# Steric, Activation Method and Solvent Effects on the Structure of Paddlewheel Diruthenium Complexes
## 4 Conclusions  
The use of the methoxybenzoate ligands has allowed the isolation of diruthenium species as linear polymers (**1a**) zig-zag chains (**2** and **3**), discrete molecules (**1b**) and a salt in which the cation and the anion are diruthenium complexes (**1c**). These arrangements have been found previously, but it is the first time that all of them are obtained with the same ligand. The presence of a -OMe substituent in different positions in the phenyl ring must be the cause of the structural diversity found in these complexes. Thus, polymeric compounds of the type [Ru\({}_{2}\)Cl(\(\mu\)-O\({}_{2}\)CC\({}_{6}\)H\({}_{4}\)-OMe)\({}_{4}\)]\({}_{\rm In}\) (**1a**, **2** and **3**) with chloride ions bridging the diruthenium units have been prepared independently of the position of the -OMe groups in the phenyl ring. However, the steric influence of the -OMe group in _ortho_ is crucial to obtain compounds **1a**, **1b** and **1c** with different arrangements depending on the synthetic procedure and reaction conditions. Conventional synthesis is the most suitable to obtain compounds **2** and **3**, whereas compounds **1b** and **1c** have been prepared only by solvothermal synthesis. This work demonstrates how important the control of the variables in play is in order to design the required structure for a particular application of the diruthenium species.  
The following are available online at [[https://www.mdpi.com/article/10.3390/app12031000/s1](https://www.mdpi.com/article/10.3390/app12031000/s1)]([https://www.mdpi.com/article/10.3390/app12031000/s1](https://www.mdpi.com/article/10.3390/app12031000/s1)): Figure S1: 0 angles between carboxylate plane and aromatic ring plane in **1b**. Figure S2: Temperature dependence of the molar susceptibility (o) and magnetic moment (\(\Delta\)) for compound [Ru\({}_{2}\)Cl(\(\mu\)-O\({}_{2}\)CC\({}_{6}\)H\({}_{4}\)-\(m\)-OMe)\({}_{4}\)]\({}_{\rm In}\) (**2**). Figure S3: Temperature dependence of the molar susceptibility (o) and magnetic moment (\(\Delta\)) for compound [Ru\({}_{2}\)Cl(\(\mu\)-O\({}_{2}\)CC\({}_{6}\)H\({}_{4}\)-\(m\)-OMe)\({}_{4}\)]\({}_{\rm In}\) (**3**).  
Figure 5: Temperature dependence of the molar susceptibility (o) and magnetic moment (\(\Delta\)) for compound [Ru\({}_{2}\)Cl(\(\mu\)-O\({}_{2}\)CC\({}_{6}\)H\({}_{4}\)-\(m\)-OMe)\({}_{4}\)]\({}_{\rm In}\) (**1a**). Solid lines are the product of a least-square fit of the experimental data to the model indicated in the text and considering compound **1b** as the impurity.  
Figure S4: Temperature dependence of the molar susceptibility (o) and magnetic moment (\(\Delta\)) for compound [Ru\({}_{2}\)Cl((u-O\({}_{2}\)CC\({}_{6}\)H\({}_{4}\)-o-OMe)\({}_{4}\)]\({}_{\bf 1}\)n (**1a**). Table S1: 0 angles between carboxylate plane and aromatic ring plane in compounds **1b** and **1c**. Table S2: Angles between aromatic ring plane and methoxy substituent plane in compounds **1b** and **1c**.  
**Author Contributions:** [PERSON] and [PERSON] carried out the synthesis, supervised by [PERSON] and [PERSON]. Conceptualization: [PERSON], [PERSON] and [PERSON]; Characterization: [PERSON], [PERSON] and [PERSON]; Discussion of the results: all authors; [PERSON], [PERSON] and [PERSON] wrote the original draft, and [PERSON], [PERSON] and [PERSON] revised the final manuscript. All authors have read and agreed to the published version of the manuscript.  
**Funding:** This research was funded by Comunidad de Madrid (project B2017/BMD-3770-CM) and Ministerio de Ciencia e Innovacion (project CTQ2011-23066).  
**Conflicts of Interest:** The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses or interpretation of data; in the writing of the manuscript or in the decision to publish the results.