Abstract A self-assembled coordination cage usually possesses one well-defined three-dimensional (3D) cavity whereas infinite number of 3D-cavities are crafted in a designer metal-organic framework. Construction discrete possessing multiple is challenging task. Here we report the peripheral decoration trinuclear [Pd 3 L 6 ] core with one, two and three units 2 4 entity for preparation multi-3D-cavity conjoined-cages (L ) b ], 5 c formulations, respectively. Formation tetranuclear...

Abstract Controlling supramolecular systems between different functional forms by utilizing acids/bases as stimuli is a formidable challenge, especially where labile coordination bonds are involved. A pair of acid/base responsive, interconvertible 1,5‐enedione/pyrylium based Pd 2 L 4 ‐type cages prepared that exhibit differential guest binding abilities towards disulfonates varied sizes. three‐state switch has been achieved, (i) weakly coordinating base induced cage‐to‐cage transformation in...

A set of Pd2L4, Pd3L4, and Pd4L4-type single-, double-, triple-cavity cages are prepared by complexation Pd(NO3)2 with designer bis-monodentate (L1), tris-monodentate (L2), tetrakis-monodentate (L3) ligands. The Pd2L4 cage exists in equilibrium a Pd3L6 cage; the shifted to at 70 °C or upon addition pyrazine-N,N'-dioxide (PZDO). binds PZDO molecule using electrostatic, bifurcated H-bonding overcoordinated interactions. discrete Pd3L4 Pd4L4 compounds conjoined comprising unequal sized (bigger...

A pyridine/aniline appended unsymmetrical bidentate ligand N-(4-(4-aminobenzyl)phenyl)nicotinamide, investigated in this work has two well-separated coordination sites. Combination of the with cis-protected palladium(II) (i.e., PdL′) and separate reactions produced corresponding Pd2L′2Lun2 extremely rare Pd2Lun4 type self-assembled binuclear complexes, respectively. Notably, both varieties complexes are prepared from a common system. Two diastereomers (2,0) (1,1)-forms) possible for complex,...

Abstract Equilibrium measurements of surface tension have been carried out on nematic compounds using the pendant drop method. A liquid crystal is suspended at tip a capillary tube inside completely enclosed thermostatic chamber filled with an inert gas and maintained in equilibrium its saturated vapour throughout experiment. The tensiontemperature characteristic for all studied show anomalous behaviour. slope phase initially negative but changes sign near nematic-isotropic transition...

Abstract In continuation of our previously reported experimental studies on the surface tension liquid crystals, measurements have been carried out p-cyanobenzylidene p'-n-octyloxyaniline (CBOOA) in its smectic A, nematic and isotropic phases. The tension-temperature (γ-T) characteristic shows a positive slope throughout phase, changes sign at A-nematic transition, remains negative over entire range again reverses immediately after nematic-isotropic now continuing for few degrees phase....

Abstract Complexation of 1,4‐phenylenebis(methylene) diisonicotinate, L1 , with cis ‐protected Pd II components, [Pd( L′ )(NO 3 ) 2 ], in an equimolar ratio yielded binuclear complexes, 1 a – d [Pd ( ](NO 4 formulation where stands for ethylenediamine (en), tetramethylethylenediamine (tmeda), 2,2′‐bipyridine (bpy), and phenanthroline (phen). The combination 4,4′‐bipyridine, L2 the units is known to yield molecular squares, . However, b coexist corresponding triangles, Combination equivalent...

Selective binding of chloride over the other most abundant anions in living organisms is pivotal due to its essential role physiological functions. Herein, we report a template-free Pd2 L4 cage exhibiting high selectivity for medium-sized halides (i. e., Cl- , Br- ) water owing size-discriminatory nature cavity. In pure water, this displays and micromolar affinity chloride. The shows no towards biologically more such as phosphates, carboxylates, or bicarbonate. This an unprecedented...

Concentration-dependent equilibria of molecular squares [Pd4(L′)4(L)4](NO3)8 and triangles [Pd3(L′)3(L)3](NO3)6 were obtained when cis-protected Pd(II) units [PdL′(NO3)2] (L′ = tmeda, 2,2′-bpy, phen) combined independently with 4,4′-bipyridine (L) in water. However, complexation [PdL′(OTs)2] L resulted exclusive formation the corresponding squares. The addition AgOTs to each mixture square triangle led a shift equilibrium, resulting disappearance crystal structures [Pd4(L′)4(L)4](OTs)8...

