The controlled release of functionally active compounds is important in a variety of applications. Here, we have synthesized, characterized, and studied the magnetic properties of three novel metal-metal-bonded tris(formamidinato) Ru complexes. We have used different auxin-related hormones, indole-3-acetate (IAA), 2,4-dichlorophenoxyacetate (2,4-D), and 1-naphthaleneacetate (NAA), to generate [RuCl(μ-DPhF)(μ-IAA)] (), [RuCl(μ-DPhF)(μ-2,4-D)] (), and [RuCl(μ-DPhF)(μ-NAA)] () (DPhF = ,'-diphenylformamidinate). The crystal structures of , , , and have been determined by single-crystal X-ray diffraction. To assess the releasing capacity of the bound hormone, we have employed a biological assay that relied on plants expressing an auxin reporter gene and we demonstrate that the release of the phytohormones from , , and is pH- and time-dependent. These studies serve as a proof of concept showing the potential of these types of compounds as biological molecule carriers.
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