NUCLEAR MAGNETIC-RELAXATION DISPERSION PROFILES OF AQUEOUS-SOLUTIONS OF A SERIES OF GD(NOTA) ANALOGS

被引:17
作者
GERALDES, CFGC
BROWN, RD
BRUCHER, E
KOENIG, SH
SHERRY, AD
SPILLER, M
机构
[1] UNIV TEXAS,DEPT CHEM,POB 830688,RICHARDSON,TX 75083
[2] IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598
[3] UNIV COIMBRA,DEPT CHEM,P-3000 COIMBRA,PORTUGAL
[4] LAJOS KOSSUTH UNIV,DEPT CHEM,H-4010 DEBRECEN 10,HUNGARY
关键词
D O I
10.1002/mrm.1910270208
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
Nuclear magnetic relaxation dispersion (NMRD) profiles and ESR linewidths have been measured for a series of neutral Gd3+ ‐triazamacrocyclic complexes and compared with previous data for the simplest member of the macrocyclic triaza series, Gd(NOTA), and for the widely studied linear triaza complex, Gd(DTPA)2‐. Water proton relaxivities and their temperature dependence were found to vary widely with the size of the triaza macrocycle and the identity of the side‐chain chelating groups. The number of rapidly exchanging water molecules directly coordinated to the Gd3+ ion (q) was found to vary from 2 to 4 for eight of the ten complexes examined and a linear relationship between the 50‐MHz relaxivity value and integral values of q is presented for this series of complexes. τs values derived from ESR linewidths for some of the complexes are in reasonable agreement with those derived from their NMRD profiles; however, those complexes which either tended to form aggregates in solution or gave evidence for multiple averaged solution structures showed broad, near Lorentzian linewidths which were clearly not dominated by the electron spin relaxation time (τs). Copyright © 1992 Wiley‐Liss, Inc., A Wiley Company
引用
收藏
页码:284 / 295
页数:12
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