CN1829775A - 花青化合物、光学记录材料和光学记录介质 - Google Patents

花青化合物、光学记录材料和光学记录介质 Download PDF

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CN1829775A
CN1829775A CNA2004800217041A CN200480021704A CN1829775A CN 1829775 A CN1829775 A CN 1829775A CN A2004800217041 A CNA2004800217041 A CN A2004800217041A CN 200480021704 A CN200480021704 A CN 200480021704A CN 1829775 A CN1829775 A CN 1829775A
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optical recording
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cyanine compound
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矢野亨
滋野浩一
冈田光裕
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ASAHI ELECTRO-CHEMICAL Co
Adeka Corp
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Abstract

本发明提供显示出更适合于光学记录用途的热行为的新型花青化合物、含有该化合物的光学记录材料和光学记录介质。本发明提供的由上述通式(I)表示的花青化合物,式中,环A和环B是可以具有取代基的苯环或萘环;R1~R4之中的相邻接的2个基团(R1和R2或R3和R4)或者全部为苄基,剩余的基团为碳原子数为1~4的烷基或相连结而形成3~6元环的基团;Y1和Y2各自独立地是碳原子数为1~30的有机基团;Anm-是m价的阴离子;m是1或2的整数;p是保持电荷为中性的系数。

Description

花青化合物、光学记录材料和光学记录介质
技术领域
本发明涉及新型的花青化合物,更详细地说,本发明涉及可用作光学元件等、尤其是可用作图像显示装置的滤光器或用于利用激光的光学记录材料的具有特定结构的花青化合物。
背景技术
将在波长为500~700nm的范围内具有大强度吸收的化合物、特别是其最大吸收(λmax)为550~620nm的化合物用作DVD-R等的光学记录介质的记录层以及液晶显示器(LCD)、等离子显示板(PDP)、电致发光显示器(ELD)、阴极射线管显示器(CRT)、荧光显示管和场致发射显示器等图像显示装置的滤光器的光学元件。
作为上述光学元件,大量研究了灵敏度较高的具有吲哚环的花青化合物。该花青化合物,特别是作为以DVD-R为代表的光学记录介质的记录元件由于具有与记录高速化相对应的优点,因此公开的例子很多,且在下述专利文献1~4等中被公开。例如,在下述专利文献1~3中,记载了在吲哚骨架3位上可以具有芳烷基的花青化合物,这些花青化合物与本发明的花青化合物类似,但是并没有记载在花青化合物中引入芳烷基的方法及其效果。另外,包括这些的现有的花青化合物在热分解性方面有问题。作为光学记录材料,优选的是,分解温度低的材料,但是在下述专利文献1~4中记载的花青类化合物在这方面并不具有充分的特性。
专利文献1:特开平10-278426号公报
专利文献2:特开平11-227331号公报
专利文献3:特开平11-277904号公报
专利文献4:特开2002-52829号公报
发明内容
