多官能团分子质谱的研究(Ⅵ)──对称分子的正离子化学电离谱(i-C_4H_(10))

Study on the Mass Spectra of Multifunctional Groups Molecule(Ⅵ )-Positive Ions Chemical Ionization Mass Spectrum of Symmetric Molecules(i-C4H10)

摘要: 本文测定并解析了对称型多官能团分子2，6-二甲胺甲基-4-烷基（CnH2n＋1）苯酚〔n=2（Ⅰ）、4（Ⅱ）、8（Ⅲ）、10（Ⅳ）、12（Ⅴ）同系物的正离子化学电离谱，结果发现，由质子转移反应产生的（M＋H）+准分子峰都为基峰（Ⅰ）～（Ⅴ），扣除同位素丰度后，随着羟基对位上烷链（CnH2n+1)长短的变化,(M+H)+峰的相对风度仍无明显的变化,M+,(M-H)+峰为较弱丰度且与C4位上烷链(CnH2n+1)的长度变化无关,测得某些多质子离子如(M+3H)+其相对丰度随C4位上的增长而增加.

Abstract: 篢he mass spectra (CI)of 2, 6-bis (dimethyl-aminomethy)-4-alkylphe (CnH2n+1,n= 2, 4, 8, 10,12)with multifunctional groups in their symmetrical molecules have beeninterpreted and detected. It is found that all quasimolecular ions peaks(M+H)+are basepeaks, the relative abundance of all (M +H)+peaks from proton transfer have no obvious changes with increasement of alkyl chain(CnH2n+1 )localized C4 before and after subtracting isotopic abundance. The abundance of M+' and (M -H)+ peaks are weak andare not relative to length variation 完备 some ions such as (M +3H)+ increase with lengtheningalkyl chain (CnH2n+1 ).