Cyanocarbon Chemistry. XVII. Tricyanoethylene and Tricyanovinyl Chloride¹

Effect of the Addition of Electrolytes on the Partition Coefficients, Activity Coefficients, and Acid Dissociation Constants of Carnitine and its Acetyl and Propionyl Derivatives

“…The obtained free acid is a somewhat unstable yellow-brown crystalline material with mp 68-70 "C (lit.6 65-70 "C) and pK, of 1.90. 6 Preparation of (CH+PCP-), (AcCH+PCP-), and (PrCH+-PCP-)-The molarity of the PCPH solution that result8 from the above elution process was determined by potentiometric titration with standard 1 M NaOH. A slight excess (-1 % ) of PCPH was then converted to the required salts by neutralization with C*, AcC', and P S I , respectively.…”

Photoinduced Charge-Transfer Reactions of Tricyanoethylene with Aromatic Hydrocarbon Electron Donors. II. Semiempirical Studies of Naphthalene-Tricyanoethylene Exciplex

“…of the verti cal tra nsiti on energi es (f ro m gro und-to -exci ted sta te and vi ce versa), the oscil l ato r streng ths, and the di po le m oments, for AM1 opti m i zed structures of NP{ TR CNE system were p er- T ri cyano ethylene is chem i call y sim i lar to tetra cya no ethyl ene (TCNE), and l i ke TCNE i t i s ¤ -acid, who se acid streng th as compa red to TCNE i s decreased i n correspondenc e to the change of rel ati ve electro n-wi thdra wi ng character of cyano and hydro gen [2], as reÛected by electro n a£ ni ti es of b oth mol ecules [22,23] Ho…”

“…Deper asi ¥ska, J. Pr ochor ow we ha ve found tha t an electro n-do no r-acceptor (E D A) system of na phtha l ene (NP) and TR CNE seems to b e som ewhat p eculi ar am ong the other system s under study . Si mi l arl y to other el ectro n do nors of m ethyla ted b enzenes fa mi ly, NP form s rel ati vel y weak gro und-sta te-stabl e charg e-tra nsf er or ED A com pl exes wi th TR CNE [2,3], f or whi ch a chara cteri sti c CT absorpti on band can b e observed ; i n no np ol ar sol vent di rect exci ta ti on wi thi n thi s ba nd leads to a very weak CT Ûuorescence [1]. Furtherm ore, we ha ve found tha t TR CNE acts as a stro ng quencher of mol ecular Ûuorescence of NP , and tha t the m echani sm of thi s bi molecul ar quenchi ng reacti on i nv ol ves (o r pro ceeds vi a) the fo rm atio n of exci ted CT sta te, o r exci pl ex.…”

“…Gb 1. I n t r o d u ct io n R ecentl y, i n the course of emi ssion studi es of pho to i nduced char ge-tra nsfer reacti ons [1] for a series of aro mati c hydro car bon electro n do nors wi th tri cyano ethyl ene ( TR CN E), a stro ng el ectro n acceptor fro m the fam il y of cyano ethyl enes [2], (8 11) I . Deper asi ¥ska, J. Pr ochor ow we ha ve found tha t an electro n-do no r-acceptor (E D A) system of na phtha l ene (NP) and TR CNE seems to b e som ewhat p eculi ar am ong the other system s under study .…”

Photoinduced Charge-Transfer Reactions of Tricyanoethlene with Aromatic Hydrocarbon Electron Donors. I. Emission Studies of Naphthalene-Tricyanoethylene Exciplex

“…The form ati on of exci pl exes, as veri Ùed by the app eara nce of exci pl ex Ûuorescence i n va ri ous sol vents, ha s been rep orted onl y for fum aro nitri l e ( t r a n s-1,2-di cyano ethylene) and a series of pol yco ndensed aro m ati c hydrocarb ons [25]. In the case o f tri cyano ethyl ene (T R CNE) the form atio n of i ts weak CT com pl exes wi th to l uene and durene i n CH 2 Cl 2 sol uti on ha s b een mentio ned on the o ccasion of i ts Ùrst synthesi s [26].…”