INVESTIGATION OF PORPHYRINS AND METALLOPORPHYRINS BY FAST-ATOM-BOMBARDMENT MASS-SPECTROMETRY

被引：16

作者：

NAYLOR, S ^{[1
]}

LAMB, JH ^{[1
]}

HUNTER, CA ^{[1
]}

COWAN, JA ^{[1
]}

SANDERS, JKM ^{[1
]}

机构：

[1] UNIV CAMBRIDGE,DEPT CHEM,CAMBRIDGE CB2 1EW,ENGLAND

来源：

ANALYTICA CHIMICA ACTA | 1990年 / 241卷 / 02期

关键词：

PORPHYRINS; METALLOPORPHYRINS;

D O I：

10.1016/S0003-2670(00)83658-2

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The use of fast atom bombardment mass spectrometry (FAB-MS) to study a series of porphyrins (H2P) and metalloporphyrins (MetP) was investigated. Methods of sample preparation and choice of a suitable matrix for optimum FAB-MS studies of porphyrins are described. Rates of demetallation and the redox chemistry of such compounds were examined and the solution chemistry of metalloporphyrins was compared with their behaviour in FAB-MS. Such considerations lead to an understanding of various aspects of the physico-chemical events occurring in the FAB matrix. By using FAB matrices with different electronic or acidic properties, it was demonstrated that demetallation can occur either by proton displacement or one-electron reduction of the metal. It was also found that demetallation by protons in FAB-MS correlates with the stability index (S(i). One-electron reductions of Ag(II)P and Cu(II)P were shown to occur via an excited-state intermediate. Consideration of fragmentation and metal ion uptake by two multi-component porphyrins in FAB-MS also confirmed the previously assigned geometry of these compounds.

引用

页码：281 / 287

页数：7

共 18 条

[1] POSITIVE AND NEGATIVE-ION FAST ATOM BOMBARDMENT MASS-SPECTROMETRIC STUDIES ON CHLOROPHYLLS - STRUCTURE OF 4-VINYL-4-DESETHYL CHLOROPHYLL-B [J].