殷文濤,謝曉丹,劉湘粵,蔡鎮(zhèn)鋒,吳展鵬,韓 松,周家容,倪春林
(華南農(nóng)業(yè)大學(xué) 理學(xué)院-生物材料研究所,廣東 廣州510642)
四氯合鈷-芐基-2-硝基吡啶季銨鹽的合成及其晶體結(jié)構(gòu)
殷文濤,謝曉丹,劉湘粵,蔡鎮(zhèn)鋒,吳展鵬,韓 松,周家容,倪春林*
(華南農(nóng)業(yè)大學(xué) 理學(xué)院-生物材料研究所,廣東 廣州510642)
合成了1種含四氯合鈷配陰離子的芐基取代吡啶季銨鹽[BzNO2Py]2[CoCl4][(BzNO2Py)+為芐基-2-硝基吡啶鎓離子];利用元素分析儀、紅外光譜儀和X射線衍射儀表征了其組成和結(jié)構(gòu).結(jié)果表明,標(biāo)題化合物為單斜晶系,空間群P21/c,晶胞參數(shù)為a=0.779 3(1)nm,b=1.849 3(2)nm,c=1.881 4(2)nm,β=97.56(1)°,V =2.688 0(5)nm3,Z =4,Dc=1.560g/cm3,GOOF=1.036,R1=0.055 9,wR2=0.151 5.標(biāo)題化合物分子由1個(gè)四面體形的 [CoCl4]2-陰離子和2個(gè)[BzNO2Py]+陽離子組成,[BzNO2Py]+陽離子之間存在C-H…O氫鍵和p…π作用,而陽離子和陰離子通過C-H…Cl氫鍵相連;標(biāo)題化合物分子經(jīng)由這些弱的氫鍵而形成二維網(wǎng)狀結(jié)構(gòu).
四氯合鈷(II)酸根;芐基-2-硝基吡啶鎓離子;季銨鹽;合成;晶體結(jié)構(gòu)
取代芐基吡啶鎓陽離子(簡寫為[4-RBzPy]+,R為 H,F(xiàn),Cl,Br,I,CN,NO2)是一類彎曲的多功能有機(jī)陽離子,在組裝含 [M(mnt)2]n-(M 為Cu,Ni離子;mnt為馬來二氰基二硫烯;n=1or 2)和[Ni(tdas)2]2-(tdas為1,2,5-噻唑-3,4-二硫烯)等配陰離子的無機(jī)-有機(jī)雜化材料方面發(fā)揮著重要作用[1-5].含有[MX4]2-(M為Cu,Co,Mn等二價(jià)金屬離子;X為Cl-或Br-)配陰離子和有機(jī)陽離子的無機(jī)-有機(jī)雜化材料因具有新穎的相轉(zhuǎn)變、熱致變色和磁學(xué)等性質(zhì)引起了人們極大的關(guān)注[6-9].最近,本文作者將取代芐基吡啶鎓離子([4-RBzPy]+)引入含[CuX4]2-(X為Cl-或Br-)陰離子體系,獲得一些具有新穎結(jié)構(gòu)或磁學(xué)性能的雜化材料[10-12].本文作者報(bào)道了一種新的含[CoCl4]2-配陰離子的季銨鹽[BzNO2Py]2[CoCl4](CCDC 836428),通過元素分析、紅外光譜和X射線衍射表征了其組成和結(jié)構(gòu).
1.1 試劑與實(shí)驗(yàn)儀器
美國Perkin-Elmer 240C型元素分析儀;美國Nicolet FT-IR紅外光譜儀;德國Bruker Smart CCD單晶衍射分析儀(Mo Kα射線(λ=0.071 073nm).芐氯、2-硝基吡啶和CoCl2·6H2O等試劑均為市售分析純.氯化芐基-2-硝基吡啶([BzNO2Py]Cl)按文獻(xiàn)[13]方法合成.
1.2 季銨鹽的合成
取0.25g(0.5mmol)[BzNO2Py]Cl于錐形瓶中,加入0.12g(0.5mmol)CoCl2·6H2O,以20mL甲醇為溶劑,再加入1mL濃鹽酸,加熱攪拌回流1h,過濾,靜置,自然揮發(fā)5周,得到藍(lán)色晶體0.23g,產(chǎn)率72%.
1.3 季銨鹽晶體結(jié)構(gòu)的測定
選取尺寸為0.15mm×0.19mm×0.27mm的藍(lán)色晶體用于結(jié)構(gòu)分析,在Bruker Smart CCD單晶衍射分析儀上,在291(2)K下,采用石墨單色器單色化的Mo Kα射線(λ=0.071 073nm),以φ-ω掃描方式共收集到18 969個(gè)衍射點(diǎn),其中可觀測的獨(dú)立衍射點(diǎn)[I>2σ(I)]為4 309個(gè),強(qiáng)度因子經(jīng)經(jīng)驗(yàn)吸收校正,晶體結(jié)構(gòu)采用SHELXS-97程序由直接法解出[14].對非氫原子坐標(biāo)及其各向異性溫度因子進(jìn)行全矩陣最小二乘法精修.季銨鹽的晶體學(xué)數(shù)據(jù)和結(jié)構(gòu)精修信息列于表1.
