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Luminescent transition metal complexes are promising biomolecular probes as their photo\u2010physical properties are dependent on the surrounding environment. This makes it possible to differentiate between different environments and as a result, allows for identification of abnormalities in DNA. However, reliable computational protocols to predict optical properties of transition metal intercalators are limited, making accurate absorption spectra calculations essential for screening candidates. Here, we benchmark methods for computing UV\u2010Vis spectra of a Pt(II) pincer complex. The complex is studied both in isolation and intercalated in a small DNA model, representing probes designed to target DNA\u2010associated molecular abnormalities. We find that the Tamm\u2013Dancoff approximation (TDA) and the resolution of identity (RI) approximations provide a significant increase in speed for time\u2010dependent density functional theory (TD\u2010DFT) with only a modest loss of accuracy. Since geometry optimization is often the dominant cost, PBEh\u20103c emerges as an efficient alternative to conventional density functional theory (DFT), introducing errors comparable to those from TDA. Tight\u2010binding methods (GFN\u2010xTB) offer further acceleration, but yield larger deviations in structures and UV\u2010Vis spectra; thus, unless extensive optimization is required, PBEh\u20103c provides the best balance between accuracy and efficiency. The largest source of uncertainty stems from the exchange\u2010correlation functional used in the TD\u2010DFT calculation, where we obtain good results with PBE0 based on PBEh\u20103c structures.<\/jats:p>","DOI":"10.1002\/jcc.70481","type":"journal-article","created":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T07:36:10Z","timestamp":1787038570000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Efficient Calculation of Absorption Spectra of Platinum Complexes Used as Luminescent Probes for Cancer Detection"],"prefix":"10.1002","volume":"47","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-9787-1428","authenticated-orcid":false,"given":"Lena T. 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