Fixation mode of gold(III) in [Cd{S2CN(CH2)4O}2]n-[AuCl4]−/2 M HCl chemisorption system: Preparation, supramolecular self-organization and thermal behavior of the heteropolynuclear complex ([Au{S2CN(CH2)4O}2]2[CdCl4] · H2O)n