A 2D Interactive Spin Ladder System, delta '-(BEDT-TTF)(2)ClC2H4SO3 center dot H2O

A Curie-Weiss-type paramagnetic delta-(BEDT-TTF)(2)ClC2H4SO3 center dot H2O with theta/2 = j = -45.4 K has a phase transition at 160 K, below which the salt has a delta'-type 2D donor arrangement with 1D Heisenberg antiferromagnetic behavior with j = -121.6 K. Further cooling below 140 K induces a weak dimerization in the donor layers leading to a spin ladder system.