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1.
To further explore the coordination possibilities of the flexible tripodal ligand, 4,4′,4′′‐(benzene‐1,3,5‐triyl‐tris(oxy))tribenzoic acid (H3BTTB), two solvent‐controlled three‐dimensional (3D) manganese(II) coordination polymers, [Mn3(BTTB)2(H2O)4](H2O)2 ( 1 ) and [Mn3(BTTB)2(DMF)2](DMF)2 ( 2 ), were synthesized and characterized. Single crystal X‐ray diffraction analysis indicates that in the MnII complexes the BTTB ligands exhibit two coordination modes, which have not been reported previously. Complexes 1 and 2 involve different one‐dimensional (1D) rod‐shaped metal–carboxylate secondary building units (SBUs). The 1D SBUs are further extended to afford two different three‐dimensional (3D) frameworks with similar flu topology via linkage of the BTTB ligands. The results demonstrate that the reaction solvent as well as conformation and coordination mode of BTTB ligands play key roles on the formation of the final framework structures. Additionally, their luminescent properties were investigated.  相似文献   

2.
Four metal‐organic frameworks (MOFs), {[Mn3.5L(OH)(HCOO)4(DMF)] · H2O} ( 1 ), {[In2.5L2O(OH)1.5(H2O)2] · DMF · CH3CN · 2H2O} ( 2 ), {[Pb4L3O(DMA)] · CH3CN} ( 3 ), and {[LaL(NO3)(DMF)2] · 2H2O} ( 4 ) were synthesized by utilizing the ligand 2,2′,6,6′‐tetramethoxy‐4,4′‐biphenyldicarboxylic acid (H2L) via solvothermal methods. All MOFs were characterized by single‐crystal X‐ray diffraction, powder X‐ray diffraction, thermogravimetric analysis, and infrared spectroscopy. In 1 , the Mn2+ ions are interconnected by formic groups in situ produced via DMF decomposition to form a rare 2D macrocyclic plane, which is further linked by L2– to construct the final 3D network. In 2 , 1D zip‐like infinite chain is formed and then interconnected to build the 3D framework. In 3 , a [Pb64‐O)2(O2C)10(DMA)2] cluster with a centrosymmetric [Pb64‐O)2]8+ octahedral core is formed in the 3D structure. In 4 , the La3+ ions are connected with each other through carboxylate groups of L2– to generate 1D zigzag chain, which is further linked by L2– to construct a 3D network with sra topology. Solid photoluminescence properties of 3 and 4 were also investigated.  相似文献   

3.
Two new PbII metal‐organic coordination polymers [Pb(3‐pdip)(glu)] · H2O ( 1 ) and [Pb(3‐pdip)2(odc)] · 2H2O ( 2 ) [3‐pdip = 2‐(3‐pyridine)imidazo[4,5‐f]1,10‐ phenanthroline, H2glu = glutaric acid, H2odc = octanedioic acid], were synthesized by hydrothermal reactions of varying fatty acid ligands, and structurally characterized by single‐crystal X‐ray diffraction. Complex 1 exhibits a one dimensional (1D) chain structure, in which 3‐pdip ligands are attached to one side of the 1D chain. Complex 2 exhibits also a 1D chain structure, in which some paired 3‐pdip ligands are affiliated on both sides of the 1D chain. In the title complexes, the π–π stacking and hydrogen‐bonding interactions extend the 1D chain into a 3D supramolecular framework, respectively. The structural differences between the title complexes indicate the importance of fatty acid length for the creation of molecular architectures. Moreover, the thermal and fluorescence properties of title complexes are also reported.  相似文献   

4.
To explore the coordination possibilities of anthracene‐based ligands, three cadmium(ιι) complexes with anthracene‐9‐carboxylate ( L ) and relevant auxiliary chelating or bridging ligands were synthesized and characterized: Cd2( L )4(2bpy)2(μ‐H2O) ( 1 ), Cd2( L )4(phen)2(μ‐H2O) ( 2 ), and {[Cd3( L )6(4bpy)]} ( 3 ) (2bpy = 2,2′‐bipyridine, phen = 1,10‐phenanthroline, and 4bpy = 4,4′‐bipyridine). Structural analyses show that complexes 1 and 2 both take dinuclear structures by incorporating the chelating 2bpy or phen ligand, which are further interlinked by intermolecular hydrogen‐bonding, π ··· π stacking, and/or C–H ··· π supramolecular interactions to generate higher‐dimensional supramolecular frameworks. Complex 3 has a one‐dimensional (1D) ribbon‐like structure, which is further assembled into a two‐dimensional (2D) layer, and a three‐dimensional (3D) framework by the co‐effects of interchain C–H ··· O hydrogen‐bonding and C–H ··· π supramolecular interactions. Moreover, the luminescent properties of these complexes were further investigated in detail.  相似文献   

