调控从非手性双钯(Ⅱ)和双铂(Ⅱ)配位组装中心同非手性蒽基吡唑配体组装的配位分子角的超分子手性构筑

胡佳华 邓威 蒋选丰 于澍燕＊,,2

调控从非手性双钯(Ⅱ)和双铂(Ⅱ)配位组装中心同非手性蒽基吡唑配体组装的配位分子角的超分子手性构筑

胡佳华1邓威1蒋选丰＊,2于澍燕＊,1,2

(1中国人民大学化学系，自组装化学实验室，北京100872)
(2北京工业大学环境与能源工程学院，绿色催化与分离北京市重点实验室，北京100124)

利用4-(4-(9-蒽基)苯基)-3，5-二甲基-吡唑配体(L)与不同的双金属组装单元合成了一类新颖的配位分子角[M2L2]([(bpy)Pd]2L2，1；[(dmbpy)Pd]2L2，2；[(phen)Pd]2L2，3；[(ppy)Pt]2L2，4，其中bpy=2，2′-联吡啶，dmbpy=4，4′-二甲基-2，2′-联吡啶，phen=1，10-菲咯啉，ppy=2-苯基吡啶)。结果表明这类配位分子角是通过金属-金属成键作用与吡唑基团自发去质子的协同作用自组装形成。利用单晶X-射线衍射，1H和13C NMR，ESI-MS和荧光光谱等测试手段对配合物1～3的结构进行了测定。同时，电中性的有机金属分子角[(ppy)Pt]2L2(4)的结构也通过1H和13C NMR，质谱和荧光光谱等手段进行了表征。运用不同的非手性双金属组装中心同非手性配体L，自组装得到的3个非手性配位分子角的晶体结构差别很大，特别是由[(phen)Pd]2组装中心形成的配位分子角3结晶得到了超分子手性构筑。

分子角；钯(Ⅱ)；铂(Ⅱ)；超分子手性；金属-金属成键

Supramolecular chemistry has attracted a significant research interest due to its rapid expansion to recognization and mimic of biological processes[1-7], molecular devices and machines,host-guest interactions,chemical sensors,dynamic covalent chemistry, catalysis[8],functional materials and medicinal chemistries[9].Coordination-driven self-assembly,as one ofthe highly efficient approach for the construction of molecular systems capable of well-defined molecularlevel motion,has been a field of growing interest,and a key issue in this field as regards the metal-based molecular corners,tweezers and clefts[10-11],which display fascinating properties and applications,such as catalysis,redox and photoluminescence,etc[12-15]. Therefore,considerable efforts have been devoted to the design and synthesis of functional molecular corners with two‘arms’or‘tips’for host-guest recognition[16-20],molecule separation and purification using various supramolecular interactions including hydrogen bonding,metal coordination,metal-metal bonding, hydrophobic forces,van der waals forces,electrostatic effects and/orπ-πinteractions[21-24].

Since 2001,we have developed a series ofmetallic corners complexes[25-27]by combining Pd(Ⅱ)and Pt(Ⅱ) centers with multi-pyrazole anion linkers[28]via metalmetal bonding interactions[29]directed synthesis and spontaneous deprotonation in aqueous solution[30].These results inspire us to further design new ligands to obtain structurally and functionally novel metalorganic corners[31-33]with promising applications.

Scheme 1 Synthesis of organometallic“molecular corners”with Pd(Ⅱ)

Scheme 2 Synthesis of organometallic“neutral molecular corners”with Pt(Ⅱ)

By employing a series of bis-Pd(Ⅱ)coordination motifs and anthracyl pyrazolate functional ligands,a new class of“metallic corners”with two rigid pyrazolate pincers in a syn conformation(as shown in Schemes 1 and 2)has been synthesized.NMR,ESIMS and Elemental analysis technology were used tocharacterize the structures of the ligand and[M2L2]“metallic corners”.Complexes 1·2PF6-(1=[(bpy)Pd]2L2), 2·2PF6-(2=[(dmbpy)Pd]2L2)and 3·2PF6-(3=[(phen)Pd]2L2)have also been determined by single-crystal X-ray diffraction structural analysis.Interestingly,the crystallography reveals that the achiral complex 3·2PF6-is self-assembled to a chiral three dimensional packing structure via intermolecularπ-πstacking and CH…πhydrogen bonds in the solid state.