如上所述,发明所要解决的问题点是,迄今为止未能得到的作为光学记录介质的记录元件特别有用的、适用于高速记录且显示出热分解行为的化合物。
因此,本发明的目的在于提供显示出更适合于光学记录用途的热行为的新型花青化合物、含有该化合物的光学记录材料和光学记录介质。
本发明者等考虑到热分解行为的适当化和吸收波长的适当化对于实现可适应于高速记录的灵敏度是有效的,进行了反复研究,结果发现具有特定的分子结构的花青类化合物可以解决上述课题。
本发明是基于上述认识而提出的,提供由下述通式(I)表示的花青化合物、在基材上形成光学记录层而得到的光学记录介质的该光学记录层中使用的且含有该花青化合物的光学记录材料、以及在基材上形成由该光学记录材料构成的薄膜作为光学记录层而得到的光学记录介质。
式中,环A和环B是可以具有取代基的苯环或萘环;R1~R4之中的相邻接的两个基团(R1和R2或R3和R4)或者全部为苄基,剩余的基团为碳原子数为1~4的烷基或相连结而形成3~6元环的基团;Y1和Y2各自独立地是碳原子数为1~30的有机基团;Anm-是m价的阴离子;m是1或2的整数;p是保持电荷为中性的系数。
附图说明
图1-a表示在制造例1中得到的化合物No.10的六氟化磷盐的1H-NMR谱图。
图1-b是图1-a的部分放大图。
图2-a表示在制造例2中得到的化合物No.12的六氟化磷盐的1H-NMR谱图。
图2-b是图2-a的部分放大图。
图2-c是图2-a的部分放大图。
图3-a表示在制造例3中得到的化合物No.19的六氟化磷盐的1H-NMR谱图。
图3-b是图3-a的部分放大图。
图3-c是图3-a的部分放大图。
具体实施方式
上述通式(I)所示的本发明的花青类化合物是在特定部位具有苄基的新型化合物,与在DVD-R用途的光学记录材料中使用的其它的花青类化合物相比,具有分解温度更低,吸收波长适当的特征。
在上述通式(I),作为环A和环B所示的可以具有取代基的苯环或萘环的取代基,可以列举出氟、氯、溴、碘等卤代基;甲基、乙基、丙基、异丙基、丁基、仲丁基、叔丁基、异丁基、戊基、异戊基、叔戊基、己基、环己基、庚基、异庚基、叔庚基、正辛基、异辛基、叔辛基、2-乙基己基等烷基;苯基、萘基、2-甲基苯基、3-甲基苯基、4-甲基苯基、4-乙烯基苯基、3-异丙基苯基等芳基;甲氧基、乙氧基、丙氧基、异丙氧基、丁氧基、仲丁氧基、叔丁氧基等烷氧基;甲硫基、乙硫基、丙硫基、异丙硫基、丁硫基、仲丁硫基、叔丁硫基等烷基硫基;硝基、氰基等。
另外,作为R1~R4所示的基团,R1和R2为苄基、或者R3和R4为苄基或者R1~R4的全部为苄基。在R1~R4为苄基以外的基团时,是碳原子数为1~4的烷基或R1和R2或者R3和R4相连结形成3~6元环的基团。作为该烷基可以列举出甲基、乙基、丙基、异丙基、丁基、仲丁基、叔丁基、异丁基等;作为该3~6元环基团,可以列举出环丙烷-1,1-二基、环丁烷-1,1-二基、2,4-二甲基环丁烷-1,1-二基、3,3-二甲基环丁烷-1,1-二基、环戊烷-1,1-二基、环己烷-1,1-二基、四氢吡喃-4,4-二基、噻(thiane)-4,4-二基、哌啶-4,4-二基、N-取代哌啶-4,4-二基、吗啉-2,2-二基、吗啉-3,3-二基、N-取代吗啉-2,2-二基,N-取代吗啉-3,3-二基等;作为该N-取代基,可以列举出作为环A的取代基所例示的那些基团。
