Mössbauer spectroscopic study on spin crossover coordination polymer Fe(3-Clpy)2[Pd(CN)4]

57Fe Mossbauer spectroscopic results on the alternatively prepared spin crossover coordination polymer Fe(3-Clpy)2Pd(CN)4 sample I agree with those of SQUID data. Mossbauer specrum at RT shows two diffrent doublets which correspond to the HS1(inner doublet) and HS2(outer doublet). The intensity of the HS1 doublet decreases on cooling to 78 K at the expense of a new one featuring the LS singlet. Almost 100 % of HS1 change to LS singlet due to iron(II) ions coordinated by four N atoms of cyano groups and two N atoms of 3-Clpy ligand in the sample I. The SQUID data of the sample I prepared by a new direct contact method are different from those of the already reported Fe(3-Clpy)2Pd(CN)4 sample. The differences of the SQUID data are associated with particle size effects in molecule spin crossover samples.