Abstract
Homogeneous self-assembled monolayers (SAMs) of alkanethiols (HS(CH2)nX) on Au(111) were used as substrates for crystallization of ferriprotoporphyrin IX (heme) in acidic aqueous solution. Different terminal functional groups (X = OH, COOH, NH2, CH3) were used on the SAMs as models of sites where heme crystallization takes place in blood-feeding organisms. Atomic force microscopy, X-ray diffraction (XRD), and X-ray absorption near edge spectroscopy (XANES) were employed to characterize particle morphology, density, crystallographic orientation, and the coordination environment. It was found that the morphology and extent of growth of particulates were strongly affected by the environment in which they crystallize. As has been previously observed, acicular crystals form in DMSO−methanol solution, whereas irregular aggregates of crystals form in acidic aqueous solution. Here tabular crystals were found to form on -NH2 and -OH terminated SAMs, whereas inclined crystals formed on -COOH and -CH3 terminated sub...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
