Molecular orbitals and maps of electron density differences between the states involved in the electronic transition of absorption located at 387–401 nm for R5 to R10 (yellow: density reduction; and green: density increment due to the transition).
| Complex | HOMO | LUMO+3 | LUMO+2 | Density diff. |
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| R5 |
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| R6 | HOMO | LUMO+1 | LUMO+2 | Density diff. |
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| R7 |
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| R8 | HOMO | LUMO+2 | Density diff. | |
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| R9 | HOMO | LUMO+1 | LUMO+2 | Density diff. |
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| R10 | HOMO | LUMO+2 | Density diff. | |
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