﻿Pratt 
  — 
  Double 
  Halides 
  of 
  Ccesium, 
  Rubidium, 
  etc. 
  397 
  

  

  Akt. 
  XXXI. 
  — 
  On 
  the 
  Double 
  Halides 
  of 
  Ccesium, 
  Rubidium, 
  

   Sodium 
  and 
  Lithium 
  with 
  Thallium 
  • 
  by 
  J. 
  H. 
  Peatt. 
  

  

  In 
  previous 
  investigations 
  upon 
  the 
  double 
  halides 
  of 
  triva- 
  

   lent 
  thallium 
  with 
  the 
  alkali 
  metals, 
  the 
  salts 
  of 
  only 
  potassium 
  

   and 
  ammonium 
  seem 
  to 
  have 
  been 
  carefully 
  studied. 
  The 
  

   only 
  caesium 
  and 
  rubidium 
  salts 
  that 
  have 
  been 
  made 
  are 
  

   Cs 
  3 
  TlCl 
  6 
  .2H 
  2 
  and 
  Eb 
  3 
  TlCl 
  6 
  . 
  2H 
  2 
  described 
  by 
  Godfrey,* 
  

   but 
  in 
  the 
  present 
  investigation 
  the 
  compounds 
  of 
  this 
  type 
  

   were 
  found 
  to 
  have 
  one 
  instead 
  of 
  two 
  molecules 
  of 
  water 
  of 
  

   crystallization. 
  

  

  The 
  present 
  research 
  has 
  been 
  carried 
  out 
  very 
  carefully 
  and 
  

   systematically 
  in 
  order 
  to 
  obtain 
  as 
  complete 
  a 
  series 
  of 
  double 
  

   salts 
  in 
  each 
  case 
  as 
  possible. 
  The 
  salts 
  that 
  have 
  been 
  made 
  

   belong 
  to 
  four 
  types, 
  corresponding 
  to 
  those 
  previously 
  made 
  

   with 
  potassium 
  and 
  ammonium, 
  and 
  are 
  as 
  follows, 
  

  

  3:1 
  

  

  Cs 
  T1C1 
  . 
  H 
  

  

  2: 
  1 
  

  

  Cs 
  2 
  TlCl 
  5 
  

   Cs 
  2 
  TlCl 
  5 
  .H 
  2 
  

  

  3: 
  2 
  

  

  Cs 
  3 
  Tl 
  2 
  Cl 
  9 
  

   OBJTl.Br. 
  

  

  1: 
  1 
  

  

  

  

  

  CsTlBr 
  

  

  

  

  CsTlI 
  4 
  

  

  Rb 
  T1C1 
  . 
  H 
  

  

  Rb 
  2 
  TlCl 
  5 
  .H 
  2 
  

  

  

  Rb 
  3 
  TlBr 
  .H 
  2 
  

  

  RbTlBr 
  . 
  H 
  

  

  

  

  RbTJI 
  4 
  .2H 
  2 
  

  

  Na 
  3 
  TlCl 
  6 
  .12H 
  2 
  

   Li.TlCL.8ELO 
  

  

  

  For 
  comparison, 
  a 
  list 
  of 
  the 
  previously 
  described 
  double 
  salts 
  

   with 
  potassium 
  and 
  ammonium 
  is 
  also 
  given. 
  

  

  3:1 
  2:1 
  3:2 
  

  

  1:1 
  

  

  K 
  3 
  T1C1 
  6 
  . 
  2H 
  2 
  K 
  2 
  T1C1 
  5 
  . 
  3H 
  2 
  K 
  3 
  T1 
  2 
  C1 
  9 
  . 
  

   (NHj/flCl 
  6 
  .2H 
  2 
  K.Tl.Br, 
  

   (NH 
  4 
  ) 
  3 
  TlCl 
  e 
  

  

  1JH 
  9 
  KTlBr 
  4 
  

   . 
  HH 
  3 
  KT1T 
  4 
  .H 
  2 
  

  

  (NH 
  4 
  )TlBr 
  4 
  .5H 
  2 
  

   (NH 
  4 
  )TlBr 
  4 
  .2H 
  2 
  

   (NH 
  4 
  )TlBr 
  4 
  

   (NH 
  4 
  )T1I 
  4 
  

  

  Several 
  points 
  of 
  interest, 
  already 
  noticed 
  in 
  connection 
  

   with 
  double 
  salts 
  prepared 
  in 
  this 
  laboratory, 
  are 
  well 
  illus- 
  

   trated 
  by 
  the 
  series 
  of 
  new 
  compounds 
  to 
  be 
  described. 
  With 
  

   caesium, 
  a 
  more 
  complete 
  series* 
  of 
  salts 
  was 
  prepared 
  than 
  

   with 
  the 
  other 
  alkali 
  metals 
  ; 
  and 
  there 
  is 
  also 
  an 
  increase 
  in 
  

   ease 
  of 
  formation 
  and 
  in 
  number 
  of 
  salts, 
  from 
  the 
  iodides 
  to 
  

   the 
  chlorides. 
  The 
  salts, 
  formed 
  from 
  the 
  alkali 
  metal 
  with 
  

  

  * 
  Landenberg's 
  Handworterbuch. 
  

  

  