ชื่อเรื่อง | : | Dinuclear copper(II) complexes with ferromagnetic and antiferromagnetic interactions mediated by a bridging oxalato group : structures and magnetic properties of [Cu2L4(mu-C2O4)](PF6)(2)(H2O)(2) and [Cu2L2(mu-C2O4)(NO3)(2)((CH3)(2)NCOH)(2)] (L = di-2-pyridylamine) |
นักวิจัย | : | Sujittra Youngme , P. Gunnasoot , Narongsak Chaichit , Chaveng Pakawatchai |
คำค้น | : | Dinuclear Cu-11 complexes , Ferromagnetic , Antiferromagnetic , Crystal-structure |
หน่วยงาน | : | สถาบันวิจัยและให้คำปรึกษาแห่ง มหาวิทยาลัยธรรมศาสตร์ |
ผู้ร่วมงาน | : | - |
ปีพิมพ์ | : | 2547 |
อ้างอิง | : | Transition metal chemistry. 29,8 (2004), pp. 840-846 , 0340-4285 , http://dspace.library.tu.ac.th/handle/3517/1190 |
ที่มา | : | - |
ความเชี่ยวชาญ | : | - |
ความสัมพันธ์ | : | - |
ขอบเขตของเนื้อหา | : | - |
บทคัดย่อ/คำอธิบาย | : | Two dinuclear Cu-11 complexes of formula [CU2(dpyam)(4)(mu-C2O4)](PF6)(2)(H2O)(2) (1) and [CU2(dpyam)(2)(mu-C2O4)(NO3)(2)(DMF)(2)] (2) (dpyam = di-2-pyridylamine) have been synthesized and their spectroscopic and magnetic properties characterized. Complex (1) crystallizes in the non-centrosymmetric monoclinic space group Pc, while (2) crystallizes in the non-centrosymmetric triclinic space group P1. Compound (1) involves the compressed octahedral Cu-11 environment, whereas (2) exhibits an elongated octahedral Cull geometry. Both complexes contain six-coordinate metal centers bridged by planar bis-didentate oxalate group. The geometry, spectroscopic properties and the effective magnetic moment of (1) are very close to those of the recently published [Cu-2(dpyam)(4) (mu-C2O4)](CIO4)(2)(H2O)(3) and [Cu-2(dpyam)(4)(mu-C-2-O-4)](BF4)(2)(H2O)(3). Thus (1) is expected to exhibit a very weak ferromagnetic interaction between the Cu-11 centers which is confirmed by EPR spectrum. Those of (2) are comparable to those of the recently published [Cu-2(dpyam)(2)(mu-C2O4)(NO3)(2)(DMSO)(2)]. Therefore a strong antiferomagnetic interaction is expected. The effective magnetic moment at room temperature of (1) was measured to be 2.55 BM/dimer, which agrees with the spin only value of Cu-11, 2.45 BM calculated for two uncoupled spin = 1/2 centers. In (2) the room temperature effective magnetic moment of 2.16 BM/dimer indicates the partial spin paring by antiferromagnetic coupling. This is confirmed by the e.p.r. spectrum and is explained as a result of the magnetic interaction between the coplanar d(x2-y2) orbitals on the two copper atoms. |
บรรณานุกรม | : |
Sujittra Youngme , P. Gunnasoot , Narongsak Chaichit , Chaveng Pakawatchai . (2547). Dinuclear copper(II) complexes with ferromagnetic and antiferromagnetic interactions mediated by a bridging oxalato group : structures and magnetic properties of [Cu2L4(mu-C2O4)](PF6)(2)(H2O)(2) and [Cu2L2(mu-C2O4)(NO3)(2)((CH3)(2)NCOH)(2)] (L = di-2-pyri.
กรุงเทพมหานคร : สถาบันวิจัยและให้คำปรึกษาแห่ง มหาวิทยาลัยธรรมศาสตร์ . Sujittra Youngme , P. Gunnasoot , Narongsak Chaichit , Chaveng Pakawatchai . 2547. "Dinuclear copper(II) complexes with ferromagnetic and antiferromagnetic interactions mediated by a bridging oxalato group : structures and magnetic properties of [Cu2L4(mu-C2O4)](PF6)(2)(H2O)(2) and [Cu2L2(mu-C2O4)(NO3)(2)((CH3)(2)NCOH)(2)] (L = di-2-pyri".
กรุงเทพมหานคร : สถาบันวิจัยและให้คำปรึกษาแห่ง มหาวิทยาลัยธรรมศาสตร์ . Sujittra Youngme , P. Gunnasoot , Narongsak Chaichit , Chaveng Pakawatchai . "Dinuclear copper(II) complexes with ferromagnetic and antiferromagnetic interactions mediated by a bridging oxalato group : structures and magnetic properties of [Cu2L4(mu-C2O4)](PF6)(2)(H2O)(2) and [Cu2L2(mu-C2O4)(NO3)(2)((CH3)(2)NCOH)(2)] (L = di-2-pyri."
กรุงเทพมหานคร : สถาบันวิจัยและให้คำปรึกษาแห่ง มหาวิทยาลัยธรรมศาสตร์ , 2547. Print. Sujittra Youngme , P. Gunnasoot , Narongsak Chaichit , Chaveng Pakawatchai . Dinuclear copper(II) complexes with ferromagnetic and antiferromagnetic interactions mediated by a bridging oxalato group : structures and magnetic properties of [Cu2L4(mu-C2O4)](PF6)(2)(H2O)(2) and [Cu2L2(mu-C2O4)(NO3)(2)((CH3)(2)NCOH)(2)] (L = di-2-pyri. กรุงเทพมหานคร : สถาบันวิจัยและให้คำปรึกษาแห่ง มหาวิทยาลัยธรรมศาสตร์ ; 2547.
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