1 Experimental

1.1 Materials and instruments

All chemicals and solvents were of reagent grade and were purified according to conventionalmethods[34]. The dimetal corners[(bpy)2Pd2(NO3)2](NO3)2,[(dmbpy)2Pd2(NO3)2](NO3)2,[(phen)2Pd2(NO3)2](NO3)2and[(ppy)2Pt2]Cl2were prepared according to literature procedures[35].

X-ray diffraction measurements were carried out at 291 K on a Bruker Smart Apex CCD area detector equipped with a graphite monochromated Mo Kα radiation(λ=0.071 073 nm).The absorption correction for all complexes was performed using SADABS.All the structureswere solved by directmethods and refined by employing full-matrix least-squares on F2using the SHELXTL(Bruker,2000)program and expanded using Fourier techniques[36-37].All non-H atoms of the complexes were refined with anisotropic thermalparameters. The hydrogen atoms were included in idealized positions.

Two visual molecular models were computed using CAChe program 6.1.1[38]to evaluate the shape of metallo-corners 4.

1.2 Synthesis and characterization of 1·2PF6-, 2·2PF6-,3·2PF6-and 4

1.2.1 Generalpyrazole ligand preparation

The pyrazole ligand,4-(4-(anthracen-9-yl)phenyl) -3,5-dimethyl-1H-pyrazole(L),was synthesized using a method similar to that employed for the other known ligands(referto supporting information forthe synthesis).1H NMR(400 MHz,DMSO-d6,25℃,TMS):δ=12.41 (s,1H,Pz-H),8.69(s,1H,anthryl-H),8.16(d,J=6.9 Hz,4H,anthryl-H),7.66(d,J=6.9 Hz,4H,anthryl-H), 7.55(t,J=5.6 Hz,4H,anthryl-H),7.46(s,4H,Ar-H), 2.51(s,3H,CH3-H),2.50(s,3H,CH3-H).

1.2.2 Synthesis of complex{[(bpy)Pd]2L2}(PF6)2(1·2PF6-)

[(bpy)2Pd2(NO3)2](NO3)2(9.5 mg,0.024 mmol)was added to a suspension of L(10 mg,0.029 mmol)in H2O and acetone(2 mL,1∶1,V/V),and the mixture was stirred for 24 h at85℃.The PF6-saltof 1·2NO3-was obtained by adding a 10-fold excess of KPF6to aqueous solution of 1·2NO3-at 60℃,which resulted in the immediate deposition of1·2PF6-asyellow crystals in quantitative yield.The crystals were filtered, washed with a minimum amount of cold water,and dried under vacuum.Yield:19.0 mg(97%).1H NMR( 400 MHz,CD3CN,25℃,TMS):δ=8.65(s,4H,bpy-H), 8.38(m,4H,bpy-H),8.29(s,2H,anthryl-H),8.17(d, J=8.4 Hz,8H,anthryl-H),7.72(m,4H,bpy-H),7.57 (m,8H,Ar-H),7.53(m,8H,anthryl-H),7.45(t,J=4.5 Hz,4H,bpy-H),2.17(s,12H,CH3-H);13C NMR(100 MHz,CD3CN,25℃,TMS):δ156.76,150.49,147.66, 142.26,136.74,131.63,130.00,120.04,117.34,13.02; ESI-MS(acetonitrile,m/z):610.1[1]2+;1 365.2[1·PF6]+; Elemental analyses Calcd.(%)for C70H54N8P2F12Pd2· 2H2O:C,54.38;H,3.78;N,7.25;Found:C,53.88; H,3.75;N,7.12.

