title: Assembly, growth and nonlinear thermo-optical properties of nitropeptides.
abstract: The molecular self-assembly, growth and nonlinear thermo-optical properties of three synthetic aromatic–aliphatic hybrid nitropeptides have been investigated. The X-ray crystallography of nitropeptide 2 containing a glutamic acid moiety shows that the peptide adopts a dimeric structure using intermolecular hydrogen bonding as well as face to face π–π stacking interactions. Moreover, nitropeptide 2 exhibits nonlocal nonlinear optical properties. When a Gaussian laser beam passes through nitropeptide 2, the peptide shows several concentric rings due to spatial self-phase modulation (SSPM). However, the homologous peptide 1 containing an aspartic acid moiety and peptide 3 containing an achiral α-aminoisobutyric acid (Aib) moiety adopt sheet-like structures and have no self-phase modulation effect. The report describes the thermo-optical properties consistent with assumption and calculation and is promising for their applications in nonlinear optical modulation devices.
authors.affiliation: Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, West Bengal 741246, India. deba_h76@yahoo.com deba_h76@iiserkol.ac.in.
authors.forename: Santu
authors.initials: S
authors.lastname: Bera
authors.forename: Deepak K S
authors.initials: DK
authors.lastname: Ambast
authors.forename: Bipul
authors.initials: B
authors.lastname: Pal
authors.forename: Debasish
authors.initials: D
authors.lastname: Haldar
mesh_terms: D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D008958:Models, Molecular; D008968:Molecular Conformation; D010316:Particle Size; D010455:Peptides / Q000138:chemical synthesis / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature
chemical_list: D010455:Peptides