作为由Y1或Y2所表示的碳原子数为1~30的有机基,没有特别的限定,例如可以列举出甲基、乙基、丙基、异丙基、丁基、仲丁基、叔丁基、异丁基、戊基、异戊基、叔戊基、己基、环己基、环己基甲基、2-环己基乙基、庚基、异庚基、叔庚基、正辛基、异辛基、叔辛基、2-乙基己基、壬基、异壬基、癸基、十二烷基、十三烷基、十四烷基、十五烷基、十六烷基、十七烷基、十八烷基等烷基;乙烯基、1-甲基乙烯基、2-甲基乙烯基、丙烯基、丁烯基、异丁烯基、戊烯基、己烯基、庚烯基、辛烯基、癸烯基、十五烯基、1-苯基丙烯-3-基等链烯基;苯基、萘基、2-甲基苯基、3-甲基苯基、4-甲基苯基、4-乙烯基苯基、3-异丙基苯基、4-异丙基苯基、4-丁基苯基、4-异丁基苯基、4-叔丁基苯基、4-己基苯基、4-环己基苯基、4-辛基苯基、4-(2-乙基己基)苯基、4-硬脂酰基苯基、2,3-二甲基苯基、2,4-二甲基苯基、2,5-二甲基苯基、2,6-二甲基苯基、3,4-二甲基苯基、3,5-二甲基苯基、2,4-二叔丁基苯基、环己基苯基等烷基芳基;苄基、苯乙基、2-苯基丙烷-2-基、二苯基甲基、三苯基甲基、苯乙烯基、肉桂基等芳基烷基,以及这些烃基是插入有醚键、硫醚键的那些基团,例如可以列举出2-甲氧基乙基、3-甲氧基丙基、4-甲氧基丁基、2-丁氧基乙基、甲氧基乙氧基乙基、甲氧基乙氧基乙氧基乙基、3-甲氧基丁基、2-苯氧基乙基、2-甲硫基乙基、2-苯硫基乙基;而且,这些基团可以由烷氧基、链烯基、硝基、氰基、卤原子等取代。
对于上述Y1或Y2,如果取代基较大,则出现本发明的花青化合物的摩尔吸光系数变小,并对感度有影响的情况,因此,上述Y1或Y2优选碳原子数为1~8的烃基,更优选碳原子数为1~8的烷基。
另外,作为由Anm-表示的阴离子,例如,作为一价阴离子,可以列举出氯阴离子、溴阴离子、碘阴离子、氟阴离子等卤素阴离子;高氯酸阴离子、氯酸阴离子、硫氰酸阴离子、六氟化磷阴离子、六氟化锑阴离子、四氟化硼阴离子等无机系阴离子;苯磺酸阴离子、甲苯磺酸阴离子、三氟甲烷磺酸阴离子、二苯基胺-4-磺酸阴离子、2-氨基-4-甲基-5-氯代苯磺酸阴离子、2-氨基-5-硝基苯磺酸阴离子等有机磺酸阴离子;辛基磷酸阴离子、十二烷基磷酸阴离子、十八烷基磷酸阴离子、苯基磷酸阴离子、壬基苯基磷酸阴离子、2,2’-亚甲基双(4,6-二叔丁基苯基)膦酸阴离子等有机膦酸系阴离子等;作为二价阴离子,例如可以列举出苯二磺酸阴离子、萘二磺酸阴离子等。另外,根据需要也可使用具有使处于激发态的活性分子去激发(猝灭)功能的猝灭阴离子和在环戊二烯基环上具有羧基、膦酸基、磺酸基等阴离子性基团的二茂铁、二茂钌等茂金属化合物阴离子等。
作为上述的猝灭阴离子,例如可以列举出由下述通式(A)或(B)表示的、特开昭60-234892号公报、特开平5-43814号公报、特开平6-239028号公报、特开平9-309886号公报、特开平10-45767号公报等中记载的阴离子。
Figure A20048002170400081
式中,M表示镍原子或铜原子;R5和R6表示卤原子、碳原子数为1~8的烷基、碳原子数为6~30的芳基或-SO2-Z基,Z表示烷基、可以由卤原子取代的芳基、二烷基氨基、二芳基氨基、哌啶基或吗啉基;a和b分别表示0~4。另外,R7、R8、R9和R10各自独立地表示烷基、烷基苯基、烷氧基苯基或卤代苯基。
作为上述通式(I)所示的本发明的花青化合物的具体例子,可以列举出下述化合物No.1~27。另外,在以下例子中,以省略了阴离子的花青化合物阳离子来表示。
化合物No.1                           化合物No.2                                         化合物No.3
       
Figure A20048002170400083
                   
化合物No.4                        化合物No.5                       化合物No.6
化合物No.7                           化合物No.8                     化合物No.9
Figure A20048002170400086
化合物No.10                       化合物No.11                     化合物No.12
Figure A20048002170400091
