---
_id: '12920'
abstract:
- lang: eng
text: The multicomponent approach allows to incorporate several functionalities
into a single covalent organic framework (COF) and consequently allows the construction
of bifunctional materials for cooperative catalysis. The well-defined structure
of such multicomponent COFs is furthermore ideally suited for structure-activity
relationship studies. We report a series of multicomponent COFs that contain acridine-
and 2,2’-bipyridine linkers connected through 1,3,5-benzenetrialdehyde derivatives.
The acridine motif is responsible for broad light absorption, while the bipyridine
unit enables complexation of nickel catalysts. These features enable the usage
of the framework materials as catalysts for light-mediated carbon−heteroatom cross-couplings.
Variation of the node units shows that the catalytic activity correlates to the
keto-enamine tautomer isomerism. This allows switching between high charge-carrier
mobility and persistent, localized charge-separated species depending on the nodes,
a tool to tailor the materials for specific reactions. Moreover, nickel-loaded
COFs are recyclable and catalyze cross-couplings even using red light irradiation.
article_number: e202202967
article_processing_charge: No
article_type: original
author:
- first_name: Michael
full_name: Traxler, Michael
last_name: Traxler
- first_name: Susanne
full_name: Reischauer, Susanne
last_name: Reischauer
- first_name: Sarah
full_name: Vogl, Sarah
last_name: Vogl
- first_name: Jérôme
full_name: Roeser, Jérôme
last_name: Roeser
- first_name: Jabor
full_name: Rabeah, Jabor
last_name: Rabeah
- first_name: Christopher
full_name: Penschke, Christopher
last_name: Penschke
- first_name: Peter
full_name: Saalfrank, Peter
last_name: Saalfrank
- first_name: Bartholomäus
full_name: Pieber, Bartholomäus
id: 93e5e5b2-0da6-11ed-8a41-af589a024726
last_name: Pieber
orcid: 0000-0001-8689-388X
- first_name: Arne
full_name: Thomas, Arne
last_name: Thomas
citation:
ama: Traxler M, Reischauer S, Vogl S, et al. Programmable photocatalytic activity
of multicomponent covalent organic frameworks used as metallaphotocatalysts. Chemistry
– A European Journal. 2023;29(4). doi:10.1002/chem.202202967
apa: Traxler, M., Reischauer, S., Vogl, S., Roeser, J., Rabeah, J., Penschke, C.,
… Thomas, A. (2023). Programmable photocatalytic activity of multicomponent covalent
organic frameworks used as metallaphotocatalysts. Chemistry – A European Journal.
Wiley. https://doi.org/10.1002/chem.202202967
chicago: Traxler, Michael, Susanne Reischauer, Sarah Vogl, Jérôme Roeser, Jabor
Rabeah, Christopher Penschke, Peter Saalfrank, Bartholomäus Pieber, and Arne Thomas.
“Programmable Photocatalytic Activity of Multicomponent Covalent Organic Frameworks
Used as Metallaphotocatalysts.” Chemistry – A European Journal. Wiley,
2023. https://doi.org/10.1002/chem.202202967.
ieee: M. Traxler et al., “Programmable photocatalytic activity of multicomponent
covalent organic frameworks used as metallaphotocatalysts,” Chemistry – A European
Journal, vol. 29, no. 4. Wiley, 2023.
ista: Traxler M, Reischauer S, Vogl S, Roeser J, Rabeah J, Penschke C, Saalfrank
P, Pieber B, Thomas A. 2023. Programmable photocatalytic activity of multicomponent
covalent organic frameworks used as metallaphotocatalysts. Chemistry – A European
Journal. 29(4), e202202967.
mla: Traxler, Michael, et al. “Programmable Photocatalytic Activity of Multicomponent
Covalent Organic Frameworks Used as Metallaphotocatalysts.” Chemistry – A European
Journal, vol. 29, no. 4, e202202967, Wiley, 2023, doi:10.1002/chem.202202967.
short: M. Traxler, S. Reischauer, S. Vogl, J. Roeser, J. Rabeah, C. Penschke, P.
