Some thoughts on the existence of ion and water channels in highly dense and well-ordered CH3-terminated alkanethiol self-assembled monolayers on gold.
Through extensive and systematic reviewing of literatures, this paper presents some thoughts on the existence of ion and water channels in highly dense and well-ordered CH(3)-terminated alkanethiol self-assembled monolayers (C(n)SH-SAMs) on gold: (1) based on the combinational effect of "the van der Waals interaction between the neighbor hydrocarbon chains", "the framework size of C(n)SH molecule" and "the surface lattice structure of C(n)SH-SAMs on gold", a simple ideal model of the close-packed C(n)SH-SAMs is proposed for the first time. The channel with an appropriate diameter of about 3A ( approximately 3A) existing in SAMs on Au is deduced, which is found large enough for ions and water molecules to permeate; (2) through summarizing the literature reports for various experiments (e.g. scan microscopy techniques and electrochemical methods, etc.), the existence of the ion and water channels ( approximately 3A) in close-packed C(n)SH-SAMs is verified; (3) furthermore, the effect of the ions and water molecules permeation on the studies of the SAMs' electron tunneling process is discussed. This simple ideal model of the close-packed C(n)SH-SAMs established by us may clarify the controversies about the permeation mechanism of ions and water molecules in C(n)SH-SAMs.
School of Chemistry and Chemical Engineering, State Key Laboratory of Coordination Chemistry of China & Key Laboratory of MOE for Life Science, Nanjing University, Nanjing 210093, China.
Jianyuan
J
Dai
Zhiguo
Z
Li
Jing
J
Jin
Yanqing
Y
Shi
Jiongjia
J
Cheng
Jing
J
Kong
Shuping
S
Bi
D000327:Adsorption; D000473:Alkanes / Q000737:chemistry*; D020346:Aquaporins / Q000737:chemistry*; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D007473:Ion Channels / Q000737:chemistry*; D008567:Membranes, Artificial; D008745:Methylation; D013438:Sulfhydryl Compounds / Q000737:chemistry*
D000473:Alkanes; D020346:Aquaporins; D020099:Coated Materials, Biocompatible; D007473:Ion Channels; D008567:Membranes, Artificial; D013438:Sulfhydryl Compounds; D006046:Gold