5.
An effective method was developed for the synthesis of three cluster‐based frameworks with multifarious secondary building units (SBUs) and various structures, which were formulated as [Me2NH2]2[Zn10(BTC)63‐O)(μ4‐O)(H2O)5] · 3DMA · 9H2O ( FJI ‐ 3 ), [Me2NH2]2[Zn93‐OH)2(BTC)6(H2O)3] · 5DMA · 6H2O ( FJI ‐ 4 ) and [Me2NH2][Zn33‐OH)(BTC)2DMF] · H2O ( FJI ‐ 5 ) (H3BTC = 1,3,5‐benzenetricarboxylic acid, DMA = N,N′‐dimethyl acetamide and DMF = N,N′‐dimethyl formamide), respectively. X‐ray structural analysis reveals that FJI ‐ 3 displays 3D highly porous metal‐organic framework with four kinds of microporous cages constructed by two paddle‐wheel Zn2(CO2)4, trimeric Zn3O(CO2)6, and tetrameric Zn4O(CO2)6 SBUs. FJI ‐ 4 exhibits 3D microporous MOFs with a dodecahedral cavities built by paddle‐wheel Zn2(CO2)4 and trimeric Zn3O(CO2)6. FJI ‐ 5 shows 3D microporous MOFs with an 1D channel assembled by the Zn3O(CO2)6 SBUs. In addition, the fluorescence and sorption properties in these cluster‐based frameworks were also investigated. Furthermore, the method employed in this work may provide an useful approach to the design and synthesis of novel cluster‐based frameworks.  相似文献   

6.
Two new co‐crystals based on 1,2,4,5‐benzenetetracarboxylic acid, (H2BETC)(H4tpim)](NO3) ( 1 ) and [(H4BETC)0.5(H2BETC)0.5(HVB4)](H2O) ( 2 ) [H4BETC = 1,2,4,5‐benzenetetracarboxylic acid, Htpim = 2,4,5‐tri(4‐pyridyl)‐imidazole, and VB4 = adenine], were synthesized and characterized by elemental analyses, IR spectroscopy, single‐crystal X‐ray diffraction, and X‐ray powder diffraction analysis. Compounds 1 and 2 were further assembled to form 3D supramolecular frameworks with 1D channels by intermolecular C–H ··· O, O–H ··· O, and N–H ··· O hydrogen‐bonding interactions. The results reveal that the structural differences of 1 and 2 may be attributed to different molecular components. Moreover, the UV/Vis and luminescent spectra of ligands and corresponding compounds were briefly investigated.  相似文献   

7.
The reaction of Pb(CH3COO)2·3H2O with N‐benzesulfonyl‐L‐glutamic acid in the presence of 2, 2′‐bipyridine (bipy) or 1,10‐phenanthroline (phen) produced two novel complexes [Pb2(Bs‐glu)2(bipy)2] ( 1 ) and [Pb2(Bs‐glu)2(phen)2] ( 2 ) (Bs‐glu = N‐benzesulfonyl‐L‐glutamic acid dianion). In 1 chains bearing alternative 16‐membered rings and Pb2O3 nodes are constructed from the interactions of PbII ions with the carboxylates of Bs‐glu ligands. To the best of our knowledge, this is the first lead(II) complex of carboxylates with the formation of chains of Pb2O3. In 2 the 16‐membered ring units are connected by centrosymmetric Pb2O2 nodes to form chains. Complexes 1 and 2 construct the 3‐D supramolecular architectures through versatile hydrogen bonds and π‐π stacking interactions.  相似文献   

8.
A new coordination polymer (CP), namely, poly[[diaquatris[μ2‐1,4‐bis(1H‐imidazol‐1‐yl)benzene]bis[μ6‐4‐(2,4‐dicarboxylatophenoxy)phthalato]tetracobalt(II)] hexahydrate], {[Co4(C16H6O9)2(C12H10N4)3(H2O)2]·6H2O}n, has been synthesized by solvothermal reaction. The CP was fully characterized by IR spectroscopy, elemental analysis, thermogravimetric analysis, and powder and single‐crystal X‐ray diffraction. It presents a three‐dimensional (3D) structure based on tetranuclear CoII secondary building units (SBUs) with a tfz‐d net and point symbol (43)2(46·618·84). The 4‐(2,4‐dicarboxyphenoxy)phthalic acid (H4dcppa) ligands are completely deprotonated and link {Co4(COO)4}4? SBUs into two‐dimensional (2D) layers. Furthermore, adjacent layers are connected by 1,4‐bis(1H‐imidazol‐1‐yl)benzene (bib) ligands, giving rise to a 3D supramolecular architecture. Interestingly, there are numerous elliptical cavities in the CP where isolated unique discrete hexameric water clusters have been observed. The results of thermogravimetric and magnetic analyses are described in detail.  相似文献   

