Do there exist metals that are composed of molecules?
According to A Conducting Crystal Based on A Single-Component Paramagnetic Molecule,
[Cu(dmdt)2] (dmdt ) Dimethyltetrathiafulvalenedithiolate) J. Am. Chem. Soc., 2002, 124 (34), pp 10002–10003 :


  Single-component molecular metals should greatly extend the
  development of new types of molecular conductors. For example,
  while the first metallic molecule-based magnet has been reported
  recently, [reference 8] it may be possible to create such metallic molecular
  magnets from single-component molecules containing paramagnetic
  ions such as Cu2+ and Co2+.


Reference 8 is Coexistence of ferromagnetism and metallic conductivity in a molecule-based layered compound Nature 408, 447-449 


  The temperature dependence of the resistance exhibits a metallic behaviour over the entire temperature range that we investigated (down to 2 K).