  Temperature and magnetic field dependent magnetization and extraction of
entanglement from the experimental data is reported for
dichloro(thiazole)copper(II), a Heisenberg spin chain system. The magnetic
susceptibility vs. temperature plot exhibits signature of infinite spin chain.
Isothermal magnetization measurements (as a function of magnetic field) were
performed at various temperatures below the antiferromagnetic (AFM) ordering,
where the AFM correlations persist significantly. These magnetization curves
are fitted to the theoretically generated Bonner-Fisher model. Magnetic
susceptibility can be used as a macroscopic witness of entanglement; using
which entanglement is extracted from the experimentally measured magnetic data.