9.
A new two‐dimensional metal‐organic coordination polymer [Cd2(2,3,2′,3′‐sdpa)(H2O)3] · 2H2O ( 1 ) were hydro(solvo)thermally synthesized by the reaction of 2,3,2′,3′‐sulfonyldiphthalic acid (2,3,2′,3′‐H4sdpa) with Cd(NO3)2 · 4H2O and characterized by elemental analysis, thermogravimetry, IR and luminescence spectroscopy, and X‐ray diffraction. In complex 1 , two kinds of cadmium atoms are linked together by anionic sdpa4– ligands to form a 2D metal‐organic network. The adjacent 2D layers further interact with each other through hydrogen bonds and π ··· π interactions to form a 3D supramolecular structure. The luminescence spectra and thermal properties of 1 were also investigated.  相似文献   

10.
The microporous metal‐organic framework Cd2(ABTC)(H2O)(DMA)2 · H2O · 3DMA ( 1 ) (H4ABTC = 3, 3′,5, 5′‐azobenzenetetracarboxylic acid; DMA = N,N′‐dimethylacetamide) was prepared by solvothermal reaction and characterized. X‐ray structure analysis revealed that compound 1 is a three‐dimensional (3D) open framework with 2D channels. The topology is based on a PtS net, constructed of 4‐connected rectangular ABTC4– units with 4‐connected tetrahedral dinuclear Cd2(CO2)4(H2O)(DMA)2 secondary building units (SBUs). The solid‐state excitation‐emission spectra showed that the strongest emission peak is at 403 nm upon excitation at λ = 287 nm.  相似文献   

11.
Two manganese(II) coordination polymers, namely, [Mn1.5(BCB)(bpy)1.5(H2O)]n ( 1 ), and [Mn(HBCB)(bibp)2(H2O)] ( 2 ), were assembled from the mixed ligands of the flexible tripodal ligand of 3,5‐bis(2‐carboxylphenoxy)benzoic acid (H3BCB) and two rigid N‐donors [bpy = 4,4′‐bipyridine, and bibp = 4,4′‐bis(imidazolyl)biphenyl]. Their structures were determined by single‐crystal X‐ray diffraction analyses and further characterized by elemental analyses (EA), IR spectra, powder X‐ray diffraction (PXRD), and thermogravimetric (TG) analyses. Structural analysis reveals that complex 1 is a 3D (3,4,6)‐connected {5 · 62}2{56 · 64 · 7 · 82 · 92}{64 · 8 · 9} net based on two kinds of inorganic nodes of dinuclear {Mn2(COO)2} SBUs and Mn(2) ions. Complex 2 is a hydrogen bonds based 3D supramolecule with 6‐connected {412 · 63}‐ pcu net. Besides, the variable‐temperature susceptibilities of 1 and 2 were investigated.  相似文献   

12.
Three coordination compounds with dimensions from 0D to 2D, namely, [Co(bppdca)2(HL1)2] ( 1 ) [Co(bppdca)(L2)(H2O)] · 2H2O ( 2 ) and [Co(bppdca)(L3)] · 3H2O ( 3 ) [bppdca = N,N′‐bis(pyridine‐3‐yl)pyridine‐2,6‐dicarboxamide, H2L1 = 2,5‐pyridinedicarboxylic acid, H2L2 = 4,4′‐oxybisbenzoic acid, H2L3 = 2‐carboxymethylsulfanyl nicotinic acid] were hydrothermally synthesized and structurally characterized. Single crystal X‐ray diffraction analysis reveals that complex 1 is a discrete 0D complex, in which the bppdca ligand and the H2L1 act as the terminal groups to coordinate with the CoII ions. In coordination polymer 2 , two bppdca ligands coordinate in anti configuration with two CoII ions to generate a 28‐membered Co2(bppdca)2 loop, which is further extended into 1D ladder‐like double chain by pairs of L2 ligands. In 3 , the CoII ions are linked by bppdca ligands to generate 1D wave‐like chain, which is further connected by the L3 to form a 2D network. Finally, the coordination compounds 1 – 3 are extended into 3D supramolecular frameworks through the hydrogen bonding interactions. The CoII ions and the bppdca ligands in the title coordination compounds exhibit different coordination characters and conformations. The effect of organic dicarboxylates with different rigidity and length on the structures of CoII coordination compounds was investigated. In addition, the fluorescence and electrochemical behaviors of coordination compounds 1 – 3 were reported.  相似文献   

