TY - JOUR
T1 - Polyamine Linear Chains Bearing Two Identical Terminal Aromatic Units. Evidence for a Photo Induced Bending Movement
AU - Bernardo, M. Alexandra
AU - Alves, Sérgio
AU - Pina, Fernando
AU - De Melo, J. Seixas
AU - Albelda, M. Teresa
AU - Garcia-España, Enrique
AU - Llinares, José Miguel
AU - Soriano, Conxa
AU - Luis, Santiago V.
PY - 2001
Y1 - 2001
N2 - Several chemosensors bearing a fluorescent unit at both ends of a linear polyamine chain were synthesised. The protonation as well as the association constants with Cu2+ and Zn2+ were determined by potentiometry in 0.15 mol dm-3 NaCl at 298.1K. In the case of 1,16-bis(1-naphthylmethyl)-1,4,7,10, 13,16-hexaazadecane hexahydrochloride (L1), formation of an excimer emission in aqueous acidic solutions was observed. The system was characterized by steady state fluorescence emission and by time resolved fluorescence. In the ground state the molecule is expected to adopt a more or less linear conformation, while in the excited state a bending movement of the chain must occur in order to allow the excimer emission. The system can be viewed as an elementary machine driven by light.
AB - Several chemosensors bearing a fluorescent unit at both ends of a linear polyamine chain were synthesised. The protonation as well as the association constants with Cu2+ and Zn2+ were determined by potentiometry in 0.15 mol dm-3 NaCl at 298.1K. In the case of 1,16-bis(1-naphthylmethyl)-1,4,7,10, 13,16-hexaazadecane hexahydrochloride (L1), formation of an excimer emission in aqueous acidic solutions was observed. The system was characterized by steady state fluorescence emission and by time resolved fluorescence. In the ground state the molecule is expected to adopt a more or less linear conformation, while in the excited state a bending movement of the chain must occur in order to allow the excimer emission. The system can be viewed as an elementary machine driven by light.
KW - Chemosensors
KW - Excimer
KW - Molecular machines
KW - Polyamine
UR - http://www.scopus.com/inward/record.url?scp=0035564692&partnerID=8YFLogxK
U2 - 10.1080/10610270108029459
DO - 10.1080/10610270108029459
M3 - Article
AN - SCOPUS:0035564692
SN - 1061-0278
VL - 13
SP - 435
EP - 445
JO - Supramolecular Chemistry
JF - Supramolecular Chemistry
IS - 3
ER -