1,881 research outputs found
N′-[(E)-(5-Bromo-2-hydroxyphenyl)(phenyl)methylidene]-4-chlorobenzohydrazide
The Schiff base, C20H14BrClN2O2, displays a trans conformation with respect to the C=N double bond. The aromatic rings at either end of the –C(=O)–NH–N=C– fragment are nearly parallel [dihedral angle = 3.4 (5)°]. The hydroxy group forms an intramolecular hydrogen bond to the imino N atom
N′-[(E)-1-(5-Bromo-2-hydroxyphenyl)ethylidene]benzohydrazide
The C=N double bond in the title compound, C15H13BrN2O2, is trans
E configured and the dihedral angle between the aromatic ring planes is 22.3 (1)°. The crystal structure is stabilized by intramolecular O—H⋯O and intermolecular N—H⋯O hydrogen bonds
(5-Bromo-2-hydroxyphenyl)(phenyl)methanone
In the title compound, C13H9BrO2, the dihedral angle between the aromatic ring planes is 53.6 (1)°. The crystal structure is stabilized by intramolecular O—H⋯O and intermolecular C—H⋯O hydrogen bonding and C—H⋯π interactions
N′-[(E)-(5-Bromo-2-hydroxyphenyl)(phenyl)methylene]benzohydrazide
In the title compound, C20H15BrN2O2, the C=N double bond displays a trans configuration. The crystal structure features an intramolecular O—H⋯N hydrogen bond
(meso-5,7,7,12,14,14-Hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene)nickel(II) bis[O,O′-bis(4-methylphenyl) dithiophosphate]
In the title compound, [Ni(C16H32N4)](C14H14O2PS2)2 or [Ni(trans[14]dien)][S2P(OC6H4Me-4)2]2, where trans[14]dien is meso-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene, the NiII ion lies across a centre of inversion and is four-coordinated in a relatively undistorted square-planar arrangement by the four N atoms of the macrocyclic ligand trans[14]dien. The two O,O′-di(4-methylphenyl)dithiophosphates act as counter-ions to balance the charge. Important geometric data include Ni—N = 1.9135 (16) and 1.9364 (15) Å
{N′-[(E)-(5-Bromo-2-oxidophenyl)(phenyl)methylene]benzohydrazidato}pyridinenickel(II)
The asymmetric unit of title complex, [Ni(C20H13BrN2O2)(C5H5N)], contains two independent molecules. In each molecule, the central NiII atom has a square-planar environment, formed by the tridentate hydrazone and the monodentate pyridine ligands, with the N atoms in a trans arrangement about the NiII atom
{N′-[(E)-(5-Bromo-2-oxidophenyl)(phenyl)methylene]benzohydrazidato}pyridinecopper(II)
The asymmetric unit of title complex, [Cu(C20H13BrN2O2)(C5H5N)], contains two independent molecules. In each molecule, the central CuII atom has a square-planar environment formed by the tridentate hydrazone and the monodentate pyridine ligands, with the N atoms in a trans arrangement about the CuII atom
DiffNAS: Bootstrapping Diffusion Models by Prompting for Better Architectures
Diffusion models have recently exhibited remarkable performance on synthetic
data. After a diffusion path is selected, a base model, such as UNet, operates
as a denoising autoencoder, primarily predicting noises that need to be
eliminated step by step. Consequently, it is crucial to employ a model that
aligns with the expected budgets to facilitate superior synthetic performance.
In this paper, we meticulously analyze the diffusion model and engineer a base
model search approach, denoted "DiffNAS". Specifically, we leverage GPT-4 as a
supernet to expedite the search, supplemented with a search memory to enhance
the results. Moreover, we employ RFID as a proxy to promptly rank the
experimental outcomes produced by GPT-4. We also adopt a rapid-convergence
training strategy to boost search efficiency. Rigorous experimentation
corroborates that our algorithm can augment the search efficiency by 2 times
under GPT-based scenarios, while also attaining a performance of 2.82 with 0.37
improvement in FID on CIFAR10 relative to the benchmark IDDPM algorithm
{N′-[(E)-1-(5-Bromo-2-oxidophenyl)ethylidene]-4-chlorobenzohydrazidato}pyridinenickel(II)
The title complex, [Ni(C15H10BrClN2O2)(C5H5N)], displays a square-planar coordination geometry around the NiII ion, formed by the tridentate hydrazone and monodentate pyridine ligands, with the N atoms in a trans arrangement about the Ni center
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