 | ||||||||
 | | | | | ||||
| | | ||||||
| |
BibTeX file of [Hong99] [show it without abstract] @article{Hong99, author={Chang Seop Hong and Sang-Kil Son and Yoon Sup Lee and Moo-Jin Jun and Youngkyu Do}, title={High-dimensional manganese({II}) compounds with noncovalent and/or covalent bonds derived from flexible ligands: Self-assembly and structural transformation}, journal={Inorg. Chem.}, volume={38}, pages={5602--5610}, year={1999}, number={24}, keywords={molecular magnet; experiment; KAIST;}, url={https://doi.org/10.1021/ic990611w}, doi={10.1021/ic990611w}, abstract={A hydrogen- and covalent-bonded 3D array, [Mn(bpe)(H$_2$O)$_4$]$_n$(ClO$_4$)$_{2n}$(bpe)$_{4n}$(H$_2$O)$_{2n}$ (\textbf{2}) [bpe=1,2-bis(4-pyridyl)-ethane], a covalent-bonded 3D network, [Mn(bpe)$_{1.5}$(H$_2$O)(tp)]$_n$(H$_2$O)$_n$ (\textbf{3}) [tp=terephthalate], and a covalent-bonded 2D sheet, [Mn(bpe)(N$_3$)$_2$]$_n$ (\textbf{4}), have been synthesized and characterized by spectroscopic data and singlecrystal X-ray diffraction studies. Complex \textbf{2} contains two types of packing bpe molecules: One type of bpe molecules (=N31-bpe and symmetry-related bpe) run along the chain direction, and the other type of bpe molecules (=N11-bpe and N21-bpe) are slanted to the chain linked by bridging bpe (=N1-bpe). The chain is coupled with hydrogen bonds via N31-bpe, while hydrogen bonds through packing bpe molecules of N11- and N21-bpe sew the chains, leading to a 3D interlocking network structure. The bpe ligands in \textbf{3} have an anti conformation for the bridging bpe and a gauche conformation for the capping bpe with a dihedral angle between the two pyridyl rings of 44.5°. The tp ligand acts as a linker of three metal ions through the unidentate and bridging modes, leading to the formation of a 2D layer. The final molecular dimensionality in \textbf{3} is determined from adding bpe ligands to the 2D sheet connected by tp ligands, resulting in a covalent-bonded 3D array where the bridging bpe ligands link the tp-bridged layers. The manganese(II) center in \textbf{4} consists of four equatorial azido nitrogen atoms and two axial bpe nitrogen atoms. The one-dimensional chains formed by two azido bridging ligands are interconnected by bpe ligands, each of which has two pyridyl rings with a dihedral angle of 67° leading to a two-dimensional sheet. Variable-temperature magnetic susceptibility data of \textbf{2} and \textbf{4} have been fitted to the infinite-chain model ($H$=$-$$J$ \sum $S_{Ai}$ \cdot $S_{Ai+1}$) derived by Fisher under the molecular field approximation ($J$$´$). Obtained exchange parameters are $J$=$-0.083$ cm$^{-1}$, $g$=$2.0$ for \textbf{2} and $J$=$-12.5$ cm$^{-1}$, $g$=$2.0$, $J$$´$=$1.3$ cm$^{-1}$ for \textbf{4}. In the case of \textbf{3}, the magnetic nature was interpreted by the dimer model ($H$=$-$$J$ $S_1$·$S_2$), affording parameters $J$=$-0.96$ cm$^{-1}$, $g$=$1.99$, $J$$´$=$-0.005$ cm$^{-1}$. MO calculations on a hypothetical dimeric unit (NH$_3$)$_5$Mn-bpe-Mn(NH$_3$)$_5$ are discussed to evaluate the magnetic nature for the bpe-bridged system \textbf{4}.} } Chang Seop Hong, Sang-Kil Son, Yoon Sup Lee, Moo-Jin Jun, and Youngkyu Do, High-dimensional manganese(II) compounds with noncovalent and/or covalent bonds derived from flexible ligands: Self-assembly and structural transformation, Inorg. Chem. 38, 5602–5610 (1999) ![[abstract]](/biblio/img/abstract.gif) [abstract]![[link]](/biblio/img/link.gif) doi:10.1021/ic990611w
made by ZN | | | ||||
| | | ||||||
| | | | | ||||
|
저작권에 대한 본 사항이 명시되는 한, 어떠한 정보 매체에 의한 본문의 전재나 발췌도 무상으로 허용됩니다. [copyleft] | | ||||||