Saalfrank, B. Pieber, A. Thomas, Chemistry – A European Journal 29 (2023).
date_created: 2023-05-08T08:25:34Z
date_published: 2023-01-18T00:00:00Z
date_updated: 2023-05-15T08:39:24Z
day: '18'
doi: 10.1002/chem.202202967
extern: '1'
intvolume: ' 29'
issue: '4'
keyword:
- General Chemistry
- Catalysis
- Organic Chemistry
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1002/chem.202202967
month: '01'
oa: 1
oa_version: Published Version
publication: Chemistry – A European Journal
publication_identifier:
eissn:
- 1521-3765
issn:
- 0947-6539
publication_status: published
publisher: Wiley
quality_controlled: '1'
scopus_import: '1'
status: public
title: Programmable photocatalytic activity of multicomponent covalent organic frameworks
used as metallaphotocatalysts
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 29
year: '2023'
...
---
_id: '12921'
abstract:
- lang: eng
text: Visible-light photocatalysis provides numerous useful methodologies for synthetic
organic chemistry. However, the mechanisms of these reactions are often not fully
understood. Common mechanistic experiments mainly aim to characterize excited
state properties of photocatalysts and their interaction with other species. Recently,
in situ reaction monitoring using dedicated techniques was shown to be well-suited
for the identification of intermediates and to obtain kinetic insights, thereby
providing more holistic pictures of the reactions of interest. This minireview
surveys these technologies and discusses selected examples where reaction monitoring
was used to elucidate the mechanism of photocatalytic reactions.
article_number: e202201583
article_processing_charge: No
article_type: original
author:
- first_name: Amiera
full_name: Madani, Amiera
last_name: Madani
- first_name: Bartholomäus
full_name: Pieber, Bartholomäus
id: 93e5e5b2-0da6-11ed-8a41-af589a024726
last_name: Pieber
orcid: 0000-0001-8689-388X
citation:
ama: Madani A, Pieber B. In situ reaction monitoring in photocatalytic organic synthesis.
ChemCatChem. 2023;15(7). doi:10.1002/cctc.202201583
apa: Madani, A., & Pieber, B. (2023). In situ reaction monitoring in photocatalytic
organic synthesis. ChemCatChem. Wiley. https://doi.org/10.1002/cctc.202201583
chicago: Madani, Amiera, and Bartholomäus Pieber. “In Situ Reaction Monitoring in
Photocatalytic Organic Synthesis.” ChemCatChem. Wiley, 2023. https://doi.org/10.1002/cctc.202201583.
ieee: A. Madani and B. Pieber, “In situ reaction monitoring in photocatalytic organic
synthesis,” ChemCatChem, vol. 15, no. 7. Wiley, 2023.
ista: Madani A, Pieber B. 2023. In situ reaction monitoring in photocatalytic organic
synthesis. ChemCatChem. 15(7), e202201583.
mla: Madani, Amiera, and Bartholomäus Pieber. “In Situ Reaction Monitoring in Photocatalytic
Organic Synthesis.” ChemCatChem, vol. 15, no. 7, e202201583, Wiley, 2023,
doi:10.1002/cctc.202201583.
short: A. Madani, B. Pieber, ChemCatChem 15 (2023).
date_created: 2023-05-08T08:25:55Z
date_published: 2023-04-06T00:00:00Z
date_updated: 2023-05-15T08:35:48Z
day: '06'
doi: 10.1002/cctc.202201583
extern: '1'
intvolume: ' 15'
issue: '7'
keyword:
- Inorganic Chemistry
- Organic Chemistry
- Physical and Theoretical Chemistry
- Catalysis
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1002/cctc.202201583
month: '04'
oa: 1
oa_version: Published Version
publication: ChemCatChem
publication_identifier:
eissn:
- 1867-3899
issn:
- 1867-3880
publication_status: published
publisher: Wiley
quality_controlled: '1'
scopus_import: '1'
status: public
title: In situ reaction monitoring in photocatalytic organic synthesis
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 15
year: '2023'
...
---
_id: '12919'
abstract:
- lang: eng
text: We report the visible light photocatalytic cleavage of trityl thioethers or
ethers under pH-neutral conditions. The method results in the formation of the
respective symmetrical disulfides and alcohols in moderate to excellent yield.
