Page 7 - Surface-Confined Assemblies and Polymers for Molecular Logic

Surface-Confined Assemblies and Polymers de Ruiter and van der Boom

FIGURE 10. Optical properties of the SPMA. (A) Absorbance at λ = 510 nm as a function of the applied potential. The dashed line denotes a sigmoidal
2
fit (R = 0.999), with an inflection point at (E 1/2 ) 0.91 V. (B) Derivative of the sigmoidal fit and the corresponding full-width at half-maximum (fwhm).
Adapted with permission from ref 40. Copyright 2010 American Chemical Society.

FIGURE 11. Multiple absorbance states at λ = 510 nm of the SPMA (A) when applying double-potential steps with 3 s intervals and (B) when applying
triple-potential steps with 3 s intervals. The dotted lines represent the attainable memory states and the applied potential values. Adapted with
permission from ref 38. Copyright 2010 Wiley-VCH Verlag GmbH & Co. KgaA.

FIGURE 12. Multiple absorbance states at λ = 630 nm of the PEDOT-coated ITO. (A) Quadruple potential steps with 3 s intervals. (B) Quintuple
potential steps with 3 s intervals. The dotted lines indicate the attainable memory states and the applied potential values. Adapted with permission
from ref 40. Copyright 2010 American Chemical Society.

theoretically construct a complete set of ternary logic gates in a solution of Pd(PhCN) 2 Cl 2 and the osmium component (B)
including the min and max operators, which are equivalent results in an exponential growing network. 37 The molecular
to the binary AND and OR gates. 36 We have focused on memory was constructed by using the optical absorbance of
multistate memory with electrochromic materials. Initial the SPMA at λ = 510 nm. When fully oxidized (Os 3þ ), the
steps toward achieving multistate memory were taken with MLCT band is bleached and the system is in state 0. When
a self-propagating molecular-based assembly (SPMA). The the assembly is fully reduced (Os 2þ ), the absorbance is
SPMA consists of an osmium polypyridyl complex restored and the system is in state 1. Modulation of the
(Scheme 1B) covalently grafted on ITO. Alternate immersion oxidation state can be achieved electrochemically by

Vol. 44, No. 8 ’ 2011 ’ 563–573 ’ ACCOUNTS OF CHEMICAL RESEARCH ’ 569