1.2.3 Synthesis ofcomplex{[(dmbpy)Pd]2L2}(PF6)2(2·2PF6-)

(dmbpy)Pd(NO3)2(11.5 mg,0.024 mmol)was added to a suspension of L(10 mg,0.029 mmol)in H2O and acetone(2 mL,1∶1,V/V),and the mixture wasstirred for 24 h at 85℃.The PF6-salt of 2·2NO3-was obtained by adding a 10-fold excess of KPF6to aqueous solution of 2·2NO3-at 60℃,which resulted in the immediate deposition of2·2PF6-as yellow crystals in quantitative yield.The crystals were filtered,washed with a minimum amount of cold water,and dried under vacuum.Yield:18.7 mg(93%).1H NMR(400 MHz, CD3CN,25℃,TMS):δ=8.61(s,4H,dmbpy-H),8.22 (s,4H,dmbpy-H),8.12(m,2H,anthryl-H),7.73(d, J=12.8Hz,8H,anthryl-H),7.67(d,J=8.2 Hz,8H,Ar-H),7.53(d,J=8.8 Hz,8H,anthryl-H),7.44(t,J=4.5, 4H,dmbpy-H),2.17(s,24H,CH3-H);13C NMR(100 MHz,CD3CN,25℃,TMS):δ156.29,150.00,147.44,131.43,130.08,128.99,126.69,125.70,124.62, 117.32,20.76,13.01;ESI-MS(acetonitrile)m/z:638.15 [2]2+;1 421.25[2·PF6]+;Elementalanalyses Calcd.(%) for C74H62N8P2F12Pd2·2H2O:C,55.48;H,4.15;N,6.99; Found:C,55.47;H,4.18;N,6.98.

1.2.4 Synthesis of complex{[(Phen)Pd]2L2}(PF6)2(3·2PF6-)

(phen)Pd(NO3)2(11.7 mg,0.024 mmol)was added to a suspension of L(10 mg,0.029 mmol)in H2O and acetone(2 mL,1∶1,V/V),and the mixture was stirred for24 h at85℃.The PF6-saltof3·2NO3-was obtained by adding a 10-fold excess of KPF6to aqueous solution of 3·2NO3-at 60℃,resulting in the immediate deposition of 3·2PF6-as yellow crystals in quantitative yield.The crystals were filtered,washed with a minimum amount of cold water,and dried under vacuum.Yield:19.8 mg(91%).1H NMR(400 MHz, CD3CN,25℃,TMS):δ=8.88(d,J=8.4 Hz,4H,phen-H),8.66(s,2H,anthryl-H),8.64(d,J=5.3 Hz,4H, phen-H),8.20(d,J=8.4 Hz,8H,anthryl-H),8.04(m, 4H,phen-H),7.79(d,J=6.9 Hz,8H,Ar-H),7.58(m, 8H,anthryl-H),7.46(d,J=8.4 Hz,4H,anthryl-H),2.80 (s,12H,CH3-H);13C NMR(100 MHz,CD3CN,25℃, TMS):δ151.61,147.91,147.29,141.03,131.39,130.84, 130.07,129.10,128.46,128.11,127.01,126.69,126.38, 125.72,125.35;ESI-MS(acetonitrile)m/z:633.13[3]2+, 1 411.2[3·PF6]+;Elementalanalyses Calcd.(%)for C74H54N8P2F12Pd2·2H2O:C,55.76;H,3.67;N,7.03; Found:C,55.99;H,3.72;N,6.94.