化合物No.13                         化合物No.11                化合物No.15
Figure A20048002170400092
化合物No.16                           化合物No.17                 化合物No.18
Figure A20048002170400093
化合物No.19                          化合物No.20                   化合物No.21
化合物No 22                        化合物No.23                    化合物No.24
化合物No.25                          化合物No.26                     化合物No.27
Figure A20048002170400096
由于上述花青化合物阳离子作为化学记录材料的热行为良好,与2个苄基成键的构成吲哚骨架的环(上述通式(I)中的环A和/或环B)优选为萘环(例如,化合物No.10~18、20~27),更优选在吲哚环的e面上缩合苯环的化合物(例如,化合物No.10~16、20~25)。这可以认为是2个苄基和苯并吲哚环的立体位阻所导致的环结构的变形增大所引起的。
另外,如化合物No.19~27所示,R1~R4全部为苄基的化合物,分子整体的变形变大,具有可以得到与上述相同的效果的情况下,是优选的。
前述通式(I)所示的本发明的花青化合物并不受到其制备方法的限制。该花青化合物,例如可以通过使2个作为中间体的2-甲基吲哚季盐衍生物与N,N’-二苯基脒等桥联剂反应得到。另外,2个邻接的苄基可以在得到作为中间体的2-甲基吲哚季盐衍生物的过程中引入。例如,可以以芳基肼作为起始物质,在通过1,1-二苄基丙酮形成吲哚环时引入;或者也可以以芳基肼为起始物质,在通过4-苯基-2-丁酮形成吲哚环时引入1个,在使吲哚环与氯化甲基苯衍生物反应而引入另一个。Y1或Y2可以通过与芳基胺衍生物或吲哚环的NH反应的Y1-D或Y2-D(D是氯、溴、碘等卤代基,苯磺酰氧基、4-甲基苯磺酰氧基、4-氯代苯磺酰氧基等磺酰氧基)引入。作为得到本发明的花青化合物的具体的方法的一个例子,可以列举出下述[化6]所示的路线。
Figure A20048002170400101
式中,环A、环B、R3、R4、Y1、Y2、Anm-、m和p与前述通式(I)相同,D表示氯、溴、碘等卤代基或磺酰氧基。
本发明的花青化合物起到光学元件的功能,特别适合作为光学记录介质的光学记录层。含有本发明的花青化合物的光学记录层使用含有本发明的花青化合物的光学记录材料,在基材上形成薄膜。另外,本发明的光学记录材料包含本发明的花青化合物本身以及本发明花青化合物和后述的有机溶剂和/或各种化合物的混合物。
作为光学记录介质的记录层的形成方法,没有特别的限制,一般地讲,可使用通过旋涂、喷涂、浸渍等在基体上涂布在如下的有机溶剂中溶解有本发明的花青化合物的湿式涂布法,上述溶剂是:甲醇、乙醇等低级醇类;甲基溶纤剂、乙基溶纤剂、丁基溶纤剂、丁基二甘醇等醚醇类;丙酮、甲基乙基酮、甲基异丁基酮、环己酮、双丙酮醇等酮类;乙酸乙酯、醋酸丁酯、醋酸甲氧基乙酯等酯类;丙烯酸乙酯、丙烯酸丁酯等丙烯酸酯类;2,2,3,3-四氟丙醇等氟代醇类;苯、甲苯、二甲苯等烃类;二氯甲烷、二氯乙烷、三氯甲烷等氯代烃类等。作为其它的方法,可以例举出蒸镀法、溅射法等。
上述光学记录层的厚度通常是0.001~10μm,优选为0.01~5μm。
另外,在光学记录介质的光学记录层中的本发明的花青化合物的含量优选为50~100重量%。为了形成这种含量的花青化合物的光学记录层,本发明的光学记录材料优选以本发明的光学记录材料中所含有的固态成分为基准而含有50~100重量%的本发明的花青化合物。
