Novel tandem Knoevenagel-Michael condensation product of naphtho[2,1-b]furan-2-carbaldehyde with dimedone: Synthesis, spectroscopic and crystal structure studies

2020 ◽  
Vol 28 ◽  
pp. 100458
Author(s):  
M. Shet Prakash ◽  
G. Smitha ◽  
T.M. Somanatha ◽  
P.A. Suchetan ◽  
G. Krishna Swamy ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Condensation Product ◽  
Michael Condensation

scholarly journals A Novel DR/NIR T-Shaped AIEgen: Synthesis and X-Ray Crystal Structure Study

Crystals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 269 ◽  
Author(s):  
Rosita Diana ◽  
Ugo Caruso ◽  
Luigi Di Costanzo ◽  
Gelsomina Bakayoko ◽  
Barbara Panunzi
Keyword(s):  
Crystal Structure ◽  
Near Infrared ◽  
Condensation Product ◽  
Infrared Emission ◽  
Structure Study ◽  
X Ray ◽  
Hydrogen Bond Interactions ◽  
Main Plane ◽  
Donor Acceptor ◽  
Intramolecular Hydrogen

We developed a new benzodifuran derivative as the condensation product between 2,6-diamino-4-(4-nitrophenyl)benzo[1,2-b:4,5-b’]difuran-3,7-dicarboxylate and 3-hydroxy-2-naphthaldehyde. The intramolecular hydrogen-bond interactions in the terminal half-salen moieties produce a sterically encumbered highly conjugated main plane and a D-A-D (donor-acceptor-donor) T-shaped structure. The novel AIEgen (aggregation-induced enhanced emission generator) fulfils the requirement of RIR (restriction of intramolecular rotation) molecules. DR/NIR (deep red/near infrared) emission was recorded in solution and in the solid state, with a noteworthy photoluminescence quantum yield recorded on the neat crystals which undergo some mechanochromism. The crystal structure study of the probe from data collected at a synchrotron X-ray source shows a main aromatic plane π-stacked in a columnar arrangement.

Structural studies of organoboron compounds. XXXVIII. 2,2-Diphenyl-4,4-tetramethylene-1,3,5-trioxa-3a-azonia-2-borata-2,3,4,5-tetrahydro-1H-cyclopenta[a]naphthalene

1990 ◽  
Vol 68 (1) ◽  
pp. 69-73 ◽  
Author(s):  
Wolfgang Kliegel ◽  
Mahmood Tajerbashi ◽  
Steven J. Rettig ◽  
James Trotter
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Good Yield ◽  
Chelate Ring ◽  
Condensation Product ◽  
Direct Methods ◽  
Organoboron Compound ◽  
Structural Studies ◽  
Weakly Bound ◽  
Full Matrix

Reaction of oxybis(diphenylborane) with the condensation product of salicylohydroxamic acid and cyclopentanone gives the title compound in good yield. Crystals of 2,2-diphenyl-4,4-tetramethylene-1,3,5-trioxa-3a-azonia-2-borata-2,3,4,5-tetrahydro-1H-cyclopenta[a]naphthalene are monoclinic, a = 12.521(1), b = 12.409(1), c = 12.975(1) Å, β = 93.784(8)°, Z = 4, space group P21/n. The structure was solved by direct methods and was refined by full-matrix least-squares procedures to R = 0.043 and Rw = 0.044 for 1502 reflections with I ≥ 2σ(I). The molecule has a typical diphenylboron hydroxamate structure featuring a five-membered COBON chelate ring. The O,O-chelating ligand is weakly bound to the diphenylboron moiety. Bond lengths (corrected for libration) include: (N)O—B = 1.558(4), (C=)O—B = 1.578(4), and C—B = 1.589(5) and 1.603(5) Å. Keywords: crystal structure, boron compound, organoboron compound.

Crystal structure of 2S,4S-2,4-carboxymethyl-1,3-dimethylthiazolidine hydrochloride

1993 ◽  
Vol 206 (2) ◽  
Author(s):  
Karl Peters ◽  
Eva-Maria Peters ◽  
Hans Georg von Schnering ◽  
Gerhard Bringmann ◽  
Christiana Hesselmann ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Condensation Product

AbstractThe title compound is the condensation product of the aminoacid

Synthesis and crystal structure of diaquabis(diketohydrindene-diketohydrindamine)manganese(II)

2003 ◽  
Vol 218 (1) ◽  
Author(s):  
M. G. Derebe ◽  
N. Retta ◽  
A. G. G. Moliterni ◽  
F. Capitelli
Keyword(s):  
Crystal Structure ◽  
Condensation Product ◽  
Synthesis And Crystal Structure ◽  
Ruhemann’S Purple

AbstractDiaquabis(diketohydrindene-diketohydrindamine)manganese(II), Mn(II) complex of Ruhemann's purple, a condensation product of ninhydrin and

Synthesis and Coordination Chemistry of Novel Binucleating Macrocyclic Ligands with Amine-thioether and Amine-thiophenolate Donor Functions

