We studied the electrical conductance of single-molecule junctions formed from molecular wires with 4 anchor groups. Three tetraphenyl-aza-BODIPYs with 4 or 2 thiomethyl anchor groups were synthesized and their single-molecule conductance measured using breakjunction-STM. Using DFT based calculations these compounds were shown to contain a combination of constructive and destructive quantum interference, depending on the molecule's connectivity in the junction. A scissor correction is employed to obtain the corrected HOMO-LUMO gaps and a tight binding model (TBM) is used to highlight the role of quantum interference in the tetraphenyl-aza-BODIPY central unit.

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