Spectrochemical Study of Microscopic Crystals. XI. The Structure and Polarized Absorption Spectra of Some Metallic Compounds with Remarkable Interaction between Metal Atoms through Anions

Polarized absorption spectra of [Pd(NH3)2Cl2] [Pd(NH3)2Cl4], Pt(en)Cl3 and (NH4)3AgAuCl7in the crystalline state have been determined by Tsuchida-Kobayashi’s microscopic method in the regions betwen 2400 and 8000 Å. The crystals of the above compounds which are supposed to involve infinite chains of a type, - - -X–Mm–X- - -Mn- - -X–Mm–X- - - -, have been found to display absorption at longer wave-length than any of the respective component complexes. This absorption at the longer wave-length has been shown to be completely polarized along the direction of the supposed chains in the crystals. The above results show that in these crystals there would be rather strong interaction between the metal atoms through the anions along the infinite chains.