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New dimeric, trimeric and tetrameric quaternary ammonium salts were accomplished by reaction of tertiary alkyldimethyl amines with appropriate bromomethylbenzene derivatives. A series of new cationic surfactants contain different alkyl chain lengths (C4-C18), aromatic spacers and different numbers of quaternary nitrogen atoms. The structure of the products was confirmed by spectral analysis (FT-IR, ¹H-NMR, 13 C-NMR and 2D-NMR), mass spectroscopy (ESI-MS), elemental analysis, as well as PM5 semiempirical methods. Compound ( 21 ) was also analyzed using X-ray crystallography. Critical micelle concentration (CMC) of 1,4-bis-[ N -(1-alkyl)- N , N -dimethylammoniummethyl]benzene dibromides ( 3 - 9 ) was determined to characterize the aggregation behavior. The antimicrobial properties of novel QACs (Quaternary Ammonium Salts) were examined to set their minimal inhibitory concentration (MIC) values against fungi Aspergillus niger , Candida albicans , Penicillium chrysogenum and bacteria Staphylococcus aureus , Bacillus subtilis , Escherichia coli and Pseudomonas aeruginosa .

Synthesis, Structure, Surface and Antimicrobial Properties of New Oligomeric Quaternary Ammonium Salts with Aromatic Spacers