe is 0.07 - 0.08 nm out of the plane and the Fe-N distance 0.22 nm (to the imidazole N on histidine F8).
Uncertainity principle of a particle on a ring in $m=0$ state
2020年6月16日 · When the particle has zero energy its orientation is unknowable meaning that it can be anywhere on the ring which is accord with the uncertainty principle. $\endgroup$ – porphyrin Commented Jun 16, 2020 at 10:52
What would happen if we had a different kind of metal in our ...
Heme is a complex molecule with a porphyrin ring attached to a iron center. Several other such molecules with similar structures are also there, Chlorophyll a has a similar structure with Magnesium at the centre of the Porphyrin ring. Researching on chlorophyll a …
HOMO and LUMO Conjugated System - Chemistry Stack Exchange
2021年4月19日 · The particle on a ring is a useful model for the motion of electrons around the porphine ring, the conjugated macrocycle that forms the structural basis of the heme group and the chlorophylls. We may treat the group as a circular ring of radius $\pu{440 pm}$ , with 20 electrons in the conjugated system moving along the perimeter of the ring.
Why does blood get further oxidized than Iron oxide?
2014年8月13日 · The porphyrin ring is oxidized and cut open by an oxygen on the the iron. Several colorful compounds are produced, including the iron complexes themselves and biliverdin (green), bilirubin (yellow). These are the same colors you see under your skin, of you hit yourself hard and have some bleeding in your tissues.
Is Porphyrin Planar? - Chemistry Stack Exchange
2020年12月7日 · $\begingroup$ Porhyrins readily undergo distortions, and speaking of porphyrin metal complexes, they are as planar as metal centers allow them to be. $\endgroup$ – andselisk ♦ Commented Dec 7, 2020 at 8:49
Why is the magnesium(II) ion preferred over other ions in …
2016年4月11日 · Magnesium ions tune the electronic properties of the tetrapyrole ring of chlorophyll. Why would the delicate photosythetic machinery fail if magnesium was substituted with calcium or zinc ions? My bet is that magnesium has been selected over millions of years of evolution because of its availability and solubility: it is five times more ...