1.2.5 Synthesis of complex[(ppy)Pt]2L2(4)

2-phenyl pyridine platinum chloride(124.3 mg, 0.18 mmol)was added to a suspension of L(189 mg, 0.54 mmol),Ag(CF3SO3)(46.508 mg,0.18 mmol), NaOMe(29.3 mg,0.54 mmol),CH3CN and CH3OH (20 mL,1∶1,V/V),and the mixture was stirred for 24 h at 60℃under N2.The product was collected by filtration,frozen overnight,recrystallization to obtain yellow-green product.Yield:71 mg(87%).1H NMR (400 MHz,CD3CN,25℃,TMS):δ=8.54(s,2H,ppy-H),8.33(t,J=4.0 Hz,2H,ppy-H),8.28(s,2H, anthryl-H),8.08(d,J=7.7 Hz,2H,ppy-H),7.80(t,J= 4.5 Hz,8H,anthryl-H),7.57(m,8H,Ar-H),7.50(d,J =7.8 Hz,2H,ppy-H),7.48(m,2H,ppy-H),7.43(d,J= 8.4Hz,8H,anthryl-H),7.40(t,J=4.5Hz,2H,ppy-H),7.28(s,2H,ppy-H),7.03(d,J=6.5 Hz,2H,ppy-H), 2.47(s,12H,CH3-H);13C NMR(100 MHz,CD3CN,25℃,TMS):δ142.26,136.74,132.57,131.62,130.08, 129.02,128.47,126.71,126.29,125.71,124.06,117.34, 25.06,13.02;MALDI-TOF(chloroform)m/z:814.3,1/2 [4+2K+];1 103.5,[4-L+Na++K+];Elemental analyses Calcd.(%)for C72H54N6Pt2:C,62.06;H,3.91;N,6.03; Found:C,62.54;H,4.02;N,5.98.

1.3 X-ray crystallography of complex 1·2PF6-, 2·2PF6-and 3·2PF6-

Final residuals along with unit cell,space group, data collection,and refinement parameters are presented in Table 1 and Table S1～S3.

CCDC:1041060,1·2PF6-;1032473,2·2PF6-; 1041062,3·2PF6-.

Table 1 Crystal structure determination data for complex 1·2PF6-,2·2PF6-and 3·2PF6-

Continued Table 1

2 Results and discussion

2.1 Synthesis of pyrazolate ligands

4-(4-(anthracen-9-yl)phenyl)-3,5-dimethyl-1H-pyrazole ligand(L)is a new compound and was synthesized using a method similar to that employed for the other known ligands[39-44].

2.2 Characterization of the[M2L2]2+-type corners

Complex 1·2PF6-,2·2PF6-and 3·2PF6-were fully characterized by elemental analysis,NMR spectroscopies,ESI-MS and X-ray crystal structure determination.The1H and13C NMR analysis of the product confirmed the formation ofa single highly symmetrical species,and integration of the signals indicated a 1∶1 ratio of dimetal motifs[(bpy)2Pd2(NO3-)2](NO3-)2to the pyrazolate anion L-in the corner 1·2PF6-(Fig.1). Remarkably,the signals corresponding to the coordinated bpy ligands present a singlet at 8.65,one set of triplets at 7.45 and two multiplets at 8.38,7.74 in the downfield region of the spectrum.The signals at 8.29,8.17,7.47 are attributed to protons of the anthryl-H and 7.57 is attributed to protons of the Ar-H from pyrazole ligand L.Notably,one singlet at 2.17,ascribed to the methyl protons of the pyrazole ligand L,is evident in the upfield region of the spectrum.The formation of 1 is further supported by ESI-MS in Fig.2 showing the mass to charge ratio(m/ z)peaks 610.1,1 365.0 for[1]2+,[1·PF6]+.The other two similar complexes 2·2PF6-and 3·2PF6-are also obtained and characterized by the same method(Fig. S8～S15).

