A series of Pd complexes the 1,2,3-triazole based abnormal NHC ligands type (a-NHC)PdI₂(L) [L = NC₅H₅and PPh₃] successfully catalyzed fluoride-free Hiyama coupling in air.

Well-defined palladium N-heterocyclic carbene (NHC) complexes were employed in the one-pot tandem Heck alkynylation/cyclization sequence for preparing biologically relevant benzofuran compounds under copper-free conditions a time-efficient step-reduced fashion. In particular, series of binuclear complexes, 1b–1e and 2b–2e, alkyl-bridged NHC ligands, namely, {1,1′-di-R1-4,4′-R2-di-1,2,4-triazoline-5,5′-diylid-2-ene] (R1 = i-Pr; R2 −(CH2)2–, −(CH2)3−), their mononuclear analogues,...

The syntheses of a new Schiff base, diethyl-5-(2-hydroxybenzylidene)aminoisophthalate (HL), and copper complex, [Cu(L2)] (1), imparting L–, have been described. Both the ligand HL complex 1 thoroughly characterized by elemental analyses, electrospray ionization mass spectrometry, FT-IR, NMR (1H 13C), electronic absorption, emission spectral studies their structures determined X-ray single-crystal analyses. Distinctive chemodosimetric behavior toward Hg2+ has established UV/vis, emission,...

Double-4-ring (D4R) zinc phosphate [Zn(dipp)(DMSO)]4 (1, dipp = 2,6-di-iso-propylphenylphosphate, DMSO dimethyl sulfoxide), on treatment with a free fluoride ion source, exhibited ability to sense and capture ions from variety of sources, as evidenced by extensive solution 31P 19F NMR spectral titration studies. The ion-encapsulated cage [nBu4N][F@{Zn(dipp)(DMSO)}4] (2) was isolated in good yield an equimolar reaction between 1 nBu4NF methanol characterized analytical spectroscopic methods....

A facile synthetic strategy for the generation of a new class inorganic–organic–inorganic hybrids is reported. Replacement labile DMSO ligands from preformed Double-Four-Ring (D4R) zinc phosphate cluster [Zn(dipp){(CH3)2SO}]4 by addition 4-aminopyridine (4-ampyr) results in isolation another discrete D4R [Zn(dipp)(4-ampyr)]4 (1), which forms hydrogen-bonded framework solid-state. If 1-methyl-4,4′-bipyridinium salts are employed instead, tetra-cationic [Zn(dipp)(L)]4[PF6]4 (2) and...

Stepwise hierarchical and rational synthesis of porous zinc phosphate frameworks by predictable directed assembly easily isolable tetrameric [Zn(dipp)(solv)]4 (dippH2 = diisopropylphenyldihydrogen phosphate; solv CH3OH or dimethyl sulfoxide) with D4R (double-4-ring) topology has been achieved. The preformed highly robust secondary building unit can be coordinatively interconnected through a varied choice bipyridine-based ditopic spacers L1-L7 to isolate eight functional frameworks,...

Abstract A series of nickel‐based chiral bifunctional catalysts ( 1d – 3d ) with N‐heterocyclic carbene (NHC) ligands derived from (1 R )‐(–)‐menthol, S )‐(–)pinene, and )‐(+)‐camphor have been successfully designed for asymmetric Michael addition reactions under base‐free conditions. The NHC complexes, namely, [1‐R‐3‐{ N ‐(phenylacetamido)}imidazol‐2‐ylidene] 2 Ni [R = )‐menthyl ), )‐pinane 2d )‐isobornyl )], bearing ancillaries on the amido‐functionalized side arms ligands, performed...

The double-eight-ring (D8R), an elusive secondary building unit of zeolites, has been stabilized for the first time, both in solution and solid-state. present study further establishes that any three double-ring blocks viz. D4R, D6R D8R ([ArPO3Zn(L)]n (n = 4, 6 or 8)), can be preferentially isolated (over other two) through a careful choice metal source, aryl phosphate ancillary ligand, apart from maintaining meticulous control on reaction conditions.

Four new alkaline-earth metal-based metal–organic frameworks, [Mg4(TCMTB)2(OAc)2(DMA)2(H2O)3]n (Mg-TCMTB), {[Ca4(TCMTB)2(OH)(DMF)2(H2O)5]·Cl}n (Ca-TCMTB), [Sr4(TCMTB)2(OH)(OAc)(DMA)6(H2O)]n (Sr-TCMTB) and [Ba9(TCMTB)4(NO3)6(DMA)14]n (Ba-TCMTB) (H3TCMTB = 2,4,6-tris[(4′-carboxyphenoxy)methyl]-1,3,5-trimethylbenzene), have been synthesized structurally characterized. Structural analysis of the MOFs reveals presence diverse structures topologies in these systems due to conformational...

Bridgeless double metallocalix[4]arenes possessing two orthogonally arranged dinuclear cavitands were obtained from a Re2(CO)10, rigid bis-chelating OO donor (H2-L), and flexible bis-ditopic NN (L') by one-pot approach.