The protocol only requires the addition of a suitable photocatalyst and light
rendering it orthogonal to several functionalities, including acid labile protective
groups. The same conditions can be used to directly convert trityl-protected thiols
into unsymmetrical disulfides or selenosulfides, and to cleave trityl resins in
solid phase organic synthesis.
article_processing_charge: No
article_type: original
author:
- first_name: Sho
full_name: Murakami, Sho
last_name: Murakami
- first_name: Cosima
full_name: Brudy, Cosima
last_name: Brudy
- first_name: Moritz
full_name: Bachmann, Moritz
last_name: Bachmann
- first_name: Yoshiji
full_name: Takemoto, Yoshiji
last_name: Takemoto
- first_name: Bartholomäus
full_name: Pieber, Bartholomäus
id: 93e5e5b2-0da6-11ed-8a41-af589a024726
last_name: Pieber
orcid: 0000-0001-8689-388X
citation:
ama: Murakami S, Brudy C, Bachmann M, Takemoto Y, Pieber B. Photocatalytic cleavage
of trityl protected thiols and alcohols. Synthesis. 2023;55(09):1367-1374.
doi:10.1055/a-1979-5933
apa: Murakami, S., Brudy, C., Bachmann, M., Takemoto, Y., & Pieber, B. (2023).
Photocatalytic cleavage of trityl protected thiols and alcohols. Synthesis.
Georg Thieme Verlag. https://doi.org/10.1055/a-1979-5933
chicago: Murakami, Sho, Cosima Brudy, Moritz Bachmann, Yoshiji Takemoto, and Bartholomäus
Pieber. “Photocatalytic Cleavage of Trityl Protected Thiols and Alcohols.” Synthesis.
Georg Thieme Verlag, 2023. https://doi.org/10.1055/a-1979-5933.
ieee: S. Murakami, C. Brudy, M. Bachmann, Y. Takemoto, and B. Pieber, “Photocatalytic
cleavage of trityl protected thiols and alcohols,” Synthesis, vol. 55,
no. 09. Georg Thieme Verlag, pp. 1367–1374, 2023.
ista: Murakami S, Brudy C, Bachmann M, Takemoto Y, Pieber B. 2023. Photocatalytic
cleavage of trityl protected thiols and alcohols. Synthesis. 55(09), 1367–1374.
mla: Murakami, Sho, et al. “Photocatalytic Cleavage of Trityl Protected Thiols and
Alcohols.” Synthesis, vol. 55, no. 09, Georg Thieme Verlag, 2023, pp. 1367–74,
doi:10.1055/a-1979-5933.
short: S. Murakami, C. Brudy, M. Bachmann, Y. Takemoto, B. Pieber, Synthesis 55
(2023) 1367–1374.
date_created: 2023-05-08T08:25:08Z
date_published: 2023-05-01T00:00:00Z
date_updated: 2023-05-15T08:43:50Z
day: '01'
doi: 10.1055/a-1979-5933
extern: '1'
intvolume: ' 55'
issue: '09'
keyword:
- Organic Chemistry
- Catalysis
language:
- iso: eng
month: '05'
oa_version: None
page: 1367-1374
publication: Synthesis
publication_identifier:
eissn:
- 1437-210X
issn:
- 0039-7881
publication_status: published
publisher: Georg Thieme Verlag
quality_controlled: '1'
scopus_import: '1'
status: public
title: Photocatalytic cleavage of trityl protected thiols and alcohols
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 55
year: '2023'
...
---
_id: '13048'
abstract:
- lang: eng
text: In this paper we introduce a pruning of the medial axis called the (λ,α)-medial
axis (axλα). We prove that the (λ,α)-medial axis of a set K is stable in a Gromov-Hausdorff
sense under weak assumptions. More formally we prove that if K and K′ are close
in the Hausdorff (dH) sense then the (λ,α)-medial axes of K and K′ are close as
metric spaces, that is the Gromov-Hausdorff distance (dGH) between the two is
1/4-Hölder in the sense that dGH (axλα(K),axλα(K′)) ≲ dH(K,K′)1/4. The Hausdorff
distance between the two medial axes is also bounded, by dH (axλα(K),λα(K′)) ≲
dH(K,K′)1/2. These quantified stability results provide guarantees for practical
computations of medial axes from approximations. Moreover, they provide key ingredients
for studying the computability of the medial axis in the context of computable
analysis.
acknowledgement: "We are greatly indebted to Erin Chambers for posing a number of
questions that eventually led to this paper. We would also like to thank the other
organizers of the workshop on ‘Algorithms\r\nfor the medial axis’. We are also indebted
to Tatiana Ezubova for helping with the search for and translation of Russian literature.
The second author thanks all members of the Edelsbrunner and Datashape groups for
the atmosphere in which the research was conducted.\r\nThe research leading to these
results has received funding from the European Research Council (ERC) under the
European Union’s Seventh Framework Programme (FP/2007-2013) / ERC Grant Agreement
No. 339025 GUDHI (Algorithmic Foundations of Geometry Understanding in Higher Dimensions).
