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Single crystal flower-like magnetite nanoparticles (NPs) were formed by thermal decompn. of iron acetylacetonate in the presence of polyphenylenepyridyl dendrons and dendrimers at 290 C. The size of the flower-like NPs varies in the range12-31 nm depending on the dendron/dendrimer structure and concn. The 21 nm flower-like NPs demonstrate unusual magnetic properties with a blocking temp. of 300 K, revealing ferromagnetism at room temp. Such unusual NP morphol. is attributed to self-assembling of dendrons and dendrimers in soln. which was studied using small angle X-ray scattering. The degree of self-assembling is dependent on the dendron/dendrimer structure and concn.