3,4-Dimethyl-N-[(E)-3-nitro­benzyl­idene]-1,2-oxazol-5-amine

In the title compound, C12H11N3O3, the dihedral angle between the 3-nitro­benzaldehyde and 5-amino-3,4-dimethyl-1,2-oxazole moieties is 2.46 (12)°. The mol­ecule is close to planar, the r.m.s. deviation for the non-H atoms being 0.028 Å. The packing only features van der Waals inter­actions between the mol­ecules

(2E)-3-[4-(Dimethyl­amino)­phen­yl]-1-(2,5-dimethyl-3-thien­yl)prop-2-en-1-one

The asymmetric unit of the title compound, C17H19NOS, contains two independent mol­ecules which differ in the dihedral angles between the five- and six-membered rings [12.52 (10) and 4.63 (11)°]. Weak inter­molecular C—H⋯O hydrogen bonds link the two independent mol­ecules into pseudocentrosymmetric dimers. In one mol­ecule, the O atom of the carbonyl group is disordered over two positions in a 0.699 (4):0.301 (4) ratio

N-[(E)-1,3-Benzodioxol-5-yl­methyl­idene]-3,4-dimethyl-1,2-oxazol-5-amine

In the title compound, C13H12N2O3, the dihedral angle between the aromatic rings is 7.94 (12)°. In the crystal, inversion dimers linked by pairs of C—H⋯O hydrogen bonds generate R 2 2(6) loops. Weak π–π [centroid–centroid separations = 3.7480 (13) and 3.9047 (13) Å] and C—H⋯π inter­actions help to consolidate the packing

(E)-2-Methyl-6-[(1-phenyl-1H-pyrazol-4-yl)methyl­idene]cyclo­hexa­none

The asymmetric unit of the title compound, C17H18N2O, contains two independent mol­ecules. In both, the cyclo­hexane ring adopts a flattened chair conformation, and the 3- and 4-methyl­ene C atoms as well as the methyl C atoms are disordered over two positions, the occupancy of the major component being 68 (1)% in one mol­ecule and 64 (1)% in the other. The phenyl and pyrazole rings in both mol­ecules are approximately coplanar, the r.m.s. deviations being 0.048 and 0.015 Å, respectively. Weak inter­molecular C—H⋯O hydrogen bonding is present in the crystal structure

6-Amino-5-(1-amino-2,2-dicyano­vin­yl)-3,3a,4,5-tetra­hydro-2H-indene-4-spiro-1′-cyclo­pentane-3a,7-dicarbonitrile–thio­phene-2-carbaldehyde (1/0.5)

In each of the two independent indene-4-spiro­pentane mol­ecules in the asymmetric unit of the title 2:1 adduct, C19H18N6·0.5C5H4OS, the cyclo­hexene ring adopts a half-chair conformation and the cyclo­pentene and cyclo­pentane rings adopt envelope conformations. The mean plane through the cyclo­hexene/cyclo­pentene fused system is aligned at a dihedral angle of 77.9 (1)° with respect to the mean plane through the cyclo­pentane ring in one mol­ecule and 87.0 (1)° in the other. In the crystal, adjacent indene-4-spiro­pentane mol­ecules are linked by N—H⋯N hydrogen bonds into a three-dimensional network. The spaces within the network are occupied by the thio­phene-2-carbaldehyde mol­ecules. The thio­phene-2-carbaldehyde unit is disordered over two positions of equal occupancy. The crystal studied was found to be a non-morohedral twin with two minor twin components of 18.4 and 9.7%

2,4,5-Trimeth­oxy­benzaldehyde monohydrate

In the title compound, C10H12O4·H2O, the 2,4,5-trimeth­oxy­benzaldehyde mol­ecule is almost planar (rms deviation = 0.0183 Å). There is an R 1 2(5) ring motif due to O—H⋯O hydrogen bonding. In the crystal, the mol­ecules are stabilized in the form of one-dimensional polymeric chains extending along [010] due to O—H⋯O hydrogen bonding with adjacent water mol­ecules. The H atoms involved in inter­molecular hydrogen bonding are disordered over two sets of sites of equal occupancy

Metal Organic Frameworks as Versatile Hosts of Au Nanoparticles in Heterogeneous Catalysis

[EN] The present review describes the state of the art of the use of metal organic framework (MOF)-encapsulated Au nanoparticles (NPs) as heterogeneous catalysts. The purpose is to show that catalysts with very good performance, frequently among the most active Au catalysts reported so far, can be obtained by incorporation of Au NPs inside MOFs. The available data indicate that the high catalytic activity of MOF-encapsulated Au NPs derives from (i) small particle size, (ii) high dispersion and homogeneous distribution inside MOFs crystals, (iii) stabilization of particle size by confinement of Au NPs inside MOFs cages, and (iv) the synergy that can arise by the combination of the activity of Au NPs and MOFs. After some introductory sections presenting general issues commenting about the relevance of Au catalysis, how to determine the internal versus external location of Au NPs, and evidence in support for catalyst stability, this mini review covers reactions using Au@MOFs as catalysts for oxidations, reductions, tandem processes, and photocatalysis with the emphasis in providing a comparison with the performance of other alternative Au-containing catalysts. In the final section, we summarize in our view the current achievements and which are the next targets in this area.A.D.M. thanks University Grants Commission, New Delhi for the award of Assistant Professorship under its Faculty Recharge Programme. A.D.M. also thanks Department of Science and Technology, India, for the financial support through Fast Track project (SB/FT/CS-166/2013) and the Generalidad Valenciana for financial aid supporting his stay at Valencia through the Prometeo programme. Financial support by the Spanish Ministry of Economy and Competitiveness (CTQ-2015-69153-CO2-R1 and Severo Ochoa) and Generalidad Valenciana (Prometeo 2013-014) is gratefully acknowledged.Dhakshinamoorthy, A.; Asiri, AM.; García Gómez, H. (2017). Metal Organic Frameworks as Versatile Hosts of Au Nanoparticles in Heterogeneous Catalysis. ACS Catalysis. 7(4):2896-2919. https://doi.org/10.1021/acscatal.6b03386S289629197

2-[(4-Chloro­benzyl­idene)amino]-4,5,6,7-tetra­hydro-1-benzothio­phene-3-carbonitrile

In the title compound, C16H13ClN2S, the dihedral angle between the 4-chloro­benzaldehyde moiety and the heterocyclic five-membered ring is 7.21 (17)°. In the crystal, mol­ecules are linked by weak C—H⋯π inter­actions, generating [100] chains

2-[(2-Chloro­benzyl­idene)amino]-4,5,6,7-tetra­hydro-1-benzothio­phene-3-carbonitrile

In the title compound, C16H13ClN2S, the mean planes fitted through all non-H atoms of the heterocyclic five-membered and the benzene rings are oriented at a dihedral angle of 5.19 (7)°. In the crystal, a weak C—H⋯π inter­action occurs, along with weak π–π inter­actions [cenroid–centroid distance = 3.7698 (11) Å]

4-[(Anthracen-9-yl­methyl­idene)amino]-1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one

In the title compound, C26H21N3O, the phenyl ring of the 4-amino­anti­pyrine group and the heterocyclic five-membered ring along with its substituents, except for the N-bound methyl group (r.m.s. deviation = 0.0027 Å), form a dihedral angle of 54.20 (5)°. Two S(6) ring motifs are formed due to intra­molecular C—H⋯N and C—H⋯O hydrogen bonds. In the crystal, mol­ecules are linked into supra­molecular chains along the a-axis direction via C—H⋯O contacts