Abstract: Study on Mass Spectra of Multifunctional Group Molecules(Ⅴ)-The Positive Spectra of Chemical Ionization of Asymmetrical Molecules(i-C_4H_(10))Zhang Zhanwang(Henan Institute of Chemistry, Zhengzhou 450003,China)Li Yiyu;Ding Shiyue(Testing Technology institute of Zhejiang Province,Hangzhou 310012,China)Ma Jianbiao(Institute of Polymer Chemistry,Nankai University,Tianjin 300071,China)Received Abstract:The positive ions spectra of chemical ionization of multifunctional group molecules 2,4 (CnH2n+1 )2NCH2(n-C12H25 )C6H3OH,n=1,2,3,4,5 were determined.The main conclusions are as follows:(1) the abundances of M+'are mor than 10% and decrease with the increase of n in alkyl(CnH2n+1 )of their molecules;(2)the proton-molecule ion peaks are always base peaks(n=1,2,3,4),they can be shown by the fomula 320+28(n=1)(n=1,2,3,4);(3)the abundance of peaks M-H J +(≤5%)is weak in all of 5 pounds(I~ V);(4)the abundance ratio of the increase of n in alkyl(CnH2n+1 )of their molecules;(5)the curves I% m/z(M+aH)~a(a=0,1,2,3)show that the more the number of protonation with molecules is,the weaker and unstabler protonation peak with molectlls is;(6) the weaker abundance at ZM + aH peaks was determined(a= 1,2,3),it was shown that the relative peaks at ZM +aH.of them occured.Keywords:multifunctional group molecules;chemical ionization;asymmetrical molecules