K W Hipps - Physical Properties and Metal Ion Specific Scanning Tunneling Microscopy Images of Metal(II) Tetraphenylporphyrins Deposited from Vapor onto Gold (111)

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      Publication Details (including relevant citation   information):

      Scudiero, L., Barlow, Dan E., Hipps, K. W. The Journal of   Physical Chemistry B 2000 104 (50)   11899-11905

      Abstract: Thin films of vapor deposited Cu(II),   Ni(II), and Co(II) complexes of tetraphenylporphyrin (CuTPP,   NiTPP, and CoTPP) supported on gold are studied by Reflectance   Absorption Infrared Spectroscopy (RAIR) and X-ray photoelectron   spectroscopy (XPS). In addition, scanning tunneling microscopy   (STM) images of ultrathin (submonolayer) thermally deposited   films of CoTPP and NiTPP on Au(111) are reported. The constant   current STM images show a remarkable bias dependence that allows   for the selective identification of different   metallotetraphenylporphyrins (MTPPs). High resolution STM data   are presented that clearly show the individual MTPP molecules and   allow easy differentiation between NiTPP and CoTPP, even when   mixed monolayer structures are studied. The strong tunneling   enhancement through the Co(II) dz2 orbital at intermediate bias   values parallels what is observed in Co(II) phthalocyanines and   is especially interesting since the cobalt ion in CoTPP is   presumed to be located several Angstroms above the Au(111) plane   relative to the cobalt ion in CoPc.

      Address (URL): http://dx.doi.org/10.1021/jp002292w