CAJ | 학술논문

研究了咔唑、咔唑-9-乙酸、3-溴-咔唑-9-乙酸在缺氧条件下对天然苝醌化合物痂囊腔菌素A （简记为 EA ）的荧光猝灭行为；由竹红菌甲素（HA）和乙素（HB）的荧光寿命估算了EA在乙腈中的荧光寿命，并进而计算了三个咔唑化合物的双分子猝灭速度常数．结果表明，三个咔唑化合物在EA的可见光吸收区无光吸收，据此推测其对EA的荧光猝灭作用归因于咔唑化合物作为电子给体而EA作为电子受体的光致电子转移作用．三个咔唑化合物的Stern-Volmer猝灭常数分别为698、704和1063 L ·mol-1；乙酸基对咔唑环的光致电子转移速率几乎没有影响，而溴原子取代能够增加咔唑化合物对EA的荧光猝灭程度和光致电子转移速率．此外，EA在乙腈中的荧光寿命为19．8 ns ，而三个咔唑化合物的双分子猝灭速率常数分别为35．2×1011，35．6×1011和53．7×1011 L· mol-1·s-1．
연구료잡서、잡서-9-을산、3-추-잡서-9-을산재결양조건하대천연패곤화합물가낭강균소A （간기위 EA ）적형광졸멸행위；유죽홍균갑소（HA）화을소（HB）적형광수명고산료EA재을정중적형광수명，병진이계산료삼개잡서화합물적쌍분자졸멸속도상수．결과표명，삼개잡서화합물재EA적가견광흡수구무광흡수，거차추측기대EA적형광졸멸작용귀인우잡서화합물작위전자급체이EA작위전자수체적광치전자전이작용．삼개잡서화합물적Stern-Volmer졸멸상수분별위698、704화1063 L ·mol-1；을산기대잡서배적광치전자전이속솔궤호몰유영향，이추원자취대능구증가잡서화합물대EA적형광졸멸정도화광치전자전이속솔．차외，EA재을정중적형광수명위19．8 ns ，이삼개잡서화합물적쌍분자졸멸속솔상수분별위35．2×1011，35．6×1011화53．7×1011 L· mol-1·s-1．
The fluorescence quenching of elsinochrome A (denoted as EA ) ,a natural peryle-nequinone ,by carbazole ,carbazol-9-yl-acetic acid ,and 3-Br-carbazol-9-yl-acetic acid under an-aerobic condition was studied .The fluorescence lifetime of EA in acetonitrile was estimated from the lifetimes of hypocrellin A and hypocrellin B ;and the bimolecular quenching rate con-stants of the three carbazole compounds were calculated accordingly .Results indicate that the three carbazole compounds exhibit no absorbance in the visible light absorbance area of EA . Hence it can be inferred that they quench the fluorescence of EA by photoinduced electron transfer with carbazole compounds as the donors and EA as the acceptor .In the meantime ,the quenching constants of the three carbazole compounds are 698 ,704 and 1 063 L ·mol-1 ,re-spectively .Besides ,the acetic acid group has almost no effect on photoinduced electron transfer rate ,w hile the substitution of bromine atom on carbazole ring increases the photoinduced elec-tron transfer rate .Moreover ,EA in acetonitrile has a fluorescence lifetime of 1 9.8 ns ,and the bimolecular quenching rate constants of the three carbazole compounds are 3 5.2 × 1011 , 3 5.6 × 1011 and 5 3.7 × 1011 L ·mol-1 ·s-1 ,respectively .