Fig.11H NMR spectrum of 1·2PF6-(400 MHz,CD3CN, 25℃,TMS)

Fig.2 ESI-MS spectrum of 1·2PF6-in acetonitrile;the insetshows the isotopic distribution ofthe species [1]2+

The PF6-salts ofallthe compounds were obtained by adding 10-fold excess KPF6to its aqueous solution. By1H NMR analysis of 1·2PF6-,2·PF6-and 3·2PF6-, the positions,integral areas and shaping of the peaks are all understandable.We also have investigated the crystal structures of 1·2PF6-,2·2PF6-and 3·2PF6-, which are in consistent to our prospection.As to 4, the differentterminalligands(ppy)have been adapted to synthesis of neutral metallic molecular corner and we fails to obtain its crystalstructure.These structures are fully confirmed by1H NMR,13C NMR and MALDI -TOF(Fig.S13～S15).All the characterizations have demonstrated that the preparation of these molecular corners as mentioned is successful.The solid state structures ofthese“metallic corners”have been further confirmed by single crystal X-ray diffraction.

2.3 Crystalstructure of[Pd2L2]2+-type corners

The symmetric corner-like structure of complex 1 isstronglysupported by single-crystalstructure analysis. The structure of 1·2PF6-is shown in Fig.S16 and Fig. S17,complex 1·2PF6-crystallizes in the monoclinic space group P21/n.The crystallography of 1 reveals the Pd2dimetallic corner-shaped structure with one (μ-pyrazolato-N,N′)2doubly-bridged[(bpy)Pd]2dimetal motifs.In the dimetallic corner,two mono-pyrazole ligands L coordinated with two(bpy)Pd motifs and resulting in the formation of[Pd2L2]-Type corner.As shown in Fig.S16,two(bpy)Pd moieties are bridged by two pyrazolate ligands in an exodentate fashion.The Pd1…Pd2 separation of 0.315 27(9)nm,which is shorter than that observed in the previous dimetal corner-like complexes,is in the range of typical Pd…Pd interactions(0.26～0.33 nm).The central six membered ring consisting of the two Pd atoms and the four pyrazolyl N atoms has a boat-shaped conformation with Pd-Npzdistances between 0.199(6)and 0.202(3) nm and N-Pd-N anglesof77.40°between two pyrazolate groups.Two anthrylgroups located atopposed position (dihedral angle is 67.75°)with a distance of1.392 nm between adjacent central phenyl rings composing of C25-C33 and C13-C18 from two pyrazolate ligands, respectively.The dihedralangle between the two 2,2′-bipyridine terminalligands(N1-N2 and N3-N4)planes within the corner is 66.36°,which is smaller than the dihedral angle between the pyrazolate ligands. Furthermore,the Pd2dimetallic corner stacks into a one-dimensional chain via intermolecularπ…π packing interaction and weak C-H…πbonds between the aromatic groups of the helices along the crystallographic a axis in the solid state.It is interesting to find that these weak intermolecular interactions between the aromatic rings link dimetalcornertogether, featuring a three-dimensionalnetwork with 1D channels of 1.46 nm×1.48 nm(i.e.the distances between the palladium atoms of the adjacent dimetallic corner) containing the PF6-anions and solvents.

Complex 2·PF6-crystallizes in the triclinic space group P1.In the dimetallic corner,two monopyrazolate ligands L coordinated with two(dmbpy)Pd motifs and resulting the formation of[Pd2L2]-type corner.In the asymmetric unit,two molecules of dimetallic assembles as monomer are hold together closely by multiple intermolecular C-H…πbonds and formed a“tennis balls”dimer(Fig.S18 and Fig.S19). As shown in Fig.S19,two(dmbpy)Pd motifs are bridged by two pyrazolate ligands in an opening-book fashion and the separation of Pd1…Pd2 is 0.323 2 nm.The pyrazolyl N atoms has a boat-shaped conformation with Pd-Npzdistances between 0.199 2 and 0.202 nm and N-Pd-N angles of 85.42°between two pyrazolate groups.Two anthryl groups locate at opposed position(dihedral angle is 83.78°,the center distance is 1.253 nm).The dihedral angle between two adjacent central phenyl rings from two pyrazolate ligands is 69.32°and between the two 4,4′-dimethyl-2,2′-bipyridine terminal ligands(N1-N2 and N3-N4) planes is 77.58°.Furthermore,one PF6-anion in the crystal locate in the[(dmbpy)Pd]2dimetal corner and adjacent to the dmbpy ligands by hydrogen bonds of C-H…F.Interestingly,the dimetal corner could pack into three-dimensional tubular channel with the wall containing the bridged linkers and the dmbpy aromatic rings,which extend in the crystallographic a, b,and c axes with PF6-anions frozen inside.

