Abstract
Herein, we report the synthesis of eight new mononuclear and binuclear Co2+, Ni2+, Cu2+, and Zn2+ methoxy thiosemicarbazone (MTSC) complexes aiming at obtaining thiosemicarbazone complex with potent biological activity. The structure of the MTSC ligand and its metal complexes was fully characterized by elemental analysis, spectroscopic techniques (NMR, FTIR, UV-Vis), molar conductivity, thermogravimetric analysis (TG), and thermal differential analysis (DrTGA). The spectral and analytical data revealed that the obtained thiosemicarbazone-metal complexes have octahedral geometry around the metal center, except for the Zn2+-thiosemicarbazone complexes, which showed a tetrahedral geometry. The antibacterial and antifungal activities of the MTSC ligand and its (Co2+, Ni2+, Cu2+, and Zn2+) metal complexes were also investigated. Interestingly, the antibacterial activity of MTSC- metal complexes against examined bacteria was higher than that of the MTSC alone, which indicates that metal complexation improved the antibacterial activity of the parent ligand. Among different metal complexes, the MTSC- mono- and binuclear Cu2+ complexes showed significant antibacterial activity against Bacillus subtilis and Proteus vulgaris, better than that of the standard gentamycin drug. The in silico molecular docking study has revealed that the MTSC ligand could be a potential inhibitor for the oxidoreductase protein.
Highlights
Infectious diseases caused by various bacterial fungal and viral pathogens are of high socioeconomic and medical importance worldwide
Except for methoxy thiosemicarbazone (MTSC)-Co2+ complexes, the MTSC ligand and its metal complexes possess a considerable antifungal activity against Candida albicans fungi
The MTSC ligand was used to synthesize a set of eight new mononuclear and binuclear Co2+, Ni2+, Cu2+, and Zn2+ metal complexes
Summary
Infectious diseases caused by various bacterial fungal and viral pathogens are of high socioeconomic and medical importance worldwide. Among the infectious diseases that are very challenging to treat, biofilm-associated pathogens are one of the most dangerous. The exclusive physiology and intricate structure of the biofilm cells contribute to their resistance to host immune response, environmental conditions, and antimicrobial agents [1]. These infections are commonly treated with broad-spectrum antibiotics. Molecules 2021, 26, 2288 Molecules 2021, 26, x FOR PEER REVIEW 2 of 18 2 of 18. These broad-spectrum antibiotics have side effects, such as affecting the normal mthiecrnoobrimalafll omraicraonbdiailnfdlourcainagndanintdibuiocitnicgraenstisibtaiontcice r[e2s]i.stTahnecree[f2o]r.eT, hthereefdoirsec,otvheerydioscfonveewry aonftnimewicraonbtiiaml idcruobgisalwditrhugasnwoivtehl amnoodveelomf aocdtieoonfiascutirognenistluyrngeendtleydn. TThhiioosseemmiiccaarrbbaazzoonneeddeerriivvaattiivveessaanndd tthheeiirr mmeettaall ccoommpplleexxeess hhaavvee bbeeeenn eexxtteennssiivveellyy eexx-pplloorreeddiinnpphhaarrmmaaccoollooggyy dduueettootthheeirirbbrrooaaddssppeecctrtruummooffbbioiolologgicicaallaacctitvivitiiteiess,,ininccluluddiningg aannttiimmiiccrroobbiaial,l,aanntitcicaanncecer,ra, nadndanatnivtivrairlaalcaticvtitviietsie[s3–[131–]1.1T].hTiohsieomseimcaircbaarzboanzeosnaerseakrneokwnnowton htoavheaavegeangeeranlefroarlmfourlma uoflaRo1Rf R2C1R=2NC-=NNH-N-CH=-SC-=NSR-N3RR43,Rw4,hwichhicmhamkeaktheetmhesmignsigfincaifnictadnotndoorlnigoarnldigsatnhdrsouthgrhouthgehirthheyidr rhayzdinraezniniterongiternogaenndasnudlfusurlafutormatso. mThs.eTyhceayncaalnsoaclsooocrdooinradtienatse masumltiu-dltei-ndteantetalitgealnigdasnddespdeenpdeinndginong tohnetphreepsernesceenocfeootfheorthheertehreotaetroomatso,mwsh, iwchhiccahncaacnt aacst daosndaotninagticnegncteernstetorsftoormforcmomcopmlexpelesxwesitwh idthiffderifefnetrecnotocrdooinradtiinoantigoenogmeeotmrieestr.iTesh.iTosheimosiecmari-bcaazrboanzeosnceasnccaonocrodoinrdaitneaatse baisdbeindteanttealtieglaignadnsdwsiwthitthhtehceecnetnratrlaml meteatlailoinonasasnneeuutrtaral lththioionnee ffoorrmmoorraanniioonniicctthhiioollaatteeffoorrmmttoopprroovviiddeeaafifvivee--mmeemmbbeerreeddcchheelalatitninggrriningg(S(Scchheemmee11) )[1[122].]
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