13.
A coordination polymer based on Preyssler-type phosphotungstate, {Cu4(L)2(HL)(H2O)5[HNa(H2O)P5W30O110]}·2H2L·4H2O (1), has been hydrothermally synthesized and characterized by single crystal X-ray diffraction, powder X-ray diffraction, IR spectrum, element analysis, and thermogravimetric analysis. The structure shows that the asymmetry coordination of the N-donor ligands results in formation of chiral sub-building blocks (SBUs). The chiral SBUs were connected by Cu–O bonds and organic ligands to form a two-dimensional (2-D) structure. Furthermore, 1 represents the first 2D + 2D → 2D polypseudorotaxane framework based on the chiral lamellar structure; magnetic properties have been investigated as well.  相似文献   

14.
Four new metal‐organic frameworks [Cu2(2,2′‐bipy)2(ox)(H2O)2]·(H2bptc) ( 1 ), [Cu(bptc)0.5(phen)(H2O)]·H2O ( 2 ), Co2(bptc)(bmb)1.5 ( 3 ) and [Cd2(bptc) (bmb)]·3H2O ( 4 ) (H4bptc = 3,3′,4,4′‐biphenyltetracarboxylic acid, ox = oxalate, phen = 1,10‐phenanthroline, 2,2′‐bipy = 2,2′‐bipyridine and bmb = 4,4′‐bis((1H‐imidazol‐1‐yl)methyl)biphenyl), were obtained by reactions of the corresponding metal salts with H4bptc and N‐containing auxiliary ligands and their structures were determined by single‐crystal X‐ray diffraction. The results reveal that 1 has a 0‐D structure consisting of discrete ionic entities, while 2 features a 1‐D ladder structure. Additionally, there exist π‐π stacking and intermolecular hydrogen‐bonding interactions in 1 and 2 , respectively, forming 3‐D supramolecular structures. In 3 ‐ 4 , undulating 2‐D metal‐bptc layer structures are formed with two different coordination modes of bptc carboxylate groups, respectively, which are further extended by bmb into 3‐D structures. Magnetic properties of 1 and 3 have been studied. The photoluminescence property of 4 has also been investigated. Moreover, nonlinear optical measurements showed that 4 displayed a second‐harmonic‐generation (SHG) response of 0.7 times of that for urea.  相似文献   

15.
A novel cobalt–carboxylate framework constructed from secondary building units (SBUs), {[Co16(btca)8(H2O)40]·16H2O}n (1) (H4btca = 1,2,3,4-butanetetracarboxylic acid) has been hydrothermally synthesized and characterized by techniques of single-crystal X-ray diffraction analyses, elemental analyses, infrared spectra, powder X-ray diffraction and thermogravimetric analyses. The complex exhibits 2D 4-connected sql net with (44 × 62) topology symbol built from [Co2(COO)4(H2O)5] SBUs and is further extended into a 3D supramolecular architecture via strong O–H···O hydrogen bonds. Moreover, the magnetic measurements indicate complex 1 exhibit antiferromagnetic behavior.  相似文献   

16.
A novel three‐dimensional (3D) lanthanide‐organic framework [Pr3(NTP)3(H2O)6] · 10H2O ( 1 ), (H3NTP = 3,3′,3′‐nitrilotripropionic acid) was synthesized and characterized by elemental analyses, IR spectroscopy, and X‐ray diffraction analyses. The results show that complex 1 is connected through NTP ligands to form a 3D network with microchannels. The coordination mode of the NTP ligand was found for the first time. In order to investigate the temperature effects on controlling the dimensionality of the complexes, another two complexes, namely, [Nd(NTP)(H2O)2] · H2O · HBr ( 2 ) and [Pr(H2O)][+NH3(CH2CH2COO)][OOCCOO]1.5 ( 3 ) were synthesized and characterized. Notably, in complex 3 , the NTP ligand lost its two arms because of the high temperature. Furthermore, the thermogravimetric analyses of the three complexes are discussed in detail.  相似文献   