Supported by the European Union’s Horizon 2020 research and innovation programme
under the Marie Skłodowska-Curie grant agreement No. 754411. The Austrian science
fund (FWF) M-3073."
article_processing_charge: No
author:
- first_name: André
full_name: Lieutier, André
last_name: Lieutier
- first_name: Mathijs
full_name: Wintraecken, Mathijs
id: 307CFBC8-F248-11E8-B48F-1D18A9856A87
last_name: Wintraecken
orcid: 0000-0002-7472-2220
citation:
ama: 'Lieutier A, Wintraecken M. Hausdorff and Gromov-Hausdorff stable subsets of
the medial axis. In: Proceedings of the 55th Annual ACM Symposium on Theory
of Computing. Association for Computing Machinery; 2023:1768-1776. doi:10.1145/3564246.3585113'
apa: 'Lieutier, A., & Wintraecken, M. (2023). Hausdorff and Gromov-Hausdorff
stable subsets of the medial axis. In Proceedings of the 55th Annual ACM Symposium
on Theory of Computing (pp. 1768–1776). Orlando, FL, United States: Association
for Computing Machinery. https://doi.org/10.1145/3564246.3585113'
chicago: Lieutier, André, and Mathijs Wintraecken. “Hausdorff and Gromov-Hausdorff
Stable Subsets of the Medial Axis.” In Proceedings of the 55th Annual ACM Symposium
on Theory of Computing, 1768–76. Association for Computing Machinery, 2023.
https://doi.org/10.1145/3564246.3585113.
ieee: A. Lieutier and M. Wintraecken, “Hausdorff and Gromov-Hausdorff stable subsets
of the medial axis,” in Proceedings of the 55th Annual ACM Symposium on Theory
of Computing, Orlando, FL, United States, 2023, pp. 1768–1776.
ista: 'Lieutier A, Wintraecken M. 2023. Hausdorff and Gromov-Hausdorff stable subsets
of the medial axis. Proceedings of the 55th Annual ACM Symposium on Theory of
Computing. STOC: Symposium on Theory of Computing, 1768–1776.'
mla: Lieutier, André, and Mathijs Wintraecken. “Hausdorff and Gromov-Hausdorff Stable
Subsets of the Medial Axis.” Proceedings of the 55th Annual ACM Symposium on
Theory of Computing, Association for Computing Machinery, 2023, pp. 1768–76,
doi:10.1145/3564246.3585113.
short: A. Lieutier, M. Wintraecken, in:, Proceedings of the 55th Annual ACM Symposium
on Theory of Computing, Association for Computing Machinery, 2023, pp. 1768–1776.
conference:
end_date: 2023-06-23
location: Orlando, FL, United States
name: 'STOC: Symposium on Theory of Computing'
start_date: 2023-06-20
date_created: 2023-05-22T08:02:02Z
date_published: 2023-06-02T00:00:00Z
date_updated: 2023-05-22T08:15:19Z
day: '02'
department:
- _id: HeEd
doi: 10.1145/3564246.3585113
ec_funded: 1
external_id:
arxiv:
- '2303.04014'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2303.04014
month: '06'
oa: 1
oa_version: Preprint
page: 1768-1776
project:
- _id: 260C2330-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '754411'
name: ISTplus - Postdoctoral Fellowships
- _id: fc390959-9c52-11eb-aca3-afa58bd282b2
grant_number: M03073
name: Learning and triangulating manifolds via collapses
publication: Proceedings of the 55th Annual ACM Symposium on Theory of Computing
publication_identifier:
isbn:
- '9781450399135'
publication_status: published
publisher: Association for Computing Machinery
quality_controlled: '1'
status: public
title: Hausdorff and Gromov-Hausdorff stable subsets of the medial axis
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2023'
...
