“…In particular,t he treatment of transition metals is limited or even impossible in many SQM methods.T his is contradicting the importance of transition metals in numerous and diverse areas of chemistry,partly involving very large or extended molecular or periodic systems.E xamples are supramolecular organometallic aggregates such as metalorganic polyhedra (MOPs) or macrocycles (MOMs), metalorganic frameworks (MOFs), and metal-containing biomolecules,s uch as metalloproteins or ac ombination to metal-biomolecule frameworks (MBioFs). [16,17] Thep otential field of application for efficient SQM methods is correspondingly large.However,universally applicable methods that are fully parameterised for transition metals are mostly limited to two method families,namely the already frequently used neglect of diatomic differential overlap (NDDO) based PMx (parametric method x)m ethods [4][5][6] and the recently introduced extended tight-binding methods GFNn-xTB, [1,2] (geometries,vibrational frequencies, and noncovalent interactions extended tight binding) from our laboratory.The robustness and quality of the GFNn-xTB methods has already been demonstrated in numerous applications with apredominant focus on organic chemistry.These applications include simulations of electron ionisation mass spectra, [18] fully automated computation of spin-spin-coupled nuclear resonance spectra, [19] including conformer-rotamer ensemble generation, atomic charge generation for the new D4 dispersion correction, [20,21] geometry optimisation of lanthanoid complexes, [22] automated determination of protonation sites, [23] pK a calculation in the SAMPL6 blind challenge, [24] metadynamics-based exploration of chemical compound conformation and reaction space, [25] and few studies on organometallic systems. [16,17] Thep otential field of application for efficient SQM methods is correspondingly large.However,universally applicable methods that are fully parameterised for transition metals are mostly limited to two method families,namely the already frequently used neglect of diatomic differential overlap (NDDO) based PMx (parametric method x)m ethods [4][5][6] and the recently introduced extended tight-binding methods GFNn-xTB, [1,2] (geometries,vibrational frequencies, and noncovalent interactions extended tight binding) from our laboratory.The robustness and quality of the GFNn-xTB methods has already been demonstrated in numerous applications with apredominant focus on organic chemistry.These applications include simulations of elect...…”