After replacing dimetallic clips[(bpy)2Pd2(NO3)2] (NO3)2with[(phen)2Pd2(NO3)2](NO3)2,an extremelysimilar assembly is afforded.As shown in Fig.3 and Fig.4,the crystal structure of 3·2PF6-also displays a [Pd2L2]metal-organic corner structure,and the selected bond lengths and angles are depicted.Complex 3· 2PF6-crystallizes in the monoclinic space group C2. Like with 1·2PF6-and 2·2PF6-,the crystallography of 3·2PF6-reveals the Pd2dimetallic corner-shaped structure with one(μ-pyrazolato-N,N′)2doubly-bridged [(phen)Pd]2dimetal motifs.In the dimetallic corner, two mono-pyrazole ligands L coordinate with two (phen)Pd motifs resulting in[Pd2L2]-type molecular cornerformation.Pd-Npzdistances are between 0.188(8) and 0.207(5)nm and N-Pd-N angles of87.57°between two pyrazolate groups.The Pd1…Pd2 separation is 0.306(7)nm.Two anthryl groups locate at opposed position with a dihedral angle of 45.54°.The dihedral angle between two adjacent central phenyl-ring planes from two pyrazolate ligands is 56.70°,and two 1,10-phenanthroline terminal ligands(N1-N2 and N3-N4) planes within the corner is 62.49°.Because of the weak intermolecularπ…πpacking interaction and C-H…πbonds between the aromatic groups of the helices along the crystallographic a axis in the solid state,the Pd2dimetallic corner stacks into a onedimensional chiral chain(Fig.4).The chirality of the crystals of 3·2PF6-is further confirmed by solid state CD spectroscopy(Fig.S21).

Fig.3 Coordination mode and corners structure of 3·2PF6-drawn in the ball and stick mode from side view; All solvents and counter anions are omitted for clarity

Fig.4 One-dimensional chiral crystallization structure of 3·2PF6-drawn in the spacefilling(A)and simplified packing mode(B)

2.4 Spectroscopic properties

The electronic absorption spectra of 1·2PF6-,2· 2PF6-and 3·2PF6-(Fig.5)in acetonitrile(4 in chloroform as shown in Fig.S22)at 298 K exhibitan intense high-energy absorption band at 350～400 nm(blue line,)with an emission shoulder at 400～450 nm(red line).As shown in Fig.5,12PF6-exhibits characteristic anthracene emission and fluorescence maxima at 396, 419 and 437 nm and UV-Vis spectral peaks at 353, 368 and 389 nm in acetonitrile,respectively.

The effects of anions on the fluorescent emission intensity of metallo-corner have been confirmed as shown in Fig.6[45].The addition ofaliquots of NO3-to a solution of3·2PF6-in H2O/CH3CN(1∶10,V/V,1.0×10-5mol·L-1)results in a linear increase of the fluorescence intensity until it reaches 1 equiv.concentration (1.0×10-5mol·L-1)(Fig.7).These results preliminary reflect the complexing affinity between 3·2PF6-and anions due to the C-H…O hydrogen bonds and electrostatic attraction.However,we failed to obtain the similar change of fluorescence intensity when the addition of NO3-was applied to 1·2PF6-and 2·2PF6-, which might be attributed to the weaker C-H…O hydrogen bonds and electrostatic attractions between the anion and host.

