Event: SPIE NanoScience + Engineering, 2011, San Diego, California, United States. In this work we study how plasmon modes of gold dimers are affected by a molecular bridge connecting both particles. Different models for the linker are considered to envisage the relation between the spectral changes observed in the extinction spectra and the electronic transport through the molecules. Depending on the size and nature of the molecular linker two different modes, known as BDP (Bonding Dimer Plasmon) and CTP (Charge Transfer Plasmon), are excited. Furthermore, when the molecular linker has an excitonic resonance, new spectral features emerge due to the plasmon-exciton coupling. This project was supported by the Etortek project inanoGUNE from the Basque Government (BG), project FIS2010-19609-C02-01 from the Spanish Ministry of Science and Innovation, grant IT-366-07 from BG-UPV/EHU and project CUBIHOLE EUI2008-03816 from European Union. Computational resources were provided by IZOSGIker (UPV/EHU, MICINN, BG, ESF). Peer reviewed