Christa Seipelt

National University of Distance Education

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Manfred Zeidler

Westfälische Hochschule

Paloma Ballesteros

National University of Distance Education

Andreas Dölle

RWTH Aachen University

Thomas M. Kirschgen

RWTH Aachen University

F. H. Cano

Consejo Superior de Investigaciones Científicas

I. Fonseca

Virginia Tech

Pilar López‐Larrubia

Instituto de Investigaciones Biomédicas Sols-Morreale

Sebastián Cerdán

Instituto de Investigaciones Biomédicas Sols-Morreale

Paula Zaderenko

Universidad Pablo de Olavide

Pilar López

Northwestern University

Cooperative Institutions

RWTH Aachen University

Westfälische Hochschule

Consejo Superior de Investigaciones Científicas

Universidad Complutense de Madrid

Instituto de Química Orgánica General

National University of Distance Education

Universidad San Pablo CEU

Universidad Autónoma de Madrid

FH Aachen

Instituto de Investigaciones Biomédicas Sols-Morreale

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N-2-(Azol-1(2)-yl)ethyliminodiacetic acids: a novel series of Gd(III) chelators as T2 relaxation agents for magnetic resonance imaging

Bioorganic & Medicinal Chemistry (1999)

Pilar López‐Larrubia Christa Seipelt Patrick J. Merkling László Sturz José Luis García-Álvarez

10.1016/s0968-0896(98)00273-9

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Citations (22)

Reduction of the isolated double bond in bis(N-alkenylbenzimidazole)Pd(II) complexes with KBH4

Tetrahedron Letters (1999)

Christa Seipelt Pilar López‐Larrubia Thomas M. Kirschgen Andreas Dölle Manfred Zeidler

Benzimidazole

Vicinal

Oxidative addition

Inert

10.1016/s0040-4039(98)02679-3

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Citations (7)

ChemInform Abstract: Reduction of the Isolated Double Bond in Bis(N‐alkenylbenzimidazole)Pd(II) Complexes with KBH₄.

ChemInform (1999)

Christa Seipelt Pilar López Thomas M. Kirschgen A. DOELLE Manfred Zeidler

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

10.1002/chin.199920103

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Molecular dynamics of hydantoins and barbiturates assessed by¹H,¹³C and¹⁵N relaxation data

Journal of the Chemical Society. Perkin transactions II (1995)

Petra Gruhlke Christa Seipelt Andreas Dölle Manfred Zeidler Paula Zaderenko

The molecular dynamics of hydantoin,5,5-dimethylhydantoin,5,5-diphenylhydantoin, barbituric acid and 5-ethyl-5-phenylbarbituric acid in solution are determined to investigate the molecular basis for the activity of these neuroactive drugs. From dipolar 13C and 15N spin-lattice relaxation times the correlation times for the rotational dynamics of specific bond vectors are evaluated. Conclusions can be drawn concerning the anisotropy of the overall molecular rotational motion and the internal rotations of molecular segments. The translational molecular diffusion coefficients are obtained from self diffusion measurements by the pulsed gradients method. The observed differences in the dynamics as well as structural differences may account for the variation in the neuroactivity of the studied compounds.

Hydantoin

Rotational diffusion

Barbituric acid

Molecular geometry

10.1039/p29950002191

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Citations (4)

Correlation Times and Quadrupole Coupling Constants in Liquid N‐Methylformamide and N‐Methylacetamide

Berichte der Bunsengesellschaft für physikalische Chemie (1997)

Christa Seipelt Manfred Zeidler

Abstract Longitudinal 1 H, 13 C and 15 N nmr relaxation rates were measured in the liquid phase for N‐methylformamide (NMF) over the temperature range 228–328 K and for N‐methylacetamide (NMA) over the range 300–378 K. Rotational correlation times were determined for the formyl C‐H and the N‐H bonds. The motion of both molecules is anisotopic, particularly that of N‐methylacetamide. The activation energies are 5.6 kJ/mol for C‐H and 19.7 kJ/mol for N‐H in NMF and 20.4–22.5 kJ/mol for N‐H in NMA. Quadrupole coupling constants were determined by relaxation measurements for the nuclei 14 N and 2 H. The quadrupole coupling constant for the amide deuteron in NMF is temperature dependent and varies from 193 to 206 kHz. For NMA this quadrupole coupling constant falls into the range 178 to 238 kHz. The quadrupole coupling constant for the formyl 2 H in NMF (151–169 kHz) is temperature independet while for the 14 N (NMF: 1.85–2.40 MHz; NMA: 1.65–2.45 MHz) it is temperature dependent.

Coupling constant

Atmospheric temperature range

10.1002/bbpc.199700013

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Citations (13)