PMID- 17022096
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20070712
LR  - 20061113
IS  - 1439-4235 (Print)
IS  - 1439-4235 (Linking)
VI  - 7
IP  - 11
DP  - 2006 Nov 13
TI  - Chirality amplification of porphyrin assemblies exclusively constructed from 
      achiral porphyrin derivatives.
PG  - 2419-23
AB  - Two achiral porphyrin derivatives, 
      5,10,15,20-tetrakis(4-methoxyphenyl)-21H,23H-porphine (TPPOMe) and 
      5,10,15,20-tetrakis(4-hydroxyphenyl)-21H,23H-porphine (TPPOH), were spread onto 
      an air/water interface. The spreading films were transferred onto solid 
      substrates by the Langmuir-Schaefer (LS) method. Although both of the porphyrin 
      derivatives are achiral species, the transferred LS multilayer films shows 
      macroscopic supramolecular chirality, which is suggested to be due to the 
      spontaneous symmetry breaking that occurs at the air/water interface. A strong CD 
      signal is observed from the as-deposited TPPOH LS film, while a relatively weak 
      CD signal is detected from that of TPPOMe. Interestingly, when the TPPOMe LS film 
      was annealed in high vacuum, a significant amplification of the supramolecular 
      chirality is observed. Atomic force microscopy observations confirm that TPPOMe 
      form more ordered aggregates upon annealing. It is suggested that the small 
      amount of chiral assemblies formed in the as-deposited LS film grow into larger 
      ones following the "sergeants and soldiers" principle during the annealing 
      process.
FAU - Chen, Penglei
AU  - Chen P
AD  - Beijing National Laboratory for Molecular Science, CAS Key Laboratory of Colloid, 
      Interface, and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy 
      of Sciences, Beijing, 100080, PR China.
FAU - Ma, Xiaoguang
AU  - Ma X
FAU - Duan, Pengfei
AU  - Duan P
FAU - Liu, Minghua
AU  - Liu M
LA  - eng
PT  - Journal Article
PL  - Germany
TA  - Chemphyschem
JT  - Chemphyschem : a European journal of chemical physics and physical chemistry
JID - 100954211
EDAT- 2006/10/06 09:00
MHDA- 2006/10/06 09:01
CRDT- 2006/10/06 09:00
PHST- 2006/10/06 09:00 [pubmed]
PHST- 2006/10/06 09:01 [medline]
PHST- 2006/10/06 09:00 [entrez]
AID - 10.1002/cphc.200600402 [doi]
PST - ppublish
SO  - Chemphyschem. 2006 Nov 13;7(11):2419-23. doi: 10.1002/cphc.200600402.