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Phthalocyanine is flat, for example in the crystal structure (linked on PubChem) or PQR or Wikipedia As noted in the comments, PubChem uses an efficient force field (MMFF94) which does not consider aromaticity. Since the record you linked is protonated (though strangely in a cis-oid configuration, not the typical trans-oid depiction) the steric ...


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The paramagnetic properties of atoms and molecules are mostly determined by the properties of the electron (in principle, a rotating molecule also is susceptible to a magnetic field, but the interaction associated with this effect is negligible in most cases). In addition to electron spin angular momentum, an electron can also have orbital angular momentum. ...


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