---
_id: '13053'
abstract:
- lang: eng
text: 'Deep neural networks (DNNs) often have to be compressed, via pruning and/or
quantization, before they can be deployed in practical settings. In this work
we propose a new compression-aware minimizer dubbed CrAM that modifies the optimization
step in a principled way, in order to produce models whose local loss behavior
is stable under compression operations such as pruning. Thus, dense models trained
via CrAM should be compressible post-training, in a single step, without significant
accuracy loss. Experimental results on standard benchmarks, such as residual networks
for ImageNet classification and BERT models for language modelling, show that
CrAM produces dense models that can be more accurate than the standard SGD/Adam-based
baselines, but which are stable under weight pruning: specifically, we can prune
models in one-shot to 70-80% sparsity with almost no accuracy loss, and to 90%
with reasonable (∼1%) accuracy loss, which is competitive with gradual compression
methods. Additionally, CrAM can produce sparse models which perform well for transfer
learning, and it also works for semi-structured 2:4 pruning patterns supported
by GPU hardware. The code for reproducing the results is available at this https
URL .'
acknowledged_ssus:
- _id: ScienComp
acknowledgement: "AP, EK, DA received funding from the European Research Council (ERC)
under the European\r\nUnion’s Horizon 2020 research and innovation programme (grant
agreement No 805223 ScaleML). AV acknowledges the support of the French Agence Nationale
de la Recherche (ANR), under grant ANR-21-CE48-0016 (project COMCOPT). We further
acknowledge the support from the Scientific Service Units (SSU) of ISTA through
resources provided by Scientific Computing (SciComp)-"
article_processing_charge: No
author:
- first_name: Elena-Alexandra
full_name: Peste, Elena-Alexandra
id: 32D78294-F248-11E8-B48F-1D18A9856A87
last_name: Peste
- first_name: Adrian
full_name: Vladu, Adrian
last_name: Vladu
- first_name: Eldar
full_name: Kurtic, Eldar
id: 47beb3a5-07b5-11eb-9b87-b108ec578218
last_name: Kurtic
- first_name: Christoph
full_name: Lampert, Christoph
id: 40C20FD2-F248-11E8-B48F-1D18A9856A87
last_name: Lampert
orcid: 0000-0001-8622-7887
- first_name: Dan-Adrian
full_name: Alistarh, Dan-Adrian
id: 4A899BFC-F248-11E8-B48F-1D18A9856A87
last_name: Alistarh
orcid: 0000-0003-3650-940X
citation:
ama: 'Peste E-A, Vladu A, Kurtic E, Lampert C, Alistarh D-A. CrAM: A Compression-Aware
Minimizer. In: 11th International Conference on Learning Representations .'
apa: 'Peste, E.-A., Vladu, A., Kurtic, E., Lampert, C., & Alistarh, D.-A. (n.d.).
CrAM: A Compression-Aware Minimizer. In 11th International Conference on Learning
Representations . Kigali, Rwanda .'
chicago: 'Peste, Elena-Alexandra, Adrian Vladu, Eldar Kurtic, Christoph Lampert,
and Dan-Adrian Alistarh. “CrAM: A Compression-Aware Minimizer.” In 11th International
Conference on Learning Representations , n.d.'
ieee: 'E.-A. Peste, A. Vladu, E. Kurtic, C. Lampert, and D.-A. Alistarh, “CrAM:
A Compression-Aware Minimizer,” in 11th International Conference on Learning
Representations , Kigali, Rwanda .'
ista: 'Peste E-A, Vladu A, Kurtic E, Lampert C, Alistarh D-A. CrAM: A Compression-Aware
Minimizer. 11th International Conference on Learning Representations . ICLR: International
Conference on Learning Representations.'
mla: 'Peste, Elena-Alexandra, et al. “CrAM: A Compression-Aware Minimizer.” 11th
International Conference on Learning Representations .'
short: E.-A. Peste, A. Vladu, E. Kurtic, C. Lampert, D.-A. Alistarh, in:, 11th International
Conference on Learning Representations , n.d.
conference:
end_date: 2023-05-05
location: 'Kigali, Rwanda '
name: 'ICLR: International Conference on Learning Representations'
start_date: 2023-05-01
date_created: 2023-05-23T11:36:18Z
date_published: 2023-05-01T00:00:00Z
date_updated: 2023-06-01T12:54:45Z
department:
- _id: GradSch
- _id: DaAl
- _id: ChLa
ec_funded: 1
external_id:
arxiv:
- '2207.14200'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://openreview.net/pdf?id=_eTZBs-yedr
month: '05'
oa: 1
oa_version: Preprint
project:
- _id: 268A44D6-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '805223'
name: Elastic Coordination for Scalable Machine Learning
publication: '11th International Conference on Learning Representations '
publication_status: accepted
quality_controlled: '1'
related_material:
record:
- id: '13074'
relation: dissertation_contains
status: public
status: public
title: 'CrAM: A Compression-Aware Minimizer'
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2023'
...