2001 ◽  
Vol 56 (9) ◽  
pp. 901-907 ◽  
Author(s):  
Marco H. Klingele ◽  
Gunther Steinfeld ◽  
Berthold Kersting
Keyword(s):  
Crystal Structure ◽  
Structure Determination ◽  
Reductive Amination ◽  
Condensation Product ◽  
Macrocyclic Ligands ◽  
Crystal Structure Determination ◽  
Deprotonated Form ◽  
X Ray ◽  
New Compounds

Abstract The ability of the aromatic tetraaldehyde l,2-bis(4-tert-butyl-2,6-diformylphenylsulfanyl)-ethane (1) to function as a precursor in the preparation of binucleating hexaamine-dithiolate ligands has been investigated. Reductive amination of compound 1 with bis(aminoethyl)amine under medium-dilution conditions affords the macrobicyclic hexaamine-dithioether compound L1. Deprotection of the [1+2] condensation product gives the corresponding 24-membered hexa-amine-dithiophenol ligand H2L2. The formulation of L1 as a macrobicyclic amine-thioether was confirmed by an X-ray crystal structure determination of the tetranuclear nickel(II) complex of L1, [{(L1)Ni2Cl2}2(μ-Cl)3](BPh4) (2b). The formulation of the doubly deprotonated form (L2)2- of H2L2 as a 24-membered amine-thiophenolate ligand was confirmed by an X-ray crystal structure determination of the dinuclear cobalt(III) complex, [(L2)CoIII(μ-OH)](ClO4)2 · Cl (3). The preparation and the crystal structures of the new compounds are described.

Synthesis and Structural Characterization of [Cu(NH2CH2C6H4N=CHC5H5N)Cl2]

2002 ◽  
Vol 57 (9) ◽  
pp. 999-1002 ◽  
Author(s):  
Amitabha Datta ◽  
Nirmal Kumar Karan ◽  
Samiran Mitra ◽  
Georgina Rosair
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bond ◽  
Chelate Ring ◽  
Condensation Product ◽  
Chair Conformation ◽  
Trigonal Bipyramidal ◽  
Amine Hydrogen ◽  
Tridentate Schiff Base ◽  
Copper Centre

The compound [Cu(NH2CH2C6H4N=CHC5H5N)Cl2] (1) containing the tridentate Schiff base ligand, which is the 1:1 condensation product of pyridine- 2-carboxaldehyde and 2-amino benzyl amine, was synthesised and its crystal structure has been determined. It is monomeric, space group P1, a = 7.704(1), b = 9.308(2), c = 11.228(2) A˚ , α= 68.97(2), β= 82.23(1), γ= 67.70(1)° and Z = 2. The crystal structure of 1 is based on a five coordinate copper centre with trigonal bipyramidal geometry. The six membered chelate ring possesses a half-chair conformation with C7 most out of the plane made by Cu1, N2, N3, C8 and C9. There is a hydrogen bond between Cl2 and an amine hydrogen H2A of a neighbouring molecule related by a centre of inversion

scholarly journals A Condensation Product from the Reaction of Ferrocene Carboxaldehyde with Excess Cyclohexanone. The Crystal Structure of 8-Ferrocenyl-2-hydroxytricyclo[7,3,1,0(2,7)]tridecan-13-one.

1988 ◽  
Vol 42a ◽  
pp. 454-459 ◽  
Author(s):  
Richard E. Bozak ◽  
Mahmud Hadi ◽  
Steinar Husebye ◽  
Knut Maartmann-Moe ◽  
Diane Shaieb ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Condensation Product

A 'Butterfly'-shaped Water Tetramer in a Cu4 Complex Supported by a Hydrazone Ligand: Synthesis, Crystal Structure, Magnetic Properties, and Quantum Chemical Study

2009 ◽  
Vol 62 (12) ◽  
pp. 1614 ◽  
Author(s):  
Sambuddha Banerjee ◽  
Soma Sen ◽  
Joy Chakraborty ◽  
Ray J. Butcher ◽  
Carlos J. Gómez García ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Quantum Chemical ◽  
Condensation Product ◽  
Variable Temperature ◽  
Quantum Chemical Study ◽  
Chemical Study ◽  
Coupling Constants ◽  
Spectroscopic Techniques ◽  
Hydrazone Ligand ◽  
X Ray

A potentially tetradentate NOOO donor hydrazone ligand, LH2 (condensation product of benzhydrazide with O-vanillin) generates a tetranuclear CuII complex [Cu4(L)4]·4H2O (1), whose void spaces are occupied by water tetramers presenting a ‘butterfly’ conformation with the highest dihedral angle reported to date, as revealed by its X-ray crystal structure. 1 has also been characterized using various spectroscopic techniques, including IR, UV-vis, and elemental analysis. Variable temperature magnetic susceptibility measurements reveal the presence of moderate antiferromagnetic intra-tetramer coupling between the four CuII centres connected through simple oxo groups of the hydrazone ligand with two different coupling constants (J1 = –61.7(3) cm–1 and J2 = –92(1) cm–1) corresponding to the two different CuII tetramers identified in the X-ray structure. We also report a quantum chemical study (MP2(full)/6–311+G(3df,2p)//B3LYP/6–311+G(3df,2p)) to calculate the stability of the water tetramers.

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