ACCORD-HMBC: advantages and disadvantages of static versus accordion excitation

Martin, Gary E.; Hadden, Chad E.; Crouch, Ronald C.; Krishnamurthy, V. V.

doi:10.1002/(sici)1097-458x(199908)37:8<517::aid-mrc501>3.0.co;2-w

Cited by 65 publications

(49 citation statements)

References 13 publications

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“…[30] The number of scans required for obtaining an SNR of at least 10 for all resonances is also indicated, given that the SNR values shown have been obtained using 144 scans (the QDEPT scheme must be recorded using multiples of 48 scans). [6] ACCORDEPT spectra have been sampled using 16 been added for comparison purposes. This spectrum exhibits aliphatic resonances that are significantly attenuated, as a result of the non-optimal accordion optimization.…”

Section: Resultsmentioning

confidence: 99%

Accordion‐optimized DEPT experiments

Furrer

Guerra

Deschenaux

2010

Magnetic Reson in Chemistry

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In this contribution, a pulse sequence is described for recording accordion-optimized DEPT experiments. The proposed ACCORDEPT experiment detects a wide range of one-bond coupling constants using accordion optimization. As a proof of concept, this strategy has been applied to a mesogen containing a large range of one-bond 1 J CH coupling constants associated with the various structural elements. The ACCORDEPT experiment afforded significant enhancements for the resonances with the larger 1 J CH couplings, similar SNR for aliphatic resonances, but reduced SNR for aliphatic resonances as compared with the standard DEPT experiment. In addition, the ACCORDEPT is straightforward to implement, does not require any supplementary calibration procedures and can be used under automated conditions without difficulty by inexperienced users.Supporting information may be found in the online version of this article.

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Section: Resultsmentioning

confidence: 99%

Accordion‐optimized DEPT experiments

Furrer

Guerra

Deschenaux

2010

Magnetic Reson in Chemistry

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“…We also tried to decrement the accordion delay during the acquisition as reported by Wagner and Berger 17 and Martin et al 18 for the ACCORD-HMBC but found no significant gain in the signal-to-noise ratio. This might result from the dominant (faster) relaxation of heteronuclear double-quantum magnetization (present during t 1 ) versus proton single-quantum magnetization (present during the accordion delay t acc ) for the system described.…”

Section: Resultsmentioning

confidence: 99%

The accordion-HMQC: heteronuclear correlations for a range of coupling constants

Zangger¹,

Armitage²

2000

Magn. Reson. Chem.

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“…In these experiments, signal intensity depends on sin(p n J(CH)D) and therefore cross-peaks emanating from small n J(CH) values (<2 Hz) usually present weak intensity or may even be absent. Many different approaches have been proposed to observe such weak/missing cross-peaks such as the use of different delay optimization or the use of the accordion approach combined with constant-time methods [16]. All these HMBC methods have been recently reviewed in depth [17].…”

Section: Introductionmentioning

confidence: 87%