25 different SCO CP-dBCP nanocomposites have been prepared utilizing the five before mentioned dBCPs through the incorporation of a SCO CP employing a different number of reaction cycles (5 samples each). A complete sample overview is given in Table . The reaction procedure is as follows: The diblock copolymer and the iron(II) complex [FeL(MeOH)2] were dissolved in THF and heated to reflux for 2 h. After cooling, the bridging ligand 4,4'-bipyridine (bipy) was added and the reaction mixture was refluxed for another 1 h. At this stage, the solvent was either removed by cold distillation to yield a brown solid (1 cycle), or up to four additional cycles of simultaneous addition of the iron(II) complex and the bridging ligand and a subsequent heating to reflux for 1 h followed. Thus, nanocomposites with 3 to 5 cycles have been prepared. The numbers 1 to 5 of the sample notation correspond to the used dBCP, while the cycle count (1, 3, 4, and 5) is denoted by the letters a to d. Additionally, samples with five cycles were prepared with a reduced amount of the bridging ligand bipy to investigate the impact of the ligand excess on the confined coordination polymer formation. Please note that for the bulk material no impact of the bipy excess on the magnetic properties was observed, but for the nanocomposite particles this might be different. These samples are labeled with the letter e. The influence of the incorporation of the CP on the size and shape of the nanocomposite particles in comparison to the neat PS-b-P4VP micelles was investigated by TEM, cryo-TEM, and DLS, whereas the influence of the different particle sizes and shapes on the magnetic properties was analyzed by magnetic susceptibility measurements and (temperature-dependent) Fe Mössbauer spectroscopy. Further characterization was performed by (temperature-dependent) powder X-ray diffraction ((T-)PXRD), scanning electron microscopy (SEM), elemental analysis, and infrared (IR) spectroscopy. The detailed characterization of the samples 1-5e is given in the following as typical representatives, while the characterization of the samples 1a-d, 2a-d, 3a-d, 4a-d, and 5a-d is given in the Supporting Information. SV-61 5 rods/worm 214 ± 75 60 ± 8 84 ± 10 a) Samples were also characterized by TEM, DLS, and SEM after thermal annealing (see Table ).