17.
Four metal‐organic coordination polymers [Co2(L)3(nipa)2]·6H2O ( 1 ), [Cd(L)(nipa)]·3H2O ( 2 ), [Co(L) (Hoxba)2] ( 3 ) and [Ni2(L)2(oxba)2(H2O)]·1.5L·3H2O ( 4 ) were synthesized by reactions of the corresponding metal(II) salts with the rigid ligand 1,4‐bis(1H‐imidazol‐4‐yl)benzene (L) and different derivatives of 5‐nitroisophthalic acid (H2nipa) and 4,4′‐oxybis(benzoic acid) (H2oxba), respectively. The structures of the complexes were characterized by elemental analysis, FT‐IR spectroscopy and single‐crystal X‐ray diffraction. Complexes 1 and 3 have the same one‐dimensional (1D) chain while 2 is a 6‐connected twofold interpenetrating three‐dimensional (3D) network with α ‐Po 412·63 topology based on the binuclear CdII subunits. Compound 4 features a puckered two‐dimensional (2D) (4,4) network, and the large voids of the packing 2D nets have accommodated the uncoordinated L guest molecules. An abundant of N–H···O, O–H···O and C–H···O hydrogen bonding interactions exist in complexes 1–4 , which contributes to stabilize the crystal structure and extend the low‐dimensional entities into high‐dimensional frameworks. Lastly, the photoluminiscent properties of compounds 2 were also investigated.  相似文献   

18.
The reaction of CdCl2 · 2.5H2O with 1,1′‐bis(3‐carboxybenzyl)‐4,4′‐bipyridinium dichloride (H2L1 · Cl2) or 4,4′‐bis[(3‐carboxypyridino)methyl]‐biphenyl dichloride (H2L2 · Cl2) in a dimethylformamide/methanol mixed‐solvent system at room temperature, affording the complexes [(CdCl2)3(L1)3]n ( 1 ) and {[CdCl2(L2)(H2O)2] · 2H2O}n ( 2 ). They were characterized by elemental analyses, IR spectroscopy, and single‐crystal X‐ray diffraction. Both 1 and 2 exhibit 1D coordination networks, which further stack into a 3D supramolecular structure by hydrogen bonding and π–π interactions. Furthermore, these two complexes exhibit different photochromic behavior in the solid state, which may originate from different charge‐distributions of H2L1 · Cl2 and H2L2 · Cl2 ligands.  相似文献   

19.
Hydrothermal reactions of Cd(OAc)2 · 2H2O with 1,2‐naphthalic anhydride in the absence/presence of different rigid/flexible bis(pyridyl) co‐ligands, produce three distinct coordination polymers, namely [Cd(ndc)]n ( 1 ), {[Cd5(ndc)4(bpp)2(OH)2](H2O)4}n ( 2 ), and [Cd5(ndc)4(bpy)2(OH)2]n ( 3 ) [ndc = 1,2‐naphthalenedicarboxylate, bpp = 1,3‐bis(4‐pyridyl)propane, and bpy = 4,4′‐bipyridine]. Complex 1 contains dinuclear [Cd2O2] clusters as secondary building units (SBUs) and shows a two‐dimensional (2D) kgd network. Complexes 2 and 3 possess one‐dimensional (1D) chains based on pentanuclear [Cd53‐OH)2(COO)2] units as SBUs, which are further extended to afford 2D sql sheet via flexible bpp in 2 and three‐dimensional (3D) pcu network via rigid bpy in 3 , respectively. The structural diversities indicate that the bis(pyridyl) co‐ligands with different flexibility play a key role on the formation of the final supramolecular structures. The complexes were characterized by X‐ray crystallographic, IR, elemental, thermal stability, and powder X‐ray diffraction analyses. In addition, the photoluminescent properties in solid state were also investigated.  相似文献   

20.
Two novel interdigitated metal‐quinolone complexes, namely [Cu2(cfH)2(bptc)(H2O)] · 4H2O ( 1 ) and [Zn2(levofH)2(odpa)] · 5.5H2O ( 2 ) (bptc = 3,3′,4,4′‐benzophenonetetracarboxylate, cfH = ciprofloxacin, odpa = 4,4′‐oxydiphthalate, levofH = levofloxacin) were synthesized hydrothermally and characterized by elemental analyses, IR spectra, UV/Vis spectra, TG analyses, powder X‐ray diffraction, and single‐crystal X‐ray diffraction. Moreover, solid‐state photoluminescence property of compound 2 was also investigated at room temperature. Compound 1 exhibits a novel interdigitated architecture, which is built from 1D chains with side arms. The structure of compound 2 consists of 1D chains with dangling levofloxacin ligands protruding from both sides of the chain, and these chains are interdigitated with each other to generate a interdigitated framework.  相似文献   

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