Double-4-ring zinc phosphate (D4R), [Zn(dipp)(4-Py-CHO)]4 (2) (dipp=diiminopyridine), bearing four formyl groups, has been utilized as a building block (SBU) for the synthesis of new class imine-linked [4+2] COF-like polycrystalline frameworks. Reactions 2 with series linear aromatic diamines results in formation frameworks [Zn4 (dipp)4 (L)2 ]n (3-6) (L=L1 to L4 , diimines formed by condensation 4-pyridine carboxaldehyde diamines). Employing an alternative synthetic strategy, through...

Three related aromatic [22] heteroporphyrins have been synthesized and characterized, with the target of achieving NIR absorption. The propensity these smallest π-conjugated macrocycles to absorb in region is benefitted from fusion/annelation precursor heterocycles.

Whereas 2,6-diisopropyl- and 2,6-dimethylphenyl-phosphate forms a 1-D chain, 2,6-diisopropyl-4-amino-phenylphosphate crystallizes as two different 3-D supramolecular aggregates. The first pseudopolymorph 1a is porous framework built around rare water-dimer template that undergoes single-crystal to transformations yield desolvated form 1b. second-pseudopolymorph 1c, obtained by re-crystallisation of in methanol, dense framework.

Abstract Reaction of Zn(OAc) 2 ⋅ H O with 2,6‐diisopropylphenyl phosphate (dippH ) in the presence pyridine‐4‐carboxaldehyde (Py‐4‐CHO) methanol resulted isolation a tetrameric zinc cluster [Zn(dipp)(Py‐4‐CH(OH)(OMe))] 4 MeOH ( 1 four hemiacetal moieties stabilized on double‐4‐ring inorganic cubane cluster. The change solvent from to acetonitrile leads formation [Zn(dipp)(Py‐4‐CHO)] ), which coordinated Py‐4‐CHO retains its aldehydic form. Dissolution CD 3 CN readily converts it form and...

2,6-Diisopropyl-4-nitrophenylphosphate (A), synthesized in two steps from 2,6-diisopropyl-4-nitrophenol, serves as a convenient starting point to prepare several N-functionalized monoaryl phosphates via 2,6-diisopropyl-4-aminophenylphosphate (adippH2) (1), which quite interestingly exhibits five different pseudo-polymorphic structures 1a–1e. Several of these polymorphic forms are inter-convertible one another through single crystal (SC–SC) transformation, aided by evacuation and solvent...

[Ti(acac)2(OiPr)2] reacts with tert-butylphosphonic acid to yield a series of titanium organophosphonates such as tetranuclear [Ti4(acac)4(μ-O)2(μ-tBuPO3)2(μ-tBuPO3H)4]·2CH3CN (1), pentanuclear [Ti5(acac)5(μ-O)2(OiPr)(μ-tBuPO3)4(μ-tBuPO3H)2] (2), hexanuclear [Ti6(acac)6(μ-O)2(OiPr)2(μ-tBuPO3)6] (3), or [Ti6(acac)6(μ-O)3(OiPr)(μ-tBuPO3)5(μ-tBuPO3H)]·2CH3CN (4). The isolation each these products in pure form depends on the molar ratio reactants solvent medium. Among these, 3 is obtained only...

Uncoordinated N-donors spacers in the title compounds facilitate interesting orthogonal H-bonding, leading to formation of 3-D polymeric networks.

A simple protocol for multi-gram synthesis of unstable and normally inaccessible phosphate monoesters ROPO₃H₂ is reported, apart from demonstration their thermal instability utility as starting materials metal single source precursors.

Abstract A Schiff base oxido vanadium complex derived from glycine and salicylaldehyde with phenanthroline as co-ligand viz . [VO(salgly)(phen)].4H 2 O ( 1 ) (where salgly = glycine, phen 1,10-phenanthroline) was synthesized under ambient conditions. The characterized by elemental analysis spectroscopic techniques such FT-IR, UV-vis electron paramagnetic resonance (EPR). structure of the determined single crystal X-ray diffraction. asymmetric unit consists two crystallographically unique...

Abstract The reaction of Zn(OAc) 2 · 2H O with tert ‐butyl phosphonic acid ( t BuPO 3 H ) yields the zinc phosphonate [Zn( )(H O)] 1 ). X‐ray diffraction studies reveals that compound has a novel layered structural arrangement central atoms in tetrahedral coordination environment. This observation emphasizes crucial role played by organic substituents on chemistry transition metal ions.

We report solvent-dependent excited state properties of three difuranone derivatives with a quinoidal backbone by steady-state and lifetime fluorescence measurements theoretical calculations. Remarkable bathochromic shifts in diminished intensity indicate the occurrence strong intramolecular charge-transfer transitions high polar solvents. Cyclic voltammetric redox potentials reveal an interesting variation biradical characters compounds increasing solvent polarity. Solvent polarity also...