Abstract
The integrity, chemical identity, packing density, and molecular orientation in SAMs formed by anthracene-substituted alkanethiols (Ant-n) with a variable number of methylene groups (n) in the aliphatic linker on Au(111) and Ag(111) substrates were studied by a combination of several complementary experimental techniques. The Ant-n molecules were found to form well-defined and highly ordered SAMs on these substrates, with very small inclination of the anthracene backbone. In addition, the Ant-n SAMs exhibited odd−even effects, that is, dependence of the molecular orientation and packing density on the length of the aliphatic linker, with the parity of n being the decisive parameter. While the direction (sign) of this odd−even behavior on gold and silver is the same as for SAMs of biphenyl- and terphenyl-substituted alkanethiolates and -alkaneselenolates, suggesting a common reason behind this phenomenon, the presence of a strong substrate−headgroup−C bending potential, the extent of the odd−even effects i...
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