title: Electrostatic interactions in phospholipid membranes revealed by coherent 2D IR spectroscopy.
abstract: The inter- and intramolecular interactions of the carbonyl moieties at the polar interface of a phospholipid membrane are probed by using nonlinear femtosecond infrared spectroscopy. Two-dimensional IR correlation spectra separate homogeneous and inhomogeneous broadenings and show a distinct cross-peak pattern controlled by electrostatic interactions. The inter- and intramolecular electrostatic interactions determine the inhomogeneous character of the optical response. Using molecular dynamics simulation and the nonlinear exciton equations approach, we extract from the spectra short-range structural correlations between carbonyls at the interface.
authors: European Laboratory for Nonlinear Spectroscopy, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy. vvolkov@lens.unifi.it
authors: V V
authors: VV
authors: Volkov
authors: R
authors: R
authors: Chelli
authors: W
authors: W
authors: Zhuang
authors: F
authors: F
authors: Nuti
authors: Y
authors: Y
authors: Takaoka
authors: A M
authors: AM
authors: Papini
authors: S
authors: S
authors: Mukamel
authors: R
authors: R
authors: Righini
mesh_terms: D016880:Anisotropy; D002244:Carbon / Q000737:chemistry; D003198:Computer Simulation; D007700:Kinetics; D008051:Lipid Bilayers / Q000737:chemistry; D015233:Models, Statistical; D008968:Molecular Conformation; D010743:Phospholipids / Q000737:chemistry*; D013053:Spectrophotometry / Q000379:methods; D013055:Spectrophotometry, Infrared / Q000379:methods*; D017550:Spectroscopy, Fourier Transform Infrared; D055672:Static Electricity
chemical_list: D008051:Lipid Bilayers; D010743:Phospholipids; D002244:Carbon