Fabrication of nano- to microscopic-scale inorganic materials with special size and morphology are of great interest for materials chemistry due to their importance in basic scientific research and potential technological applications. In the past few decades, there has been an increasing number of reports on the synthesis of inorganic crystals, such as rods, wires, plates, tubules,dendrites.Of these shapes, hierarchical dendrites have attracted much attention stimulated by the practical importance related to some fractal growth phenomena. Studies on the shape control of inorganic crystals will to some extent give insights into the crystallization behavior in a nano- or micro-sized scale owing to the traditional lack of understanding of the growth history and shape evolution process. In this work, the morphology of TlCl crystals grown at the liquid-liquid interface between TlSO₄ ant HCl solutions was investigated in the presence of various porphyrin molecules. The addition of TPPS porphyrin molecules changed the morphology from spherical to single-crystalline wires with a width of 100-2000 nm. The addition of TPPyP changed morphology of TlCl crystals into branching dendrites. The presence of different porphyrins molecules in the crystallization medium significantly influenced the morphology of the crystals. Crystals of TlCl with elongated rod-type or branching superstructures were nucleated with high aspect ratios depending on porphyrin type was used. The composition ant microstructure of dendrites was investigated by X-ray technique, SEM and AFM. The wires were produced by elongation and stacking of planar TlCl crystals exhibiting {100} faces. The anisotropic growth behavior causing the wire formation is tentatively ascribed to stepwise capping of the specific surfaces of TlCl crystals by porphyrin molecules.

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