Organic molecules present advantages in performance, tunability and applications for a wide range of semiconductor technology, recently commercially demonstrated with organic field effect transistors (OFET) and organic light emitting diodes (OLED). Advantages of organic semiconductors can be applied to the emerging fields of quantum information processing and spintronic applications. Metal phthalocyanines are a class of organic molecules exhibiting favourable electronic and magnetic properties. Combined with high thermal and chemical stability, as well as the ability to self-assemble into organised structures, they are ideal for thin film architecture, compatible with industrial mass production. Mixed films of vanadyl phthalocyanine (VOPc) diluted in a zinc phthalocyanine (ZnPc) host matrix were produced by molecular beam deposition. Exceptionally long spin coherence lifetimes over a wide temperature range are exhibited, making it a promising candidate for prospective quantum information processing applications. Thin film properties were optimised though varying stoichiometry and molecular orientation through use of a templating layer of PTCDA. Improved spin coherence comparing thin film and powder analogues is attributed to structural order impacting active decoherence mechanisms. Ferromagnetism is shown by neat films of FePc, combined with high charge mobility. To investigate new molecular materials with the aim of achieving high temperature magnetism for spintronic applications, mixed films of iron phthalocyanine (FePc) and VOPc were produced. Favourable intermolecular interactions are used to induce an ordered alternating superstructure. The effectiveness of this strategy was investigated by structural and magnetic analysis, varying stoichiometry, temperature, and molecular orientation. All parameters were found to have a profound impact on the magnetisation and coercivity observed. Trends in magnetic coupling provides further evidence for the proposed structure adopted and considerations for future investigations into spin systems adopting ordered superstructures in mixed molecular thin films.