Fig.5 UV-Vis absorption spectrum(the blue line)and the fluorescence emission spectrum(the red line) of 1·2PF6-(λex=368 nm)

Fig.6 Fluorescence emission spectra of 1·2PF6-,2·2PF6-and 3·2PF6-

Fig.7 Emission spectral changes of 3·2PF6-(1×10-5mol· L-1)upon addition of different amount of CNO-3(black,the fluorescent spectra of 3·2PF6;inset, the plot of the change in CNO-,at peak of 403 nm,3λex=380 nm);(a)0,(b)0.2,(c)0.4,(d)0.6,(e)0.8, (f)1.0,(g)1.2,(h)1.4,(i)1.6,(j)1.8,(k)2.0 and (l)2.2 equiv

3 Conclusions

A novel luminescent anthraquinone pyrazole ligand was employed to assemble with Pd(Ⅱ)or Pt(Ⅱ) centers via a directed synthesis process that occurs along with spontaneous deprotonation of the ligands and generates four clip-shaped metallo-corners(M2L2) in nearly quantitative yield.These fluorescent assemblies have been characterized by elemental analysis,1H and13C NMR,ESI-MS and in the cases of 1·2PF6-,2·2PF6-and 3·2PF6-by single crystal X-ray diffraction analysis.Most interestingly,achiral dimetal molecular corner 3·2PF6-self-assembles to a chiral 3D packing structure via weak intermolecular interactions in the solid state.

Supporting information is available athttp://www.wjhxxb.cn

Acknowledgments:This project was supported by the National Natural Science Foundation of China(No.91127039, 21471011),The Importation and Development of High-Caliber Talents Project of Beijing Municipal Institution,and Beijing Synchrotron Radiation Facility(BSRF)for the crystal structure determination using synchrotron radiation X-ray diffraction analysis.

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Tuning Supramolecular Chiral Architecture of Molecular Corners from Achiral Dipalladium(Ⅱ)and Diplatinum(Ⅱ)Complexes with Achiral Anthracyl Pyrazole Ligand

HU Jia-Hua1DENG Wei1JIANG Xuan-Feng＊,2YU Shu-Yan＊,1,2
(1Laboratory for Self-Assembly Chemistry,Department of Chemistry,Renmin University of China,Beijing 100872)
(2Beijing Key Laboratory for Green Catalysis and Separation,Department of Chemistry and Chemical Industry,
College of Environmental and Energy Engineering,Beijing University of Technology,Beijing 100124)

Anovelkind ofcoordination molecularcorners[M2L2]([1=(bpy)Pd]2L2,2=[(dmbpy)Pd]2L2,3=[(phen)Pd]2L2, 4=[(ppy)Pt]2L2,where bpy=2,2′-bipyridine,dmbpy=4,4′-dimethyl-2,2′-bipyridine,phen=1,10-phenanthroline,ppy= 2-phenylpyridine)was synthesized through synergistic metal-metal bonding interaction and spontaneous deprotonation from the pyrazole linkers 4-(4-(anthracen-9-yl)phenyl)-3,5-dimethyl-1H-pyrazole(L).Three complexes 1～3 were characterized by single crystal X-ray diffraction,1H and13C NMR,ESI-MS and fluorescence spectroscopy.The neutralorganometallic corner[(ppy)Pt]2L24 was also determined by1H and13C NMR,MALDITOF-MS and fluorescence spectroscopy.These achiralmolecular corners assemble from differentachiraldimetallic centers with the achiral ligand HL in quite different crystal structures,in particular,3 with a[(phen)Pd]2assembling center crystallizes into a supramolecular chiral architecture.CCDC:1041060,1;1032473,2; 1041062,3.

molecular corners;palladium(Ⅱ);platinum(Ⅱ);supramolecular chirality;metal-metal bonding interaction

O0614.82+3；O0614.82+6

A

1001-4861(2015)07-1278-09

10.11862/CJIC.2015.185

2015-03-31。收修改稿日期：2015-05-31。

国家自然科学基金(No.91127039，21471011)资助项目。

＊通讯联系人。E-mail：yusy@ruc.edu.cn