An investigation of ¹H and ¹³C longitudinal relaxation and relaxation in the rotating frame in solid poly(N‐vinylcarbazole)

Abstract

1 H and 13 C longitudinal relaxation times (T 1 ) and relaxation times in the rotating frame (T 1r ) have been measured for poly(N-vinylcarbazole) in the solid state in air and nitrogen atmospheres in an attempt to elucidate molecular motions. In air, the T 1 relaxation of both 1 H and 13 C was dominated by interaction with absorbed paramagnetic oxygen. In nitrogen, the 13 C T 1 relaxation times were long (>300 s) and were averaged by 13 C± 13 C spin diffusion. The 13 C T 1r relaxation times showed an exponential dependence on the strength of the rotating 13 C magnetic ®eld and were thus controlled by spin±spin processes rather than spin±lattice processes.

A Comparative Investigation Between Poly(N-vinylcarbazole) and Poly(3,6-N-vinylcarbazole): Spectroscopy, Conductivity, Thermal and Optical Properties

“…Electrolysis of N -vinylcarbazole (NVK) in acetonitrile, on a platinum electrode, generates a deposit of an electro-conducting polymer on the anode surface and the precipitation of a photo-conducting polymer in the solution. The former is a dark-green cross-linked polymer obtained mainly by polymerization through the carbazole units, whereas the latter is a white, comb-like polymer, in which the polymerization takes place exclusively through the vinyl group [19][20][21][22].…”