The complexity of isomeric states of metallated species, such as metal complexes, coordination polymers, and self-assembled clusters make them challenging to experimentally characterise. Ion mobility-mass spectrometry (IM-MS) is well suited to characterise such complexity. IM-MS not only allows the separation of isomers, but with low field IM-MS, collision cross sections (CCS) can be derived. In this talk I will discuss how the structure of metal complexes and metallated clusters of ligands, organic pollutants such as pesticides, and supramolcular cages can be investigated using low field IM-MS, for both separation and CCS. Tandem experimental approaches are key to effective characterisation. The conformational landscape of the ions is computationally explored using various DFT approaches to generate candidates. Our aim is to both further the understanding of the intrinsic properties of the gas phase metal complexes themselves; and the methods needed to analyse species exhibiting such a wide range of potential complexity. In particular, we seek to further develop the use of CCS for analysing the complexity of metal containing species. In particular, I will discuss the use of IM-MS to look at structural families, rather than isolated structures alone.