We have synthesized first novel dihexadecyl
phosphate (DHGP-n) gemini surfactants
containing alkyl chain ((CnH2n); n = 3,4,5,and 6) spacers. Surfactants were used to form monolayers
on water surface. Surface tension measurement (STm), Brewster angle microscopy
(BAM), and density functional theory (DFT) calculation were used to investigate
these monolayers. Surface pressure (π) and molecular area (A); π-A isotherm curves of all DHGP-n gemini surfactants showed a gradual
increase in surface pressure without any break points in the curves, confirmed
the formation of liquid-expand (LE) type monolayers. BAM observations also
supported the STm results. Limited molecular area (A0) of these monolayers depended on the spacer of gemini
surfactants without spacern = 4. Longer alkyl chain spacer in the
series had higher value of A0 in
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