BHTCNQ

We present in Table 2 a "zoo" of molecules (13-22) prepared by the ORP, which we have shown to form PL monolayers at the air-water interface, and which transfer well onto A1 or glass or other slides as LB monolayers. TTF-C-BHTCNQ, 13, was difficult to purify the "neutral" form seemed to deposit "pancake-style" onto the water, and synthetic difficulties forced its abandonment. The strongest films (highest collapse pressure, most vertical pressure-area isotherm) were obtained with BDDAP-C-BHTCNQ, 15 (Fig. 1). The acceptor HMTCAQ used in 17 and 18 was easy to prepare [9], but is well known to be a weak two-electron acceptor, with a highly non-planar geometry [22]. 

A certain number of crystal structures have been solved of the donor DMAP-C-Me, 23 [11] (Fig.4) the acceptor BHTCNQ, 11 [13] (Fig.5), and of the methyl ester (AETCNQ, 27) of the acceptor HETCNQ, 12 [14] (Fig.6). TTie difference in conformation between AETCNQ... 

Fig. 9. Structure (top), MNDO conformation (middle), and MNDO van der Waals shape, viewed from the acceptor end (bottom) for TTF-C-FHTCNQ, a variant of TTF-C-BHTCNQ, 13 lD=8.197eV, Aa = 2.975 eV,... 

Grazing-angle Fourier transform infrared (FTIR) spectra of monolayers of BDDAP-C-HMTCAQ, BDDAP-C-BHTCNQ, and TDDOP-C-HETCNQ, have been measured, and reported previously [19-21, 23]. The C-H stretch bands are well resolved, even for a single monolayer, and a broad structure at about 3500 cm- is seen for "fresh" samples, but disappears for samples older than about 60 days this may be water trapped between the LB film layer and the aluminum layer, but the identification is not certain. Further studies are planned. 

In the third experiment, the same effect was obtained by Dr. Pomerantz, when an LB monolayer of BDDAP-C-BHTCNQ, 15, was deposited on the Au I Ag I mica substrate... 

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