Li Xue-Mei, Auletta Tommaso, van Veggel Frank C J M, Huskens Jurriaan, Reinhoudt David N
Laboratory of Supramolecular Chemistry and Technology, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
Org Biomol Chem. 2004 Feb 7;2(3):296-300. doi: 10.1039/b312422c. Epub 2003 Dec 15.
Pd(ii) pincer adsorbate molecules (1) were inserted into self-assembled monolayers (SAMs) of alkanethiols with different chain lengths (C(8) to C(18)) on annealed gold substrates. Their presence was brought to expression by reaction of with Au nanoclusters bearing phosphine moieties (2). The surface-confined Au nanoclusters were observed only on the shorter chain SAMs (C(8)SH to C(16)SH) and not on C(18)SH SAMs. This is attributed to the longer chain length of C(18)SH preventing the insertion of pincer molecules. Microcontact printing (microCP) with C(18)SH on unannealed gold substrates and the subsequent immersion of the substrates into C(8)SH, C(10)SH, C(12)SH, or C(16)SH solutions, yielded a series of patterned SAMs that have areas of thiols of different chain lengths. Insertion of 1 followed by expression using 2, or insertion of 3 showed inserted molecules only in the shorter chain SAM areas. The absolute particle densities in the former case were higher than on the corresponding homogeneous SAMs on annealed substrates, probably due to larger numbers of defects in the SAMs on unannealed substrates.
将钯（II）钳形吸附分子（1）插入到在退火金基底上具有不同链长（C（8）至C（18））的链烷硫醇自组装单分子层（SAMs）中。通过与带有膦部分的金纳米团簇（2）反应来体现它们的存在。仅在较短链的SAMs（C（8）SH至C（16）SH）上观察到表面受限的金纳米团簇，而在C（18）SH SAMs上未观察到。这归因于C（18）SH的较长链长阻止了钳形分子的插入。在未退火的金基底上用C（18）SH进行微接触印刷（microCP），随后将基底浸入C（8）SH、C（10）SH、C（12）SH或C（16）SH溶液中，得到了一系列具有不同链长硫醇区域的图案化SAMs。插入1后用2进行体现，或者插入3，结果显示插入的分子仅在较短链SAM区域中。在前一种情况下的绝对粒子密度高于退火基底上相应的均匀SAMs，这可能是由于未退火基底上的SAMs中存在大量缺陷。
