Chiral morphologies and interfacial electronic structure of naphtho[2,3-a]pyrene on Au(111).
The adsorption of the two-dimensionally chiral naphtho[2,3-a]pyrene molecule has been studied on Au(111). Both structural and electronic properties of the naphtho[2,3-a]pyrene (NP)/Au(111) interface have been measured. Ultraviolet and X-ray photoelectron spectroscopy have been employed to measure the energies of the molecular orbitals of the NP film with respect to the gold Fermi level. A Schottky junction with a large interface dipole (0.99 eV) is formed between Au(111) and NP. Temperature-programmed desorption was used to determine that adsorbed NP has a binding energy of 102.2 kJ/mol. Chiral domains have been observed with scanning tunneling microscopy due to the spontaneous phase separation of the 2-D enantiomers. Two distinct structural polymorphs have been observed, one of which has homochiral paired molecular rows. Models of the 2D structure are proposed that are in excellent agreement with experimental measurements.
France
C B
CB
Colorado State University, Department of Chemistry, Fort Collins, Colorado 80523, USA.
Parkinson
B A
BA
D004583:Electrons; D006046:Gold / Q000737:chemistry*; D008956:Models, Chemical; D008958:Models, Molecular; D009281:Naphthalenes / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D011721:Pyrenes / Q000737:chemistry*; D013237:Stereoisomerism; D013499:Surface Properties; D013696:Temperature
D009281:Naphthalenes; D009942:Organometallic Compounds; D011721:Pyrenes; C501268:naphtho(2,3-a)pyrene; D006046:Gold