Multi-cavity discrete coordination cages (MCDCC) are prepared by mixing Pd( ii ) with designer bis- and tris-monodentate ligands in a 5 : 4 ratio. Two trinuclear sub-frameworks conjoined the molecular architecture of ensuing MCDCC.

A series of isomeric triaryl compounds with a modular positioning the halogen and NO2 groups have been synthesized by azide–alkyne "click reaction" characterized single crystal X-ray structure analysis. This has provided an opportunity for understanding efficiency bifurcated halogen⋯NO2 synthon in organization molecules crystalline lattice. The changes molecular conformation, packing supramolecular aggregation due to change relative complementary groups, atom group on ring C respectively,...

The shape and molecular packing of <italic>cis</italic>-protected Pd(<sc>ii</sc>) based binuclear complexes depends upon the ligand <italic>cis</italic>-protecting agents.

Investigation of the intermolecular acyl-transfer reactivity in molecular crystals myo-inositol orthoester derivatives and its correlation with crystal structures enabled us to identify essential parameters support efficient reactions crystals: 1) favorable geometry nucleophile (-OH) electrophile (C-O) 2) assembly, reinforced by C-H⋅⋅⋅π interactions, which supports a domino-type reaction crystals. These were used another reactive through data-mining study Cambridge Structural Database. A 2:1...

Complexation of Pd(II) with a designer unsymmetrical bis-monodentate ligand (2 : 4 ratio) yielded specific Pd

Racemic 2,6-di-O-benzoyl-myo-inositol 1,3,5-orthobenzoate (rac-3), which usually crystallizes in a monoclinic lattice (Form I, P21/c) from common organic solvents, when crystallized 2-propanol yielded concomitantly, thin whisker like crystals II, triclinic, P) with inclusion of and water molecules, along the Form I crystals. Thin fibre-like were also obtained on crystallization toluene, toluene crystal III). The II III could be converted into thermally via melt crystallization. exhibit...

Isomeric para- (1) and meta- (2) ditoluate derivatives of naphthalene 2,3-diol exhibited polymorphism producing three (Forms 1I, 1II, 1III) two 2I, 2II) polymorphs each, respectively, depending on the solvent conditions crystallization. Crystal forms 2I could be obtained repeatedly, whereas crystal 1III 2II were (separately) in one crystallization experiments, each. All stable at ambient conditions, except for Form 2II, which disintegrated to a powder over 4–5 days. In contrast,...

The crystal structure of racemic 2,6-di-O-benzoyl-myo-inositol 1,3,5-orthoformate (1) which underwent a facile intermolecular benzoyl transfer reaction in the solid state, revealed helical assembly molecules along two-fold screw axis via O–H⋯O hydrogen bond bringing electrophile (CO) and nucleophile (–OH) close proximity axis. However, structurally related 2,6-di-O-(p-halobenzoyl)-myo-inositol 1,3,5-orthoformates (bromo (2) chloro (3)) produced triclinic dimorphs (both P) when crystallized...

The title compound, C(17)H(16)O(8), yields conformational dimorphs [forms (I) and (II)] at room temperature, separately or concomitantly, depending on the solvent of crystallization. yield crystals form is always much more than that (II). molecule has one donor -OH group can make intermolecular O-H...O hydrogen bonds with two acceptor C=O groups, as well hydroxyl O atom; interestingly, each options utilized in dimorphs. crystal structure contains asymmetric unit organized a planar sheet...

A new Pd6L′6L3-type water-soluble prismatic nanocage has been exclusively prepared by combining cis-Pd(tmeda)(NO3)2 with the tetra-pyridyl ligand 1,3,6,8-tetra(pyridyn-3-yl)pyrene in 6:3 ratio absence of any externally added template. The characterized NMR spectroscopy, ESI-MS, and single-crystal XRD techniques. confined nanospace cage utilized to encapsulate nonpolar/polar/anionic-aromatic guest molecules water. shows size selectivity toward aromatic (as studied for nonpolar guests) having...