STRUCTURE OF (R,S)-NARINGENIN

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Cholesteryl isobutylcarbonate

Cholesteryl isobutylcarbonate, C 32H 54O 3, contains two molecules (A and B) in the asymmetric unit. The isobutylcarbonate chain of molecule A and the isoprenoid tail of molecule B are each conformationally disordered over two positions. The two distinct molecules form separate stacks along the screw axes so that they are arranged in an antiparallel array, forming monolayers with a thickness of d 001 = 19.412 A. The central regions of the monolayers are characterized by efficient molecular packing and are separated by interface regions, which are more loosely packed.open4

Metal-organic framework with two different types of rigid triscarboxylates: Net topology and gas sorption behaviour

A 3-dimensional (3-D) anionic metal-organic framework (MOF), (NH 2(CH3)2)3[Zn6(BTC) 4(BTB)], of an unprecedented 3,3,3,5-c net topology was prepared via the solvothermal reaction of the Zn(ii) ion with two different types of rigid triscarboxylates, 1,3,5-benzenetricarboxylate (BTC3-) and 1,3,5-benzenetribenzoate (BTB3-), as 3-connected nodes, where a structurally rare Zn2(COO)5 cluster serves as a 5-connected secondary building unit. The MOF has a complicated 3-D channel micropore based on three different types of cage-like pores interconnected through the narrow necklike portals of a multiway channel. The MOF that had large solvent-filled pores showed gas sorption behaviour that well matched the pore dimensions and characteristics of the MOF.close1

Transmetalations in two metal-organic frameworks with different framework flexibilities: Kinetics and core-shell heterostructure

While only a partially transmetalated network was observed in a rigidmetal-organic framework (MOF), not only a completely transmetalated isostructural network but also a partially transmetalated core-shell heterostructural network could be obtained in a flexible MOF by controlling the reaction conditions.close191

A 3-dimensional coordination polymer with a rare lonsdaleite topology constructed from a tetrahedral ligand

A new 3D coordination polymer was solvothermally synthesized. The coordination polymer possesses a lon network built from 4-connecting Co-2 clusters and tetracarboxylate ligands, and exhibits selective gas sorption behavior as well as antiferromagnetic interactions.close131

A double-walled triangular metal-organic macrocycle based on a [Cu-2(COO)(4)] square paddle-wheel secondary building unit

A metal-organic macrocycle (MOM), [(Cu-2)(3)L-6(DMF)(2)(H2O)(4)], was prepared using a long and "pseudo-rigid" dicarboxylic acid, 1,4-bis(3-carboxylphenylethynyl) benzene (H2L), with some rotational flexibility, where the MOM has a double-walled triangular geometry with three Cu paddle-wheel secondary building units (SBUs) doubly connected by the ligands in a cis-conformation.close8

A supramoleculear self-assembled flexible open framework based on the coordination of honeycomb layers possessing octahedral and tetrahedral Co-II geometries

A flexible open framework, {[Co2(L)Cl(DMF)2(H 2O)]??Sx}n (H3L = 4,4???,4??????-[1,3,5-benzenetriyltris(carbonylimino)]-trisbenzoic acid, DMF = dimethylformamide), was constructed based on a honeycomb coordination subunit with both octahedral and tetrahedral CoII sites, showing moderate MeOH sorption and antiferromagnetic properties.close0

Conformational control of ligands to create a finite metal-organic cluster and an extended metal-organic framework

While a twofold interpenetrated 3-D metal-organic framework, [Cu-3(L-1)(2)(H2O)(3)]center dot 14DMF center dot 16H(2)O (1) (where, L-1 is 4,4',4 ''-[1,3,5-benzenetriyltris(carbonylimino)] trisbenzoate and DMF is N,N'-dimethylformamide), with a (3,4)-connected pto net topology was prepared using a tricarboxylic acid linked via secondary benzamide as an extended 3-connected node and a Cu paddle-wheel secondary building unit as a planar 4-connected node, another tricarboxylic acid with methylated tertiary benzamide linkage in a folded geometry completely converted its role from diverging to chelating ligand and resulted in a finite Ni-14 metal-organic cluster, [Ni-14(mu(3)-OH) (8)(L-2)(6)(formate)(2)(DMF)(10)(H2O)(2)]center dot 28DMF center dot 14H(2)O (2) (where L-2 is N,N',N ''-methyl-4,4',4 ''-[1,3,5-benzenetriyltris(carbonylimino)]trisbenzoate).close12

A two-fold interpenetrated (3,6)-connected metal-organic framework with rutile topology showing a large solvent cavity

A two-fold interpenetrated metal-organic framework (MOF), [(Zn(4)O)(2)L(4)(DMF)(2)(H(2)O)(3)], was prepared using the tritopic ligand 4,4',4 ''-[1,3,5-benzenetriyltris(carbonylimino)]trisbenzoic acid (H(3)L) and zinc nitrate. The MOF, based on the hexatopic tetranuclear Zn(4)O(COO)(6) secondary building unit, has a (3,6)-connected network with an rtl topology and a large solvent cavity.close302

A microporous metal-organic framework constructed from a 1D column made of linear trinuclear manganese secondary building units

A metal-organic framework (MOF) was prepared based on a 1D column made of a linear trinuclear manganese cluster as a secondary building unit (SBU), where the SBU is connected to two adjacent SBUs by carboxylates to form a 1D column and the column is further connected to four adjacent 1D columns via the SBUs to form a microporous MOF of pcu network topology.close7