表1 季銨鹽的晶體學(xué)數(shù)據(jù)Table 1 Crystal data of the quaternary ammonium salt
2.1 季銨鹽的元素分析、紅外光譜和電子噴霧質(zhì)譜
季銨鹽的元素分析的實(shí)測值為C,45.61%;H,3.64%;N,8.79%;計(jì)算值為C,45.67%;H,3.51%;N,8.88%;由此可見測定值與化學(xué)式[BzNO2Py]2[CoCl4](C24H22N4O4Cl4Co)的計(jì)算值基本吻合.季銨鹽紅外光譜中3 055cm-1、2 924cm-1和2 847cm-1處的峰分別為苯環(huán)、吡啶環(huán)和CH2中的C-H伸縮振動(dòng).1 626cm-1和1 485cm-1處的峰為苯環(huán)和吡啶環(huán)中的═C C和═C N伸縮振動(dòng),1 525cm-1和1 348cm-1為硝基特征峰,苯環(huán)和吡啶環(huán)中C-H的彎曲振動(dòng)吸收出現(xiàn)在773cm-1和742cm-1處[15].
2.2 季銨鹽的晶體結(jié)構(gòu)
晶體結(jié)構(gòu)分析表明,所合成的季銨鹽屬單斜晶系,空間群為P21/c,其分子結(jié)構(gòu)如圖1所示,主要的鍵長和鍵角列于表2.由圖1可知,季銨鹽分子由1個(gè) [CoCl4]2-陰離子和2個(gè) [BzNO2Py]+陽離子組成.其中[CoCl4]2-呈現(xiàn)出變形四面體結(jié)構(gòu),Co-Cl平均鍵長是0.228 26nm,Cl-Co-Cl的鍵角范圍為105.05°~114.93°,這些鍵長和鍵角與文獻(xiàn)報(bào)道的類似含[CoCl4]2-配陰離子化合物的鍵參數(shù)相似[16-17].對于含 N(1)的[BzNO2Py]+陽離子,吡啶環(huán)鄰位的硝基中2個(gè)O原子和1個(gè)N原子均偏離吡啶環(huán)平面,偏離值為0.025 9nm(O(1)),-0.050 3nm(O(2))和-0.008 4nm(N(1)),苯環(huán)和吡啶環(huán)與C(6)-C(7)-N(1)所確定的參考平面之間的二面角分別為104.6°和16.6°,而苯環(huán)和吡啶環(huán)的二面角為100.3°;對于含N(3)的[BzNO2Py]+陽離子,吡啶環(huán)鄰位的硝基中2個(gè)O原子和1個(gè)N原子偏離值為0.049 8nm(O(3)),-0.027 4nm(O(4))和-0.007 4nm(N(4)),苯環(huán)和吡啶環(huán)與C(18)-C(19)-N(3)平面之間的二面角為106.1°和22.0°,苯環(huán)和吡啶環(huán)的二面角為102.5°.
圖1 季銨鹽的分子結(jié)構(gòu)式Fig.1 Molecular structure of the quaternary ammonium salt
表2 季銨鹽的主要鍵長和鍵角Table 2 Selected bond lengths and angles for the quaternary ammonium salt
季銨鹽中[BzNO2Py]+陽離子之間存在兩類弱相互作用;(1)一個(gè)陽離子吡啶環(huán)上硝基中的氧原子與另一個(gè)吡啶環(huán)之間的p…π作用[18],如圖2所示,O(3)與吡啶環(huán)中心的距離為0.315 8nm;(2)C(12)-H(12)…O(1)、C(15)-H(15)…O(1)和C(19)-H(19B)…O(1)氫鍵作用[19](表3).[CoCl4]2-陰離子和[BzNO2Py]+陽離子之間通過分子間C-H…Cl[19-21]氫鍵相連 (表3).這些弱的氫鍵使季銨鹽形成了二維網(wǎng)狀結(jié)構(gòu)(圖3).
圖2 相鄰陽離子之間的p…π堆積作用Fig.2 The p…πinteractions between the neighboring cations
圖3 季銨鹽沿a軸方向的堆積圖Fig.3 The stacking diagram of the quaternary ammonium salt as viewed along aaxis
表3 季銨鹽中氫鍵的鍵長和鍵角Table 3 The bond lengths and angles for hydrogen bonds of the quaternary ammonium salt
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Synthesis and crystal structure of tetrachlorocobaltate(II)-benzyl-2-nitropyridinium quaternary ammonium salt
A new quaternary ammonium salt containing[CoCl4]2-anion,[BzNO2Py]2[CoCl4]([BzNO2Py]+is benzyl-2-nitropyridinium ion)was synthesized.The composition and structure of as-synthesized complex were characterized by elemental analysis,infrared spectrometry and single crystal X-ray diffraction.Results show that the title compound is in the monoclinic system of space group P21/c,with cell parameters of a=0.779 3(1)nm,b=1.849 3(2)nm,c=1.881 4(2)nm,β=97.56(1)°,V =2.688 0(5)nm3,Z =4,Dc=1.560g/cm3,GOOF=1.036,R1=0.055 9,and wR2=0.151 5.The molecule of the title compound consists of one tetrahedral[CoCl4]2-anion and two[BzNO2Py]+cation.There are C-H…O hydrogen bond and p…πinteraction between adjacent[BzNO2Py]+cations,while the anions and cations are linked by the C-H…Cl hydrogen bonds.These weak interactions result in a network structure in the title compound molecule.
tetrachlorocobaltate(II);benzyl-2-nitropyridium;quaternary ammonium salt;synthesis;crystal structure
O 614.1
A
1008-1011(2012)04-0014-05
2011-12-10.
廣東省2011年大學(xué)生創(chuàng)新實(shí)驗(yàn)項(xiàng)目(1056411137),華南農(nóng)業(yè)大學(xué)2010年優(yōu)秀本科生“紅滿堂計(jì)劃”研究項(xiàng)目,華南農(nóng)業(yè)大學(xué)“211工程”三期重點(diǎn)建設(shè)項(xiàng)目 (2009B010100001).
殷文濤(1989-),男,本科生.研究方向?yàn)闊o機(jī)合成化學(xué).*
.E-mail:niclchem@scau.edu.cn.