No abstract

No abstract

p-Oxo-bis [protoporphyrin IX dimethyl ester iron(111)3 gave magnetic susceptibility data from 1-5 to 293 K which fit a model dimer with strong anti-ferromagnetic exchange coupling (2J 380 K) between highspin iron(II1) atoms.

A simple magnetometer for use with weakly paramagnetic frozen solutions is described. It uses the same superconducting coil for generating the field and detecting the vibrating magnetization. A nearly translationally invariant sample holder and low frequency vibration of large amplitude are advantageous. In a sample volume of 0.7 ml, 2×10−7 moles of a species having a single g=2, s=½ spin produces a signal reproducibly different from that of pure water, when the temperature is varied from 77 to 2 K.