另外,上述光学记录层除了本发明的花青化合物之外,根据需要还可以含有:本发明的花青化合物以外的花青化合物、偶氮类化合物、酞菁类化合物、卟吩类化合物等的可用于光学记录层的化合物;聚乙烯、聚酯、聚苯乙烯、聚碳酸酯等树脂类;表面活性剂;带电防止剂;润滑剂;阻燃剂;受阻胺等自由基捕获剂;二茂铁衍生物等凹坑(pit)形成促进剂;分散剂;抗氧化剂;交联剂;耐光性赋予剂等。此外,上述光学记录层可以含有芳香族亚硝基化合物、胺鎓盐化合物、亚胺鎓盐化合物、双亚胺鎓盐化合物、过渡金属螯合物等作为单态氧等的猝灭剂。这些各种类的化合物在上述光学记录层中优选以0~50重量%的量使用。因此,在本发明的光学记录材料中,这些各种类的化合物的含量,以本发明的光学记录材料中所含有的固态成分为基准,优选为0~50重量%。
设置这样的光学记录层的上述基体的材料没有特别的限制,只要是对写入(记录)光和读取(再生)光基本上是透明的就可以,例如,可以使用聚甲基丙烯酸甲酯、聚对苯二甲酸乙二酯、聚碳酸酯等树脂、玻璃等。另外,根据用途,其形状可以使用卷尺状、卷筒、带状、圆盘等任意形状。
另外,在上述的光学记录层上,也可使用金、银、铝、铜等通过蒸镀法或溅射法形成反射膜,也可通过丙烯酸树脂、紫外线固化性树脂等形成保护层。
本发明的光学记录材料适用于在记录、再生中使用半导体激光的光学记录介质,但是,特别适用于高速记录类型的DVD-R等光盘。
实施例
下面,举出制造例、评价例实施例和比较例更详细地说明本发明。但是,本发明不受到以下的实施例等的任何限制。
[制造例1]化合物No.10的六氟化磷盐的制造
(吲哚衍生物的合成)
在反应烧瓶中加入158.2g的萘基肼、286.0g的1,1-二苄基丙酮、542g的乙醇,在70℃下搅拌1小时。在70℃下,向其中滴加125g的35重量%的盐酸水溶液,在80℃下反应1小时。冷却到室温后,加入200g甲苯,将其用300g水洗涤3次,用无水硫酸钠干燥。将该溶液脱溶剂而得到的残渣用硅胶色谱精制,得到40.0g(收率11.1%)的具有苄基的吲哚衍生物,且改衍生物为茶色液体。
(中间体的合成)
在反应烧瓶中加入18.7g上述得到的吲哚衍生物、12.8g的1-碘化丙烷、39.9g丙醇,在100℃下反应12小时。将其后脱溶剂得到的残渣在5.4g乙醇中加热溶解,在该溶液中加入27g醋酸丁酯,析出晶体。过滤晶体,在80℃下真空干燥2小时,得到4.9g(收率18.4%)的黄色晶体中间体。
(花青化合物的合成)
在反应烧瓶中加入2.71g上述得到的中间体、2.47g下式所示的中间体A、1.56g醋酸酐、8.05g吡啶,在65℃下反应4小时。在其中加入30g氯仿,用30g水洗涤后,加入将4.2g六氟化磷钾溶于20g水后而形成的溶液,在室温下搅拌30分钟,除去水相。在其中加入将2.8g六氟化磷钾溶于15g水后所形成的溶液,在室温下搅拌30分钟,除去水相,再加入将1.4g六氟化磷钾溶于15g水后所形成的溶液,在室温下搅拌30分钟,除去水相。对所得的有机相,用15g水洗涤3次后,用无水硫酸钠干燥,脱溶剂,得到油状物。一边将其加热,使40g甲醇回流,一边滴加。将系统温度降低到25℃,过滤析出的晶体,用甲醇洗涤后,在120℃下真空干燥2小时,得到2.5g(收率64.6%)作为目标物的紫色晶体。对所得的晶体进行分析的结果是,该晶体确定为作为目标物的化合物No.10的六氟化磷盐。分析结果如下所示。
中间体A
分析结果
·光学特性(氯仿,2.326×10-6mol/升)
λmax:589nm、ε:1.26×105
·熔点(通过在氮气中以10℃/分钟的速度升温下的DSC测定的吸热最大峰值温度)
249℃
·分子量(TOF-质谱分析)
760.9
·1H-NMR(溶剂:DMSO)
图1-a和图1-b表示1H-NMR质谱。
[制造例2]化合物No.12的六氟化磷盐的制造
(中间体的合成)
