Pyrazine-bridged copper linear chains: Molecular-based one-dimensional quantum antiferromagnets

Low-dimensional quantum antiferromagnets are among the best systems for stu dying effects of quantum fluctuations within interacting systems. The best 1D S=1/2 Heisenberg antiferromagnetic system is Cu(pyrazine)(NO3)(2), or Cu PzN, since it has excellent 1D isolation and an exchange constant (2J/k(B) = -10.5 K) which permits available fields to saturate the magnetization. Re placing the pyrazine ligands with substituted pyrazines, such as methylpyra zine (mepz), 2,3-dimepz, and 2,5-dimepz, lowers the exchange strengths sign ificantly. We are conducting an in-depth study of the static and dynamic pr operties of the CuPzN family, including high field magnetization studies an d neutron scattering.