title: Unprecedented Charge-Transfer Complex of Fused Diporphyrin as Near-Infrared Absorption-Induced High-Aspect-Ratio Nanorods.
abstract: Charge-transfer (CT) complexes of near-infrared absorbing systems have been unknown until now. Consequently, structural similarities between donor and acceptor are rather important to achieve this phenomenon. Herein, we report electron donors such as non-fused diporphyrin-anthracene (DP), zinc diporphyrin-anthracene (ZnDP) and fused zinc diporphyrin-anthracene (FZnDP) in which FZnDP absorbs in NIR region and permits a CT complex with the electron acceptor, perylene diimide (PDI) in CHCl3exclusively. UV/Vis-NIR absorption,1H NMR, NOESY and powder X-ray diffraction analysis demonstrated that the CT complex formation occurs by π-π stacking between perylene units in FZnDP and PDI upon mixing together in a 1:1 molar concentration in CHCl3, unlike non-fused ZnDP and DP. TEM and AFM images revealed that the CT complex initially forms nanospheres leading to nanorods by diffusion of CH3OH vapors into the CHCl3solution of FZnDP/PDI (1:1 molar ratio). Therefore, these CT nanorods could lead to significant advances in optical, biological and ferroelectric applications.
authors: Inorganic & Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology (IICT), Tarnaka, Hyderabad-500007, Telangana, India.
authors: B Shivaprasad
authors: BS
authors: Achary
authors: School of Chemistry, Indian Institute of Scientific and Educational Research (IISER), Trivandrum-695016, Kerala, India.
authors: Sabapathi
authors: S
authors: Gokulnath
authors: Photoscience&Photonics Division, CSIR-National Institute of Interdisciplinary Science and Technology (NIIST), Trivandrum-695019, Kerala, India.
authors: Samrat
authors: S
authors: Ghosh
authors: Inorganic & Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology (IICT), Tarnaka, Hyderabad-500007, Telangana, India.
authors: Madoori
authors: M
authors: Mrinalini
authors: Inorganic & Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology (IICT), Tarnaka, Hyderabad-500007, Telangana, India.
authors: Seelam
authors: S
authors: Prasanthkumar
authors: Inorganic & Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology (IICT), Tarnaka, Hyderabad-500007, Telangana, India.|Academy of Scientific and Innovation Research (AcSIR), New Delhi, India.
authors: Lingamallu
authors: L
authors: Giribabu
keywords: NIR absorption; charge transfer; donor-acceptor systems; fused diporphyrin; nanorods