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강필재,전용군,김영훈,최문근 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.9
The multitopic ligand, 5-(pyridine-3-yloxy)isophthalic acid (m-POiPH2, 1), containing two different coordination sites of pyridine and isophthalic acid linked by the C?O?C bond, is prepared. The reaction of 1 with half sandwich complexes of [Cp*Rh(OAc)2] (Cp* = ?5-C5Me5), [Cp*Ir(OAc)2], and [(p-cymene)Ru(OAc)2 afford the construction of binuclear metallocyclophanes [(Cp*Ir)2(m-POiP)2] (2), [(Cp*Rh)2(m-POiP)2 (3), and [((p-cymene)Ru)2(m-POiP)2] (4) in high yields. Crystal structures of 2, 3, and 4 illustrate binuclear metallocyclophanes constructed by cyclometallation by ortho-C?H activation and coordination of N-donor with metals which is confirmed by a single crystal X-ray diffraction (SC-XRD). Each metallocyclophanes shows unique packing structure by intermolecular hydrogen bonding; 2 and 3 shows 1D linear chain network, while the packing of 4 presents the 2D sheet.
Anion-Templated Self-Assembly of Silver(I) Frameworks Bridged by μ-, μ3-, μ4-1,2,4,5-Tetrazine
김영훈,강필재,전용군,조현모,최문근 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.2
The formation of Ag(I)-1,2,4,5-tetrazines(ttz) based coordination polymers via the Ag?N coordination and anion?π interactions is described. Coordination-driven self-assembly is a key step to construct coordination polymers, and ttz, an electron-deficient aromatic ring compound, forms interesting anion?π interactions. In this study, a series of silver salts, AgX [X = BF4, PF6 and CF3SO3 (OTf)], is introduced to determine the influence of shape and size of anions on the formation of coordination polymers, {[Ag(ttz)](BF4)}n (1), {[Ag2(ttz)3](PF6)2}n (2) and {[Ag2(ttz)3(OTf)](OTf)}n (3). It shows different types of channels in polymers and the coordination modes of ttz (?, ?3, and ?4). The structure of coordination polymers and the influence of anion?π interactions are revealed by single crystal X-ray diffraction. In particular, 3 shows not only the anion?π interaction but also the coordination between the anion and Ag(I) which contributes to the unique framework compared to 1 and 2.
Tae-O Choi(최태오),Kyong-Ho Kim(김경호),Gun-Do Kim(김군도),Tae-Jin Choi(최태진),Young Jae Jeon(전용재) 한국생명과학회 2017 생명과학회지 Vol.27 No.10
미세조류 Chlorella vulgaris는 바이오 디젤 생산을 위한 중요한 대체원료 중 하나로 간주되어 왔으나, 이러한 미생물의 산업적 적용은 낮은 바이오 매스와 지질 생산성에 의해 제약을 받아왔다. 따라서 이러한 문제를 극복하기 위해 본 연구는 자외선을 이용한 무작위 돌연변이 유발 기술을 통해 높은 지질 및 바이오 매스 생산성을 가지는 C. vulgaris 균주를 분리하고 그 특성을 규명하였으며, 두 가지 유형의 대량 생산 시스템을 이용하여 바이오 매스 및 지질 함량의 산출량을 비교하였다. 분리된 돌연변이 균주 중, 특히 실험실 조건에서 UBM1-10으로 명명된 돌연변이 균주는 야생형 균주에 비해 약 1.5배 높은 세포 수율 및 지질 함량을 보였다. 이러한 결과를 바탕으로 UBM1-10을 선택하여 TBPR (tubular photobioreactor)과 OPR (open pond type reactor)의 두 가지 유형의 반응기를 사용하여 실외 배양 조건에서 배양하였다. 그 결과 TBPR에서 재배된 돌연변이 균주의 세포 수율은(2.6 g l<SUP>-1</SUP>)OPR에서 배양된 균주의 세포 수율(0.5 g l<SUP>-1</SUP>)과 비교하였을 때 약 5배 이상의 높은 세포 수율을 나타내었으며, 대량 배양 후, UBM1-10 및 모 균주의 조 지방 함량 및 조성 등에 대해 추가로 조사를 실시하였다. 그 결과 C. vulagris UBM1-10균주의 지질함량(0.3% w/w)이 모 균주의 지질함량(0.1%)에 비해 약 3배 이상의 조 지방 함량을 보유함을 확인하였다. 따라서 이 연구는 바이오 디젤 생산 자원으로서 C. vulgaris의 경제적 잠재성이 photoreactor type의 선택 및 전략적 돌연변이 분리 기술을 통해 증가 될 수 있음을 보여 주었다. The microalgae Chlorella vulgaris has been considered an important alternative resource for biodiesel production. However, its industrial-scale production has been constrained by the low productivity of the biomass and lipid. To overcome this problem, we isolated and characterized a potentially economical oleaginous strain of C. vulgaris via the random mutagenesis technique using UV irradiation. Two types of mass production systems were compared for their yield of biomass and lipid content. Among the several putatively oleaginous strains that were isolated, the particular mutant strain designated as UBM1-10 in the laboratory showed an approximately 1.5-fold higher cell yield and lipid content than those from the wild type. Based on these results, UBM1-10 was selected and cultivated under outdoor conditions using two different types of reactors, a tubular-type photobioreactor (TBPR) and an open pond-type reactor (OPR). The results indicated that the mutant strain cultivated in the TBPR showed more than 5 times higher cell concentrations (2.6 g l<SUP>-1</SUP>) as compared to that from the strain cultured in the OPR (0.5 g l-1). After the mass cultivation, the cells of UBM1-10 and the parental strain were further investigated for crude lipid content and composition. The results indicate a 3-fold higher crude lipid content from UBM1-10 (0.3%, w/w) as compared to that from the parent strain (0.1% w/w). Therefore, this study demonstrated that the economic potential of C. vulgaris as a biodiesel production resource can be increased with the use of a photoreactor type as well as the strategic mutant isolation technique.