在高压釜中加入18.7g上述制造例1得到的吲哚衍生物、10.7g的碘化甲烷、38g甲醇,在100℃下反应12小时。使其后脱溶剂得到的残渣在5.0g乙醇中加热溶解,在该溶液中加入50g醋酸丁酯并析出晶体。过滤晶体,在80℃下真空干燥2小时,得到5.5g(收率21.9%)的黄色晶体的中间体。
(花青化合物的合成)
在反应烧瓶中加入2.52g上述得到的中间体、2.49g下式所示的中间体B、1.53g醋酸酐、7.91g吡啶,在50℃下反应4小时。在其中加入16g氯仿和1.65g六氟化磷钾溶于20g水后而形成的溶液,在室温下搅拌30分钟,除去水相。在其中加入将0.7g六氟化磷钾溶于15g水后而形成的溶液,在室温下搅拌30分钟,除去水相,再加入将0.7g六氟化磷钾溶于15g水后而形成的溶液,在室温下搅拌30分钟,除去水相。对所得的有机相,用15g水洗涤3次后,用无水硫酸钠干燥,脱溶剂,得到油状物。一边将其加热,使15g甲醇回流,一边滴加。将系统温度降低到25℃,过滤所析出的晶体,用甲醇洗涤后,在120℃下真空干燥2小时,得到1.2g(收率31.8%)作为目标物的紫色晶体。对所得的晶体进行分析的结果是,该晶体确定为作为目标物的化合物No.12的六氟化磷盐。分析结果如下所示。
中间体B
Figure A20048002170400151
分析结果
·光学特性(氯仿,3.418×10-6mol/升)
λmax:607nm、ε:1.19×105
·熔点(通过在氮气中以10℃/分钟的速度升温下的DSC测定的吸热最大峰值温度)
231℃
·分子量(TOF-质谱分析)
754.8
·1H-NMR(溶剂:重氢氯仿)
图2-a~图2-c表示1H-NMR质谱。
[制造例3]化合物No.19的六氟化磷盐的制造
(中间体的合成)
在反应烧瓶中加入16.2g由缩合N-甲基-N(4-氯代苯基)肼和4-苯基丁烷-2-酮所得到的下式的起始物质、13.4g的苄基溴、26.5g乙醇,在75℃下反应14小时。在其中加入60g乙酸乙酯,回流30分钟。过滤析出的晶体,用乙酸乙酯洗涤后,在80℃下真空干燥2小时,得到19.0g(收率71.8%)的白色晶体的中间体。
Figure A20048002170400161
(花青化合物的合成)
在反应烧瓶中加入6.92g上述得到的中间体、1.54g的N,N’-二苯基脒、2.40g醋酸酐、12.42g吡啶,在78℃下反应4小时。在其中加入将25g氯仿和4.33g六氟化磷钾溶于50g水后而形成的溶液,在室温下搅拌30分钟,除去水相。在其中加入将2.10g六氟化磷钾溶于25g水后而形成的溶液,在室温下搅拌30分钟,除去水相,再加入将1.1g六氟化磷钾溶于25g水后而形成的溶液,在室温下搅拌30分钟,除去水相。对于所得的有机相,用30g水洗涤3次后,用无水硫酸钠干燥,脱溶剂,得到油状物。一边将其加热,使14g甲醇回流,一边滴加。将系统温度降低到25℃,过滤析出的晶体。用甲醇洗涤所得的晶体后,在120℃下真空干燥2小时,得到2.2g(收率32.1%)作为目标物的绿色晶体。对所得的晶体进行分析的结果是,该晶体确定为作为目标物的化合物No.19的六氟化磷盐。分析结果如下所示。
分析结果
·光学特性(氯仿,3.820×10-6mol/升)
λmax:585nm、ε:1.56×105
·熔点(通过在氮气中以10℃/分钟的速度升温下的DSC测定的吸热最大峰值温度)
244℃
·分子量(TOF-质谱分析)
875.8
·1H-NMR(溶剂:DMSO)
图3-a~图3-C表示1H-NMR质谱。
[评价例]
对由上述制造例1~3得到的花青化合物和以下所示的比较化合物1~3,在氮气流中进行示差热分析,评价热分解温度。热分解温度是在氮气中在10℃/分的升温条件下由DTA的发热最高峰温度进行评价。结果示于表1中。                                                                              比较化合物3
