Thermal effects on the optical spectra of a polydiacetylene: Poly{1,2-bis [4- (isopropylcarbamoyloxy) -n-butyl]-1-buten-3-ynylene}

Abstract

Eckhardt, H.; Eckhardt, Craig J.; and Yee, K.C., "Thermal effects on the optical spectra of a polydiacetylene: Poly{1,2-bis [4-(isopropylcarbamoyloxy) -n-butyl]-1-buten-3-ynylene}" (1979). Craig J. Eckhardt Publications. 36.

Mannose–Escherichia coli interaction in the presence of metal cations studied in vitro by colorimetric polydiacetylene/glycolipid liposomes

“…An example can be observed in the UV-visible spectrum of the PCDA/MC 16 -E. coli-Ca 2þ system in Fig. 1, curve c. On the contrary, other transition metal cations such as Cu 2þ , Fe 3þ , Ni 2þ and Zn 2þ inhibited biochromism in PCDA/MC 16 regularity. Briefly, the addition of Ca 2þ , Mg 2þ , Ba 2þ , Cd 2þ and Ag þ to liposomes obviously increased CR values, whereas Fe 3þ and Cu 2þ decreased the biochromatic degree almost to the system background (CR ¼ 7%), and Zn 2þ and Ni 2þ slightly weakened biochromism.…”

“…Liposomes of a mixture of polymerizable matrix lipid (PCDA) and receptor-containing lipid (MC 16 obtained by bath sonication. Both lipids (1 mM, in chloroform) were mixed in 0.05 molar ratio of MC 16 to PCDA.…”

“…Both lipids (1 mM, in chloroform) were mixed in 0.05 molar ratio of MC 16 to PCDA. The solvent was removed completely by nitrogen stream, and an equivalent amount of ultrapure water was added to the dried lipids.…”

“…10,12-Pentacosadiynoic acid (PCDA), purchased from Farchan Laboratories (USA), was recrystallized from petroleum ether (30-60°C) twice before use. MC 16 and PCDA were both dissolved in chloroform (1 mM). All other reagents were of analytical grade without further purification.…”

Two colorful applications of the PPP method

“…Chance et al [25] as well as Eckhardt et al [26] have found a thermochromic phase transition from I to I1 which is accompanied by a blue shift. Similarly a dramatic color change occurs upon addition of non solvents like hexane to urethane-substituted PDAs.…”