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porphyrin

I'm a semi-retired physical chemist.

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25 Understanding group theory easily and quickly Sep 7 '16
18 Is it possible for a substance to absorb a longer wavelength of EM wave and emit a shorter wavelength? Jul 7 '17
17 Why does bond angle decrease in the order H2O, H2S, H2Se? Aug 25 '16
14 What is resonance, and are resonance structures real? Jul 31 '16
13 Is there any empirical upper limit for order of reaction? Jul 19 '17
13 Can magnetic fields affect a chemical reaction? Jul 23 '16
12 Uv vis and fluorescence spectroscopy: sensitivity Nov 21 '17
12 Why is the magnesium(II) ion preferred over other ions in chlorophyll? Feb 3 '17
12 Why do spin isomers of hydrogen (ortho and para hydrogen) change their nuclear spin with temperature variance? Jan 29 '17
11 Will entropy increase in adiabatic expansion? Nov 16
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