Figure A20048002170400171
        
Figure A20048002170400173
表1
  花青化合物阳离子   花青化合物阴离子   热分解温度(℃)
  制造例1   化合物No.10   PF6 -   247.9
  制造例2   化合物No.12   PF6 -   233.5
  制造例3   化合物No.19   PF6 -   245.5
  -   比较化合物1   PF6 -   282.5
  -   比较化合物2   PF6 -   292.0
  -   比较化合物3   PF6 -   300.0
从上述的表1的结果可以确认,本发明的花青化合物的热分解温度较低。这表示本发明的花青化合物适合作为光学记录材料用于高速记录中。
[实施例1~3]光学记录介质的制造和评价
在将钛螯合剂化合物(T-50:日本曹达公司制)涂布并水解后设置了基底层(0.01μm)的直径为12厘米的聚碳酸酯圆盘基板上,通过2,2,3,3-四氟丙醇溶液(浓度2重量%)以旋涂法分别涂布由上述制造例1~3得到的花青化合物,形成厚度为100纳米的光学记录层而得到光学记录介质。对于这些光学介质,进行透射光UV光谱和入射角为5°的反射光的UV光谱的测定。结果如表2所示。
透射光光谱与光学记录介质的记录特性相关。将各光学记录介质的λmax的强度作为1,与此相对的相对强度的值低于0.15时,记录特性恶化,而超过0.50时,记录层的耐光性变差,记录的保存稳定性变差。因此,相对于记录的光波长,相对强度显示为0.15~0.50的是优选的。另外,反射光光谱与光学记录介质的再生特性相关。在再生模式下,对于使激光在光学记录介质上反射的反射光,可以通过激光波长的光量的差来检测有无记录,所以反射光的最大吸收光谱,接近所使用的再生光的波长,所以优选。
[表2]
花青化合物   透射光λmax(nm)   透射光nm(相对强度)   反射光λmax(nm)
实施例1   化合物No.10PF6 -盐(制造例1) 604 635nm(0.202) 625
实施例2   化合物No.12PF6 -盐(制造例2) 618.5 650nm(0.289),660nm(0.182) 646
实施例3   化合物No.19PF6 -盐(制造例3) 595 620nm(0.373),635nm(0.161) 621
从上述表2可以确认,使用本发明的花青化合物在基板上形成光学记录层而得到的光学记录介质对作为DVD-R规格的620nm、635nm、650nm、660nm的激光是合适的。
根据本发明,可以提供适合光学记录用途的新型花青化合物、含有该化合物的光学记录材料和光学记录介质。

Claims (5)

1.由下述通式(I)表示的花青化合物,
式中,环A和环B是可以具有取代基的苯环或萘环;R1~R4之中的相邻接的2个基团(R1和R2或R3和R4)或者全部为苄基,剩余的基团为碳原子数为1~4的烷基或相连结而形成3~6元环的基团;Y1和Y2各自独立地是碳原子数为1~30的有机基团;Anm-是m价的阴离子;m是1或2的整数;p是保持电荷为中性的系数。
2.根据权利要求1所记载的花青化合物,其中上述通式(I)的R1~R4全部为苄基。
3.根据权利要求1所记载的花青化合物,其中在上述通式(I)的A环和B环中,构成结合有相邻接的2个苄基的杂环的环A和/或环B是萘环。
4.一种在基材上形成光学记录层而得到的光学记录介质的光学记录层中使用的光学记录材料,其含有权利要求1所记载的花青化合物。
5.一种在基材上形成由权利要求1所记载的光学记录材料构成的薄膜作为光学记录层而得到的光学记录介质。
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