Free jet absorption millimeter wave spectrum of pyrrolidine: Assignment of a second, equatorial, the most stable conformer

被引:33
作者
Caminati, W [1 ]
Dell' Erba, A [1 ]
Maccaferri, G [1 ]
Favero, PG [1 ]
机构
[1] Univ Bologna, Dipartimento Chim G Ciamician, I-40126 Bologna, Italy
关键词
D O I
10.1006/jmsp.1998.7602
中图分类号
O64 [物理化学(理论化学)、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号
070203 ; 070304 ; 081704 ; 1406 ;
摘要
The equatorial conformer of pyrrolidine has been discovered while investigating the rotational free jet spectrum of the pyrrolidine-water adduct. It is more stable than the axial species, previously assigned with conventional microwave spectroscopy (W. Caminati, Il. Oberhammer, G. Pfafferott, R. R. Filgueira, and C. H. Gomez, 1984. J. Mel. Spectrosc., 106, 217-266). The assignment of the equatorial conformer was missed in that microwave investigation because of the accidentally zero or almost zero value of its mu(a) dipole moment component; its low J mu(c)-type transitions, very weak in the room temperature spectrum, are the strongest lines in the jet. (C) 1998 Academic Press.
引用
收藏
页码:45 / 48
页数:4
相关论文
共 24 条
[1]   RING PUCKERING IN 5 MEMBERED RINGS - MICROWAVE-SPECTRUM DIPOLE-MOMENT AND BARRIER TO PSEUDOROTATION IN 1,3-DIOXOLANE [J].
BARON, PA ;
HARRIS, DO .
JOURNAL OF MOLECULAR SPECTROSCOPY, 1974, 49 (01) :70-81
[2]   CONFORMATION, HYDROGEN-BONDING AND LARGE-AMPLITUDE MOTION INVESTIGATION OF N-METHYLETHYLEDIAMINE BY MICROWAVE SPECTROSCOPY [J].
CAMINATI, W ;
FANTONI, AC ;
VELINO, B .
JOURNAL OF MOLECULAR STRUCTURE, 1987, 157 (04) :385-398
[3]   THE MICROWAVE-SPECTRUM OF PYRROLIDINE [J].
CAMINATI, W ;
OBERHAMMER, H ;
PFAFFEROTT, G ;
FILGUEIRA, RR ;
GOMEZ, CH .
JOURNAL OF MOLECULAR SPECTROSCOPY, 1984, 106 (01) :217-226
[4]   Conformation and stability of adducts of cyclic ammines with water: Free jet absorption millimeter-wave spectrum of pyrrolidine-water [J].
Caminati, W ;
Dell'Erba, A ;
Maccaferri, G ;
Favero, PG .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1998, 120 (11) :2616-2621
[5]   MICROWAVE-SPECTRUM, CONFORMATION AND METHYL TOP INTERNAL-ROTATION BARRIER OF N-METHYLPYRROLIDINE [J].
CAMINATI, W ;
SCAPPINI, F .
JOURNAL OF MOLECULAR SPECTROSCOPY, 1986, 117 (02) :184-194
[6]   ASSIGNMENT OF A 3RD CONFORMER OF N-METHYL ETHYLENEDIAMINE BY FREE-JET ABSORPTION MICROWAVE SPECTROSCOPY [J].
CAMINATI, W ;
FAVERO, PG ;
MILLEMAGGI, A ;
FAVERO, LB ;
MELANDRI, S .
JOURNAL OF MOLECULAR SPECTROSCOPY, 1995, 171 (02) :385-393
[7]  
Caminati W., UNPUB
[8]   SPECTRA AND STRUCTURE OF SMALL-RING MOLECULES .33. MICROWAVE-SPECTRUM OF SILACYCLOPENTANE [J].
DURIG, JR ;
LAFFERTY, WJ ;
KALASINSKY, VF .
JOURNAL OF PHYSICAL CHEMISTRY, 1976, 80 (11) :1199-1202
[9]   RING PUCKERING IN 5-MEMBERED RINGS .2. MICROWAVE SPECTRUM DIPOLE MOMENT AND BARRIER TO PSEUDOROTATION IN TETRAHYDROFURAN [J].
ENGERHOLM, GG ;
LUNTZ, AC ;
GWINN, WD ;
HARRIS, DO .
JOURNAL OF CHEMICAL PHYSICS, 1969, 50 (06) :2446-+
[10]   RELATIVE INTENSITY MEASUREMENTS IN MICROWAVE SPECTROSCOPY [J].
ESBITT, AS ;
WILSON, EB .
REVIEW OF SCIENTIFIC INSTRUMENTS, 1963, 34 (08) :901-&